C Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

C Interview Questions

Questions Answers Views Company eMail

What is the difference between a structure and a union?

2 1189

How can you dynamically allocate memory in C?

2 1065

What are macros in C?

2 915

What is a segmentation fault?

2 959

What is the use of the sizeof operator?

2 1086

Explain the difference between fopen() and freopen().

2 987

What is the difference between calloc() and realloc()?

1 961

Explain #pragma in C.

1 779

What are dangling pointers?

1 794

What is undefined behavior?

1 814

What is the use of the restrict keyword?

1 737

What is an lvalue and an rvalue?

1 840

Can a program have multiple main() functions?

1 1022

What is the output of printf("%d", printf("Hello"));?

1 902

Why is C called a middle-level language?

1 802

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Un-Answered Questions { C }

If null and 0 are equivalent as null pointer constants, which should I use?

1306

Write a program to know whether the input number is an armstrong number.

1169

Why is structure padding done in c?

1186

List the difference between a "copy constructor" and a "assignment operator"?

1060

What is #include stdlib h?

1145

What is wild pointer in c with example?

1108

How does placing some code lines between the comment symbol help in debugging the code?

1058

Write a program to print factorial of given number using recursion?

1059

What is difference between arrays and pointers?

1145

On most computers additional memory that is accessed through an adapter of feature card along with a device driver program. a) user memory b) conventional memory c) expandedmemory d) area

1161

Difference between linking and loading?

1153

Explain modulus operator.

1088

What are # preprocessor operator in c?

1166

Do pointers take up memory?

1205

Can we use any name in place of argv and argc as command line arguments?

1125

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