Top 50 Mostly Asked C Interview Questions and Answers

C Interview Questions and Answers: An Overview

Are you preparing for a C interview? Feeling excited but quite nervous at the same time? fear not..! This comprehensive guide is here to guide you to demonstrate a solid grasp of C concepts, help you to grow your problem-solving skills, and also make you feel confident to ace your interview.

Why are C Interview Questions Important?

In the Programming world, C remains a foundational language for systems programming, embedded systems, and performance-critical applications. By understanding its complexities, you will conquer half of the programming languages that exist. Interviewers often use C-specific terms to analyze the understanding of your C knowledge such as

1. Memory management: C gives you direct control over memory, which can be powerful and challenging. Be prepared to explain concepts like pointers, dynamic allocation, and common memory-related pitfalls.
2. Problem-solving and algorithmic thinking: Interviewers want to see how you approach problems analytically, break them down into manageable steps, and write efficient C code to achieve the desired outcome.
3. Best practices and coding style: Following good practices demonstrates your professionalism and attention to detail. Be familiar with common C conventions, coding guidelines, and readability tips.

C Interview Questions: A Roadmap to Success

Now that you have a solid understanding of why C interview questions and how to prepare for them, let's see some advanced terms you might encounter in an interview. This guide covers various categories:

1. Basics and Syntax: Test your understanding of fundamental C concepts, data types, operators, and control flow.
2. Memory Management: Master pointers, dynamic allocation, and memory-related pitfalls.
3. Data Structures and Algorithms: Explore common C data structures (arrays, linked lists, stacks, queues, trees, etc.) and demonstrate your ability to implement algorithms using them.
4. Advanced Concepts: Get comfortable with preprocessor directives, bitwise operations, unions, structures, and advanced function pointers.
5. Problem Solving and Coding: Apply your knowledge to solve real-world programming challenges using efficient and well-structured C code.

Keep in mind for a good communicative interview Sometimes be in the interviewer's shoes too, Don't just answer, ask! Show your genuine interest by crafting insightful questions about the company, role, and team.

Explore the depth of C programming with our comprehensive guide to 50 C Interview Questions and Answers. Whether you're a beginner or an experienced developer, this resource provides valuable insights, helping you master essential concepts and excel in C-related interviews.

C Interview Questions and Answers for Freshers

1. Why is C called a mid-level programming language?

C possesses features of both lower-level and higher-level, or assembly-level, languages. C is hence frequently referred to be a middle-level language. One may write both a menu-driven consumer billing system and an operating system in C.

2. What are the features of the C language?

• Middle-level language: Provides low-level memory access and high-level abstractions, balancing efficiency and ease of use.
• Portability: Code written in C can run on different platforms with minimal modifications.
• Efficiency: Offers efficient memory management and execution speed.
• Roch Standard Library: Provides a comprehensive set of functions for various tasks.
• Procedural Language: Follows a structured, step-by-step approach to solving problems.

3. What is a token?

Tokens are the discrete components of a program. There are 6 tokens in C language, those are-

1. Identifiers
2. Keywords
3. Constants
4. Operators
5.  Special Characters
6. Strings

4. What is the use of printf() and scanf() functions? Also, explain format specifiers?

Printf()- To print the output to the screen, use print().

Scanf()- To read formatted data from the keyboard, use scanf().

The following are a few datatype format specifiers that can be used for scanning and printing:

• %d- It's a format specifier for datatypes that prints and scans integer values.
• %s- This datatype format specifier is used to print and scan strings in the program.
• %c- It is a format specifier for a datatype that is used to display and scan character values.
• %f- The float value may be seen and scanned using the datatype format specifier %f.

5. What's the value of the expression 5["zyzuv"]?

The answer is "f". In C-style languages, the expression 5["zyzuv"] is equivalent to "zyzuv"[5], which accesses the 6th character of the string "zyzuv". Therefore, the value of the expression is "v".

6. What are basic data types supported in the C Programming Language?

In C programming, basic data types include:

• Primitive Data type- There are two other categories of primitive data types: integer and floating.
• User-Defined data types- The user defines these data types to improve program readability.
• Derived data types- Data types that come from pre-built or basic data types.

7. What is a built-in function in C?

The built-in C functions scanf(), printf(), strcpy, strlwr, strcmp, strlen, strcat, and many more are used often.

