Interview Questions C is the most popular programming language developed by Dennis Ritchie at the Bell Laboratories in 1972 to develop the UNIX operating systems. It is a general-purpose and procedural programming language. It is faster than the languages like Java and Python. C is the most used language in top companies such as LinkedIn , Microsoft , Opera , Meta , and NASA because of its performance. To crack into these companies and other software companies, you need to master C. This interview preparation guide on C Coding Interview Questions offers a comprehensive collection of practice questions suitable for both beginners and advanced learners. List of 50 C Coding Interview Questions and Answers Here is a list of 50 C coding interview questions and answers, to fully prepare for your next interview and ace those tough coding challenges, our C programming course offers a complete guide, including mock interview questions and detailed explanations. 1. Find the largest number among the three numbers. Refer to complete article - C program to Find the Largest Number Among Three Numbers 2. Write a Program to check whether a number is prime or not. Refer to complete article - Prime Number Program in C 3. Write a C program to calculate Compound Interest. Refer to complete article - C Program For Compound Interest 4. Write a Program in C to Swap the values of two variables without using any extra variable. Refer to complete article - Swap Two Numbers Without Using Third Variable 5. Write a Program to Replace all 0’s with 1’s in a Number. 6. Write a Program to convert the binary number into a decimal number. Refer to complete article - Convert Binary to Decimal in C 7. Write a Program to check if the year is a leap year or not. Refer to complete article - Leap Year Program in C 8. Write a program to Factorial of a Number. Refer to complete article - Factorial Program in C 9. Write a Program to Check if a number is an Armstrong number or not. Refer to complete article - C Program to Check Armstrong Number 10. Write a program to Find all the roots of a quadratic equation in C. Refer to complete article - C Program for Quadratic Equation Roots 11. Write a Program to reverse a number. Refer to complete article - Reverse Number Program in C 12. Check whether a number is a palindrome. Refer to complete article - Palindrome Number Program in C 13. Write a C Program to check if two numbers are equal without using the comparison operator. 14. Write a C program to find the GCD of two numbers. Refer to complete article - GCD of Two Numbers in C 15. Write a C program to find the LCM of two numbers. Refer to complete article - LCM of Two Numbers in C 16. Write a C Program to find the Maximum and minimum of two numbers without using any loop or condition. 17. Write a Program in C to Print all natural numbers up to N without using a semi-colon. Refer to complete article - C Program to print numbers from 1 to N without using semicolon? 18. Write a Program to find the area of a circle. Refer to complete article - C Program to Find Area of Circle 19. Write a Program to create a pyramid pattern using C. Refer to complete article - C Program to Print Pyramid Pattern 20. Write a program to form Pascal Triangle using numbers. Refer to complete article - Pascal Triangle Program in C 21. Write a Program to return the nth row of Pascal's triangle. 22. Write a program to reverse an Array. Refer to complete article - Reverse Array in C 23. Write a program to check the repeating elements in C. 24. Write a Program to print the Maximum and Minimum elements in an array. Refer to complete article - C Program to Find the Maximum and Minimum Element in the Array 25. Write a Program for the cyclic rotation of an array to k positions. Refer to complete article - C Program for Program for array rotation 26. Write a Program to sort First half in Ascending order and the Second in Descending order. 27. Write a Program to print sums of all subsets in an array. 28. Write a Program to Find if there is any subarray with a sum equal to 0. 29. Write a C program to Implement Kadane's Algorithm 30. Write a Program to find the transpose of a matrix. Refer to complete article - Transpose of a Matrix in C 31. Write a Program to Rotate a matrix by 90 degrees in the clockwise direction in C. Refer to complete article - Rotate an Image 90 Degree Clockwise 32. Write a Program to find the Spiral Traversal of a Matrix in C. 33. Write a program to count the sum of numbers in a string.

34. Program to calculate the length of the string. Refer to complete article - C Program to Find the Length of a String 35. Write a program to check string is a palindrome. Refer to complete article - C Program to Check for Palindrome String 36. Write a program to print all permutations of a given string in lexicographically sorted order in C. 37. Write a program to calculate the Power of a Number using Recursion in C. 38. Write a Code to print the Fibonacci series using recursion. Refer to complete article - C Program to Print Fibonacci Series 39. Write a Program to find the HCF of two Numbers using Recursion. 40. Write a Program in C to reverse a string using recursion. Refer to complete article - C Program to Reverse a String Using Recursion 41. Write a C Program to search elements in an array. Refer to complete article - C Program for Linear Search 42. Write a C Program to search elements in an array using Binary Search. Refer to complete article - C Program for Binary Search | GeeksforGeeks 43. Write a C Program to sort arrays using Bubble, Selection, and Insertion Sort. 44. Write a C Program to sort arrays using Merge Sort. Refer to complete article - C Program for Merge Sort 45. Write a C Program to sort arrays using Quick Sort. Refer to complete article - Quick Sort in C 46. Write a program to sort an array using pointers. Refer to complete article - C program to sort an array using pointers 47. Write a C program to Store Information about Students Using Structure Refer to complete article - C Program to Store Information of Students Using Structure 48. Write a C Program To Add Two Complex Numbers Using Structures And Functions. 49. Write a C Program to add Two Distance Given as Input in Feet and Inches Refer to complete article - C Program to Add N Distances Given in inch-feet System using Structures 50. Write a C program to reverse a linked list iteratively Refer to complete article - C Program for Reverse a linked list In this C coding interview questions and answers, we've compiled a wide-range of practice questions suitable for individuals at all levels, from beginners to advanced learners. Exploring these questions and their solutions will not only enhance your proficiency in C but also prepare you for a successful coding interview experience. Introduction 3 min read Identifiers 3 min read Keywords 3 min read Variables 4 min read Data Types 4 min read Operators 8 min read Conditional Statements 4 min read Loops 6 min read Functions 4 min read Arrays 4 min read Strings 5 min read Pointers 7 min read Function Pointer 5 min read Unions 3 min read Enumeration 4 min read Structure Alignment, Padding & Data Packing 5 min read Memory Layout 5 min read Dynamic Memory Allocation 7 min read Memory Leak 3 min read File Handling 11 min read Read/Write Structures 4 min read Error Handling 5 min read Using goto for Exception Handling in C 2 min read File Error Handling 5 min read Variadic Functions 4 min read Signals in C 4 min read Socket Programming 8 min read _Generics Keyword 3 min read Multithreading 4 min read Placement 360 Course 2 min read DSA and System Design Course 2 min read