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C Interview Questions
Questions Answers Views Company eMail

24.what is a void pointer? 25.why arithmetic operation can’t be performed on a void pointer? 26.differentiate between const char *a; char *const a; and char const *a; 27.compare array with pointer? 28.what is a NULL pointer? 29.what does ‘segmentation violation’ mean? 30.what does ‘Bus Error’ mean? 31.Define function pointers? 32.How do you initialize function pointers? Give an example? 33.where can function pointers be used?

2 8425

34.what are bitwise shift operators? 35.what are bit fields? What is the use of bit fields in a structure declaration? 36.what is the size of an integer variable? 37.what are the files which are automatically opened when a c file is executed? 38.what is the little endian and big endian? 39.what is the use of fflush() function? 40.what is the difference between exit() and _exit() functions? 41.where does malloc() function get the memory? 42.what is the difference between malloc() and calloc() function? 43.what is the difference between postfix and prefix unary increment operators?

3 4517

44.what is the difference between strcpy() and memcpy() function? 45.what is output of the following statetment? 46.Printf(“%x”, -1<<4); ? 47.will the program compile? int i; scanf(“%d”,i); printf(“%d”,i); 48.write a string copy function routine? 49.swap two integer variables without using a third temporary variable? 50.how do you redirect stdout value from a program to a file? 51.write a program that finds the factorial of a number using recursion?

Amdocs,

6 7893

52.write a “Hello World” program in “c” without using a semicolon? 53.Give a method to count the number of ones in a 32 bit number? 54.write a program that print itself even if the source file is deleted? 55.Given an unsigned integer, find if the number is power of 2?

Datamatics, Solartis, TCS, ThinkBox, Trine,

25 47941

Given an array A[n+m] of n+m numbers, where A[1] ... A[n] is sorted and A[n+1] ... A[n+m] is sorted. Design a linear time algorithm to obtain A[1...n+m] sorted using only O(1) extra space. Time Complexity of your algorithm should be O(n) and Space Complexity O(1).

1134

What is meant by int fun const(int a, int b) { .... ... }

1 4185

How can I get Single byte from 'int' type variable? Can we alter single bit or multiple bits in int type variable? if so, How?

2 5810

Can we access RAM? How? Whats the range of access? Similarly What are other hardware we can access?

1 2726

Which command is more efficient? *(ptr+1) or ptr[1]

3 4632

Function to find the given number is a power of 2 or not?

Motorola, nvidia,

20 34664

Program to write some contents into a file using file operations with proper error messages.

2 3817

how to find that no is int or float?

5 6125

can we access one file to one directory?

1 2677

will u give me old quesrion papers for aptitude for L & t info tech?

Hindustan, L&T,

1 4560

Here is alphabets : abcdefgh 1) how to reverse. as hgfedcba 2) after reversal, how to group them in a pair hg fe dc ba.

2 4875


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Un-Answered Questions { C }

How can you tell whether a program was compiled using c versus c++?

158


What is the difference between array and structure in c?

132


What are derived data types in c?

157


Give a one-line C expression to test whether a number is a power of 2. [No loops allowed - it's a simple test.]

179


Can a pointer be static?

136






Why header file is used in c?

131


What are identifiers c?

116


What is static memory allocation?

170


Write a program to generate random numbers in c?

185


How to compare array with pointer in c?

146


how logic is used

1045


What does a pointer variable always consist of?

193


what is the differnce between programing langauge and tool? is sas is a programing langauge r tool?

1380


What are categories used for in c?

107


How is a null pointer different from a dangling pointer?

137