The term "built-function" refers to library functions that the system provides to developers to help them with specific frequently performed predefined tasks, hence simplifying their lives. For instance, printf() in C is used when you need to print your program's output to the terminal.

8. What do you mean by the scope of the variable?

In programming languages, scope refers to the block or region where a specified variable will live; if the variable extends outside of that block or region, it will be immediately destroyed. Every variable has a certain range of use. To put it simply, a variable's scope is determined by how long it remains in the program. Three different places can define the variable. They are as follows:

1. Local Variables: Located within a certain block or function
2. Global Variables: Among all the functions that the program does globally.
3. Formal parameters:These are limited to in-function parameters.

9. What is a Preprocessor?

A software application known as a preprocessor is used to handle source files before submitting them to be built. The preprocessor allows for the inclusion of header files, macro expansions, conditional compilation, and line control.

10. What are preprocessor directives in C?

Preprocessor directives in C are built-in predefined functions or macros that are performed before program execution and serve as instructions to the compiler. The process of creating and running a C program involves several phases. Macros, File Inclusion, Conditional Compilation, and Other directives like #undef, #pragma, etc. are the main categories of Preprocessor Directives.

11. What is the use of static variables in C?

In the C programming language, data values are preserved across function calls even after they have exited their scope thanks to the usage of static variables. Static variables don't require initialization each time they are used in a program; their values are preserved inside their scope. Without initialization, the initial value of a static variable is set to 0.

// C program to print initial 
// value of static variable 
#include <stdio.h> 
int main() 
{ 
static int var; 
 int x; 
 printf("Initial value of static variable %d\n", var); 
 printf("Initial value of variable without static %d", 
 x); 
 return 0; 
}

12. What is the difference between malloc() and calloc() in the C programming language?

The library methods malloc() and calloc() are used to allocate dynamic memory. The memory that is allocated from the heap section while the program is running is known as dynamic memory. The header file "stdlib.h" is what makes dynamic memory allocation in the C programming language possible.

13. What is Recursion in C?

Recursion in C is a programming technique where a function calls itself directly or indirectly to solve a problem. In recursive functions, the function breaks down the problem into smaller subproblems and calls itself with modified arguments until a base case is reached, stopping the recursive calls.

Syntax of recursive function in the C Compiler

void do_recursion()
{ 
... .. ... 
do_recursion();
... .. ...]
} 
int main() 
{
... .. ...
do_recursion();
... .. ...
}

14. What is the difference between the Local and Global Variables in C?

15. What is a Pointer in C?

A pointer in C is a variable that holds the memory address of another variable. It allows direct manipulation of memory locations, enabling dynamic memory allocation, efficient array handling, and indirect access to data. Pointers are a fundamental feature used for tasks like data structures and dynamic memory management.

16. Define Loops in C language. What are the types of loops in C?

Loops in C are programming constructs that repeatedly execute a block of code as long as a specified condition is true. They enable efficient iteration through data, simplifying tasks like array manipulation or repetitive operations, ensuring code efficiency and maintainability. Common loop types in C include for, while, and do-while.

17. How can we create an Infinite loop in C?

Let's see how we create infinite loop in C

// C program for infinite loop 
// using for, while, do-while 
#include 
// Driver code 
int main() 
{ 
 for (;;) { 
 printf("Infinite-loop\n"); 
 } 
 while (1) { 
 printf("Infinite-loop\n"); 
 } 
 do { 
 printf("Infinite-loop\n"); 
 } while (1); 
 return 0; 
}

18. What is the Pointer to Pointer in C?

In C, a pointer to a pointer, also known as a double pointer, is a variable that holds the address of another pointer variable. It allows indirect access to a memory location, providing a way to modify pointers and dynamically allocate multi-dimensional arrays, enhancing flexibility in memory management and data structures.

int **p; // pointer to a pointer which is pointing to an integer

19. What is Typecasting in C?

Typecasting in C is the process of converting one data type into another. It allows a variable to be treated as a different type temporarily. For example, converting an integer to a float or a pointer from one data type to another is done using typecasting operators like (float) or (int*).

Syntax

(data_type)expression;

Example

int x;
for(x=97; x<=122; x++)
{
 printf("%c", (char)x); /*Explicit casting from int to char*/
}

Explanation

The given C code in the C Online Compiler initializes an integer variable x with the value 97 and then uses a for loop to print the characters corresponding to ASCII values from 97 to 122. In the ASCII table, these values represent lowercase English letters from 'a' to 'z'.

