Here’s the list of basic yet important C programming questions. Most of these questions get repeated in interviews. Go through these questions and comment if you have any problem in any one of these. We can discuss it.
- Write a C program to swap two variables without using a temporary variable.
- What is the 8 queens problem? Write a C program to solve it?
- Write a C program to print a square matrix helically.
- Write a C program to reverse a string.
- Write a C program to reverse the words in a sentence in place.
- Write a C program generate permutations.
- Write a C program for calculating the factorial of a number.
- Write a C program to calculate pow(x,n)?
- Write a C program which does wildcard pattern matching algorithm.
- How do you calculate the maximum subarray of a list of numbers?
- How to generate fibonacci numbers? How to find out if a given number is a fibonacci number or not? Write C programs to do both.
- Solve the Rat In A Maze problem using backtracking.
- What Little-Endian and Big-Endian? How can I determine whether a machine’s byte order is big-endian or little endian? How can we convert from one to another?
- Write C code to solve the Tower of Hanoi problem.
- Write C code to return a string from a function.
- Write a C program which produces its own source code as its output.
- Write a C progam to convert from decimal to any base (binary, hex, oct etc…).
- Write C code to check if an integer is a power of 2 or not in a single line?
- Write a C program to find the GCD of two numbers.
- Write code to remove duplicates in a sorted array.
- Find the maximum of three integers using the ternary operator.
- How do you initialize a pointer inside a function?
- Write C code to dynamically allocate one, two and three dimensional arrays (using malloc()).
- How would you find the size of structure without using sizeof()?
- Write a C program to multiply two matrices.
- Write a C program to check for palindromes.
- Write a C program to convert a decimal number into a binary number.
- Write C code to implement the Binary Search algorithm.
- Write code to evaluate a polynomial.
- Write code to add two polynomials.
- Write a program to add two long positive numbers (each represented by linked lists).
- How do you compare floating point numbers?
- What’s a good way to implement complex numbers in C?
- How can I display a percentage-done indication on the screen?
- Write a program to check if a given year is a leap year or not?
- Is there something we can do in C but not in C++?
- How to swap the two nibbles in a byte ?
- How to scan a string till we hit a new line using scanf()?
- Write pseudocode to compare versions (like 115.10.1 vs 115.11.5).
- How do you get the line numbers in C?
- How to fast multiply a number by 7?
- Write a simple piece of code to split a string at equal intervals.
- Is there a way to multiply matrices in lesser than o(n^3) time complexity?
- How do you find out if a machine is 32 bit or 64 bit?
- Write a program to have the output go two places at once (to the screen and to a file also).
- Write code to round numbers.
- How can we sum the digits of a given number in single statement?
- Given two strings A and B, how would you find out if the characters in B were a subset of the characters in A?
- Write a program to merge two arrays in sorted order, so that if an integer is in both the arrays, it gets added into the final array only once.
- Write a program to check if the stack grows up or down.
- How to add two numbers without using the plus operator?
- How to generate prime numbers? How to generate the next prime after a given prime?
- Write a program to print numbers from 1 to 100 without using loops.
- Write your own trim() or squeeze() function to remove the spaces from a string.
- Write your own random number generator function in C.
- Write your own sqrt() function in C.
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