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 time and space complexities of merge sort and when is it preferred over quick sort?

Amazon,

1077

Write a function which takes as parameters one regular expression(only ? and * are the special characters) and a string and returns whether the string matched the regular expression.

Amazon,

1094

Differentiate between a structure and a union.

Zensar,

1290

Explain that why C is procedural?

Maveric, Verifone,

1143

What is array in C

1156

write a program fibonacci series and palindrome program in c

Aditi Placement Service,

1040

What is volatile, register definition in C

Cognizant,

1105

The difference between printf and fprintf is ?

Baan Infotech,

1285

What does the file stdio.h contain?

1058

What does #pragma once mean?

Celstream,

1162

What is the ANSI C Standard?

Celstream,

1269

What's the difference between constant char *p and char * constant p?

Celstream,

1148

Why are some ANSI/ISO Standard library routines showing up as undefined, even though I've got an ANSI compiler?

Celstream,

1127

what are the advantages of a macro over a function?

TCS,

1141

what does static variable mean?

TCS,

1102

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Un-Answered Questions { C }

The % symbol has a special use in a printf statement. Explain how would you place this character as part of the output on the screen?

1210

Draw a flowchart to produce a printed list of all the students over the age of 20 in a class .The input records contains the name and age of students. Assume a sentinel value of 99 for the age field of the trailer record

5211

How many header files are in c?

1038

Explain what could possibly be the problem if a valid function name such as tolower() is being reported by the c compiler as undefined?

1009

What is the equivalent code of the following statement in WHILE LOOP format?

1303

WHAT IS THE DEFINATION OF IN TECHNOLOGY AND OFF TECHNOLOGY ?

2379

What is function prototype?

1137

What is a constant?

1061

What is printf () in c?

1086

What are different types of variables in c?

1069

What is extern keyword in c?

1130

What are volatile variables in c?

940

GIven a sequence of characters. How will you convert the lower case characters to upper case characters. ( Try using bit vector - sol given in the C lib -> typec.h)

1097

A banker has a seif with a cipher. Not to forget the cipher, he wants to write it coded as following: each digit to be replaced with the difference of 9 with the current digit. The banker chose a cipher. Decipher it knowing the cipher starts with a digit different than 9. I need to write a program that takes the cipher from the keyboard and prints the new cipher. I thought of the following: Take the input from the keyboard and put it into a string or an array. Go through the object with a for and for each digit other than the first, substract it from 9 and add it to another variable. Print the new variable. Theoretically I thought of it but I don't know much C. Could you give me any kind of hint, whether I am on the right track or not?

2047

The statement, int(*x[]) () what does in indicate?

1149

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