Output

abcdefghijklmnopqrstuvwxyz

20. What is the Difference between Type Casting and Type Conversion?

C Programming Interview Questions for Intermediates

21. What are header files in C and their uses?

In C programming, header files are files containing function declarations and macro definitions. They allow code reuse by providing function prototypes to other source files. Commonly used header files include <stdio.h> for input/output functions and <stdlib.h> for memory allocation functions.

Header files in C serve several purposes:

22. What is the difference between macro and functions?

A pre-processor command that designates a group of C statements is called a macro. The pre-processor directive defines a macro. Since macros are preprocessed, our program would not have been compiled until after all of the macros had been preprocessed. Functions are compiled rather than preprocessed, though.

23. Specify different types of decision control statements in C

A program executes each sentence one at a time, starting at the top and working down. Depending on the circumstance, control statements are used to execute or move control from one area of the program to another. The different types of control statements are:

• Simple if statement
• if...else statement
• if else...if ladder
• nested if...else statement
• Switch statement.

24. How to convert a String to Numbers in C?

There are two primary techniques in C for converting strings to numbers: string streams and the stoi() and atoi() library functions.

sscanf()-

atoi()-

25. What are Reserved Keywords in C?

In a program, each keyword is designed to carry out a certain function. They cannot be used for reasons other than those for which they were designed since their meaning has already been established. The programming language C has 32 keywords supported. Reserved keywords include things like auto, else, if, long, int, switch, typedef, and so on.

26. What is a Structure in C?

// C Program to show the 
// use of structure 
#include 
#include 
// Structure student declared 
struct student { 
 char name[20]; 
 int roll_no; 
 char address[50]; 
 char branch[50]; 
}; 
// Driver code 
int main() 
{ 
 struct student obj; 
 strcpy(obj.name, "Urmi_Bose"); 
 obj.roll_no = 19; 
 strcpy(obj.address, "Kolkata"); 
 strcpy(obj.branch, "Computer Science And Engineering"); 
 // Accessing members of student obj 
 printf("Name: %s\n", obj.name); 
 printf("Roll_No: %d \n", obj.roll_no); 
 printf("Address: %s\n", obj.address); 
 printf("Branch: %s", obj.branch); 

 return 0; 
}

Explanation

Output

Name: Urmi_Bose
Roll_No: 19 
Address: Kolkata
Branch: Computer Science And Engineering

27. What is Union in C?

In C, a union is a user-defined data type that allows different data types to be stored in the same memory location. Unlike structures, unions use the same memory space for all members, allowing only one member to hold a value at any given time. Unions are often used to save memory when different data types need to share the same memory location.

Syntax

union name_of_union
{
 data_type name;
 data_type name;
};

28. What is an r-value and l-value?

Example

int val = 20;Here, val is the ‘l-value’, and 20 is the ‘r-value’.

29. What is the Call by value in C?

30. What is the Call by reference in C?

Call by reference in C involves passing the memory address of a variable to a function, allowing the function to modify the actual value at that address. Changes made to the parameter inside the function are reflected outside the function, as the function operates on the original data in memory.

31. What is the difference between Call by Value and Call by Reference in C?

Certainly, here are the differences between call by value and call by reference in C:

32. What are the Enumerations in C?

In C, enumerations (enums) are user-defined data types that consist of a set of named integer constants. Enums provide a way to create symbolic names (enumerators) for integral values, making code more readable and understandable. Enums are often used to define sets of related integer values with meaningful names.

Syntax

enum enumeration_name{constant1, constant2, ... };

Example

include 
// Enum declaration
enum Days {
 SUNDAY,
 MONDAY,
 TUESDAY,
 WEDNESDAY,
 THURSDAY,
 FRIDAY,
 SATURDAY
};
int main() {
 // Enum variable declaration
 enum Days today;
 
 // Assigning a value to the enum variable
 today = WEDNESDAY;
 
 // Printing the value of the enum variable
 printf("Today is: ");
 
 // Switch case to determine the day
 switch (today) {
 case SUNDAY:
 printf("Sunday");
 break;
 case MONDAY:
 printf("Monday");
 break;
 case TUESDAY:
 printf("Tuesday");
 break;
 case WEDNESDAY:
 printf("Wednesday");
 break;
 case THURSDAY:
 printf("Thursday");
 break;
 case FRIDAY:
 printf("Friday");
 break;
 case SATURDAY:
 printf("Saturday");
 break;
 default:
 printf("Invalid day");
 break;
 }
 
 return 0;
}

Explanation

In this code in the C Online Editor, an enumeration Days is defined with the days of the week. The program sets the today variable to WEDNESDAY and prints the corresponding day using a switch statement.

