## C Interview Questions and Answers - 15 Minutes - Free - Live Webinar

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# C Interview Questions and Answers

## 1. Pick out the odd one out of the following malloc() ,calloc() ,free() ,realloc() ?

**Answer :**free()..

## 2. What is the main difference between c and c++ ?

**Answer :**The main difference between c and c++ is...

## 3. Find the output of C Program ?

main() { int x=20,y=35; x = y++ + x++; y = ++y + ++x; printf("%d %d\n",x,y); } ?

**Answer :**While calculating the y value, x & y values are preincremtned, so x & y values are incremented...

## 4. What is the output ?

**Answer :**NULL...

## 5 . How to convert hexadecimal to binary using c language ?

**Answer :**To convert hexadecimal to binary using c language...

## 7. Difference between data structure and data base ?

**Answer :**Data Structure is about storing data...

## 8. Pattern programs in C ?

**Answer :**Pattern programs in C print various patterns of numbers and stars...

## 9. Write a program without using library functions ?

**Answer :**C Standard library functions are inbuilt functions in C programming...

## 10. Explain Call by Value in C language ?

**Answer :**In call by value, original value is not modified...

## 11. Explain Call by Reference in C language ?

**Answer :**In call by reference, original value is modified...

## 12. Write a C Program to Copy One String into Other Without Using Library Function ?

**Answer :**Copy String Manually Without Using strcpy()...

## 13. How to find LCM of two Numbers in C ?

**Answer :**The LCM of two numbers a and b is the smallest positive integer that is perfectly divisible...

## 14. How to check wheather the number is Palindrome or not in C ?

**Answer :**If we reverse a numbers, the number remains the same it is said to be the palindrome number...

## 15. How to check a Number is Prime or not in C ?

**Answer :**A Prime Number can be divided only by 1, or itself...

## 16. How to write a Fibonacci Series program in C ?

**Answer :**The Fibonacci sequence is a set of numbers that starts with a 1 or 0, followed by a 1...

## 17. How to find the Greatest Common Divisor(GCD) in C ?

**Answer :**GCD(Greatest Common Divisor) of two or more numbers, which are not all zero...

## 18. How to write a program to reverse a string in C ?

**Answer :**This program reverses a string that a user inputs...

## 19. How to check if a number is palindrome or not ?

**Answer :**If we reverse a numbers, the number remains the same...

## 20. How to find two element whose sum is closet to zero ?

**Answer :**Element whose sum is closet to zero is also called minimum absolute sum pair...

## 21. What is the output of this C code ?

A. I am 5

B. I am not 5

C. I am different

D. Error

E. None of these

**Answer : **D. Error

## 22. What is the output of this C code ?

A. We are equal.

B. I am greater.

C. I am lesser.

D. This code will generate an error.

**Answer : **D. This code will generate an error

## 23. Find the output :

A . 80

B . 40

C . 32

D . 72