Output

Today is: Wednesday

33. Write a C program to print the Fibonacci series using recursion and without using recursion.

// C program to print Fibonacci Series 
// with recursion and without recursion 
#include 
// Recursive Function to print 
// Fibonacci Series 
void Fibonacci(int num, int first, int second, int third) 
{ 
 if (num > 0) { 
 third = first + second; 
 first = second; 
 second = third; 
 printf("%d ", third); 
 // Recursive call for it's 
 // n-1 value 
 Fibonacci(num - 1, first, second, third) 
 } 
} 
// Driver code 
int main() 
{ 
 int num; 

 printf("Please Enter number of Elements: "); 
 scanf("%d", &num); 

 printf( 
 "Fibonacci Series with the help of Recursion:\n"); 

 printf("%d %d ", 0, 1); 

 // we are passing n-2 because we have 
 // already printed 2 numbers i.e, 0 and 1 

 Fibonacci(num - 2, 0, 1, 0); 

 printf("\nFibonacci Series without Using Recursion:\n"); 

 int first = 0, second = 1, third = 0; 

 printf("%d %d ", 0, 1); 

 // Loop will start from 2 because we have 
 // already printed 0 and 1 
 for (int i = 2; i < num; i++) { 
 third = first + second; 

 printf("%d ", third); 

 first = second; 
 second = third; 
 } 

 return 0; 
}

Output

Please Enter number of Elements: 5
Fibonacci Series with the help of Recursion:
0 1 1 2 3 
Fibonacci Series without Using Recursion:
0 1 1 2 3

34. What is the difference between Struct and Union in C?

Example (Struct):

  struct Point {
 int x;
 int y;
};
struct Point p1;
p1.x = 1;
p1.y = 2;

Example (Union):

  union Data {
 int i;
 float f;
 char c;
};
union Data d;
d.i = 10;
printf("%d", d.i); // Output: 10
d.f = 3.14;
printf("%f", d.f); // Output: 3.140000

35. What are Static Memory Allocation and Dynamic Memory Allocation in C?

Static memory allocation- Static memory allocation is the type of memory allocation that occurs during compilation. Allocating static memory reduces operating time. Because memory is allocated from the stack, it is quicker than dynamic memory allocation. Compared to dynamic memory allocation, this form of memory allocation is less effective. Within the array, it is mostly favored.

Dynamic memory allocation- Dynamic memory allocation is the process of allocating memory during runtime or execution. Because dynamic memory allocation uses the heap for memory allocation, it is slower than static memory allocation. When compared to static memory allocation, this form of memory allocation is more efficient. Most people in the linked list favor it.

C Interview Questions and Answers for Experienced

36. What is a Memory Leak? How to avoid it?

Depending on the size of the data type, assigning a variable requires space in either our heap or RAM. Nevertheless, if a programmer uses heap memory and forgets to delta it, eventually all of the RAM's memory will be used up and there won't be any more memory, which could result in a memory leak.

int main()
{
 char * ptr = malloc(sizeof(int)); 
 /* Do some work */
 /*Not freeing the allocated memory*/
 return 0;
}

You can track every memory allocation you make, plan to the point where you wish to destroy (in a good sense) that memory, and then remove it there to prevent memory leaks. Using the C++ smart pointer in C to connect it to GNU compilers is an additional method.

37. What is typedef?

typedef in C is used to create custom data type aliases. It allows programmers to define names for existing data types, making the code more readable and adaptable. Custom types created with typedef can simplify complex declarations and enhance code clarity.

typedef <existing-type> <new-type-identifiers>;

An alias name for the current complex type definition is provided by typedef. You may easily make an alias for any type with typedef. Typedef will let you write shorter code, whether you're declaring a sophisticated function pointer, structure, or simple integer.

38. Write a C program to check whether a number is prime or not.

// C program to check if a 
// number is prime 
#include 
#include 
// Driver code 
int main() 
{ 
 int num; 
 int check = 1; 
 printf("Enter a number: \n"); 
 scanf("%d", &num); 
 // Iterating from 2 to sqrt(num) 
 for (int i = 2; i <= sqrt(num); i++) { 
 // If the given number is divisible by 
 // any number between 2 and n/2 then 
 // the given number is not a prime number 
 if (num % i == 0) { 
 check = 0; 
 break; 
 } 
 } 
 if (num <= 1) { 
 check = 0; 
 } 
 if (check == 1) { 
 printf("%d is a prime number", num); 
 } 
 else { 
 printf("%d is not a prime number", num); 
 } 
 return 0; 
}

Explanation

This C program checks whether a given number is prime or not. It takes an input number, iterates from 2 to the square root of the input, and checks for divisibility. If the number is divisible by any value in this range, it's not prime. If it's less than or equal to 1, it's not prime either. The result is displayed accordingly.

39. How is Source Code different from Object Code?

40. What is Pass-by-Reference in functions?

A function that uses pass-by-reference can change a variable without copying it. Since the provided parameter and variable share the same memory address, any modifications made to the argument will also affect the variables.

Example

// C program to change a variable 
// using pass by reference 
#include 
// * used to dereference the variable 
void change(int* num) 
{ 
 // value of num changed to 34 
 *num = 34; 
} 
// Driver code 
int main() 
{ 
 int num = 12; 
 printf("Value of num before passing is: %d\n", num); 
 // Calling change function by passing address 
 change(&num); 
 printf("Value of num after changing with the help of "
 "function is: %d", 
 num); 
 return 0; 
}

Explanation

In this code, the change function takes a pointer to an integer as a parameter and modifies the value stored at that memory location. The address of the num variable is passed to the change function using the & operator. As a result, the value of num inside the main function is changed to 34.

Output

Value of num before passing is: 12Value of num after changing with the help of function is: 34

41. What is an auto keyword?

In the C programming language, each local variable in a function is referred to as an automatic variable. For every variable declared inside a function or block, the default storage class is Auto. Access to auto variables is restricted to the block or function in which they have been defined. With the aid of pointers, we may use them outside of their intended usage. Auto keywords by default have a garbage value.

42. Write a program to print “Hello-World” without using a semicolon.

// C program to print hello-world 
// without using semicolon 
#include 
// Driver code 
int main() 
{ 
 // This will print the hello-world 
 // on the screen without giving any error 
 if (printf(“Hello - World”)) { 
 } 
 return 0; 
}

Explanation

This code uses the printf function inside the if statement condition. The printf function returns the number of characters printed. Since the string "Hello - World" has a non-zero length, the condition evaluates to true and the empty block { } under if is executed, leading to the printing of "Hello - World".

Output

Hello - World

43. Explain Modifiers in C

In the C language, modifiers are keywords that are used to alter the meaning of fundamental data types. They outline how much memory should be set aside for the variable. There are five types of modifiers, which are

1. long
2. short
3. signed
4. unsinged
5. long long

44. Write a program to print the factorial of a given number with the help of recursion.

// C program to find factorial 
// of a given number 
#include <stdio.h> // Function to find factorial of 
// a given number 
unsigned int factorial(unsigned int n) 
{ 
if (n == 0) 
 return 1; 
return n * factorial(n - 1); 
} // Driver code 
int main() 
{ 
 int num = 5; 
 printf("Factorial of %d is %d", num, factorial(num)); 
 return 0; 
}

Explanation

This C program calculates the factorial of a given number using recursion. The factorial function recursively calculates the factorial: n! = n * (n-1)!. In the main function, the program calculates the factorial of 5. The program computes 5! Which is equal to 5 * 4 * 3 * 2 * 1 = 120, and prints the result.

Output

Factorial of 5 is 120

45. What is the difference between #include "..." and #include <...>?

In C programming, both #include "..." and #include <...> are used to include header files, but they differ in their search paths and usage:

#include "..." (Double Quotes): The C preprocessor searches the predefined list of system directories for the filename before checking user-specified directories (directories can be added to the predefined list by using the -I option).

#include <...> (Angle Brackets): The preprocessor follows the search path given for the #include <filename> form after first searching in the same directory as the file containing the directive. Include programmer-defined header files using this way.

Using double quotes ("...") is generally preferred for including project-specific headers, while angle brackets (<...>) are used for standard library or system headers to distinguish between user-defined and system-provided header files.

46. Write a program to check an Armstrong number.

// C program to determine whether 
// the given number is Armstrong 
// or not 
#include 
// Driver code 
int main() 
{ 
 int n; 
 printf("Enter Number \n"); 
 scanf("%d", &n); 
 int var = n; 
 int sum = 0; 
 // Loop to calculate the order of 
 // the given number 
 while (n > 0) { 
 int rem = n % 10; 
 sum = (sum) + (rem * rem * rem); 
 n = n / 10; 
 } 

 // If the order of the number will be 
 // equal to the number then it is 
 // Armstrong number. 
 if (var == sum) { 
 printf("%d is an Armstrong number \n", var); 
 } 
 else { 
 printf("%d is not an Armstrong number", var); 
 } 
 return 0; 
}

Explanation

This C program checks if a given number is an Armstrong number or not. It calculates the sum of cubes of its digits and compares it with the original number. If they are equal, it's an Armstrong number. 1^3 + 5^3 + 3^3 = 153, which matches the original number.

Output

153 is an Armstrong number

47. Merge two sorted Linked Lists in C

include <stdio.h>
#include <stdlib.h>
// Node structure representing a node in the linked list
struct Node {
 int data;
 struct Node* next;
};
// Function to merge two sorted linked lists
struct Node* mergeSortedLists(struct Node* list1, struct Node* list2) {
 if (list1 == NULL) return list2;
 if (list2 == NULL) return list1;
 if (list1->data < list2->data) {
 list1->next = mergeSortedLists(list1->next, list2);
 return list1;
} else {
 list2->next = mergeSortedLists(list1, list2->next);
 return list2;
}
}
// Function to create a new node with given data
struct Node* createNode(int data) {
struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->data = data;
 newNode->next = NULL;
 return newNode;
}
// Function to print the merged linked list
void printList(struct Node* node) {
 while (node != NULL) {
 printf("%d ", node->data);
 node = node->next;
}
 printf("\n");
}
// Driver code
int main() {
 struct Node* list1 = createNode(1);
 list1->next = createNode(3);
 list1->next->next = createNode(5);
 struct Node* list2 = createNode(2);
 list2->next = createNode(4);
 list2->next->next = createNode(6); printf("First sorted linked list: ");
printList(list1); printf("Second sorted linked list: ");
printList(list2); struct Node* mergedList = mergeSortedLists(list1, list2);
 printf("Merged sorted linked list: ");
 printList(mergedList); return 0;
}

Explanation

In this program, two sorted linked lists (list1 and list2) are merged into a new sorted linked list (mergedList). The merged list is then printed.

Output

First sorted linked list: 1 3 5 
Second sorted linked list: 2 4 6 
Merged sorted linked list: 1 2 3 4 5 6 

48. What is the use of an extern storage specifier?

In the C language, the extern keyword is used to increase the visibility of C variables and functions. External can be shortened to extern. When a specific file wants to access a variable from any other file, it is used. Variables containing the extern keyword are simply declared, not defined, which increases duplication. There is no need to declare or create extern functions because they are visible by default throughout the program.

49. What is the difference between getc(), getchar(), getch() and getche() in C?

1. getc():
   • Reads a character from the specified file stream (e.g., stdin, file).
   • Requires stdio.h header.
   • Offers flexibility for reading from different input sources.
2. getchar():
   • Reads a character from the standard input stream (stdin).
   • Requires stdio.h header.
   • Commonly used for simple character input from the keyboard.
3. getch():
   • Reads a character from the keyboard without echoing it to the screen.
   • Typically used in older MS-DOS and Windows environments.
   • Requires conio.h header (non-standard and not portable).
4. getche():
   • Reads a character from the keyboard and echoes it to the screen.
   • Similar to getch(), but it displays the input character.
   • Requires conio.h header (non-standard and not portable).

Note: getch() and getche() are not standard C functions and are not recommended for portable and modern C programming. Prefer using getc() or getchar() for standard and portable input operations.

50. How is import in Java different from #include in C?

Import is a keyword, but #include is a statement processed by pre-processor software. #include increases in the size of the code.  

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Conclusion

In conclusion, mastering these top 50 C language interview questions is pivotal for aspiring programmers. These insights into fundamental concepts, data structures, and algorithms equip candidates with the knowledge needed to succeed in technical interviews. Practice, understanding, and confidence in these areas will undoubtedly pave the way to a successful C programming career. You can also consider doing our C programming tutorial from ScholarHat to upskill your career.