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C Interview Questions & Answers

Below we have listed all the C Interview Questions and answers. Feel free to comment on any C Interview Questions or answer by the comment feature available on the page.

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C Interview Questions & Answers

C is a high-level and general purpose programming language that is ideal for developing firmware or portable applications. Originally intended for writing system software, C was developed at Bell Labs by Dennis Ritchie for the Unix Operating System (OS) in the early 1970s. With the increasing popularity of object-oriented programming, C is being rapidly replaced as "the" programming language by C++, a superset of the C language that uses an entirely different set of programming concepts, and by Java, a language similar to but simpler than C++, that was designed for use in distributed networks.

Subcategories for C Interview Questions & Answers :-

Following are sub categories for which Interview Questions & Answers are available under C Interview Questions & Answers. Please select the appropriate sub-category:-

Arrays in C Interview Questions & Answers (18)

Branches & Loops in C Interview Questions & Answers (22)

C Basics Interview Questions & Answers (92)

Dynamic Memory Allocation in C Interview Questions & Answers (21)

File Operations in C Interview Questions & Answers (16)

Functions in C Interview Questions & Answers (59)

Operators in C Interview Questions & Answers (22)

Pointers in C Interview Questions & Answers (43)

Strings in C Interview Questions & Answers (32)

Structures in C Interview Questions & Answers (39)

Variables in C Interview Questions & Answers (38)

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Question
Rating
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When should a type cast be used?
3.6 Rating
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When should the register modifier be used? Does it really help?
3.0 Rating
View Answer
What is page thrashing?
3.6 Rating
View Answer
Write a program which accepts a filename as a command line argument and reverses the contents of the file( ie first character

becomes the last character of the file and so on)


Input: The program takes the file name whose content should be reversed.

Output: The program reverses the contents of the file.



3.2 Rating
View Answer
I want C program code for : Reverse the links of a linked list by traversing only once

Input:
The input consists of the information in each node of the linked list.

Output:
The program displays the information in the linked list after the links are reversed.

Sample Input:
Enter the information in the linked list (Enter -1 to exit): 10
20
30
40
50
-1


Sample Output:
After the links are reversed
Information in the linked list:
50
40
30
20
10




3.4 Rating
View Answer
What does it mean-

a[i]=i+i

4.8 Rating
View Answer
How can we open a image file through C program

4.4 Rating
View Answer
Output of this Programme please??

main()
{

int a[]={2,4,6,8,10};
int i;
change(a,5);
for(int i=0;i<=4;i++)
printf(" %d", a[i]);
}

change(int *b,int n)
{

int i;
for(i=0;i *(b+i) = *(b+i)+5;
}

sytaxis correct?? was asked i a test


3.8 Rating
View Answer
How do you write a C program which can calculate lines of code but not counting comments?

4.2 Rating
View Answer
main(int x).............

explaination on arguments passed thr' main

4.3 Rating
View Answer
union u1
{
int i;
char c;
}u2;
u2.i=32767;
u2.c='a';
now the i value gets replaced.
If we want to know the data that is saved in the union..internally, without knowing what values that we are using in the prog.

that is if just want to know whether a union currently holds an int or a char? If it is a combination of both int and char..we must know even that. and the memory locations at which this data is stored?


3.4 Rating
View Answer
What will be the output of the following program in UNIX OS with CC compiler and TC compiler?

int main()
{
int i=5;
printf(" %d",++i + ++i + ++i + ++i + ++i );
}
If any difference then Why it is difference?


4.4 Rating
View Answer
1.WRITE A 'C' PROGRAM TO READ THE AGE OF 100 PERSONS AND COUNT THE NUMBER OF PERSONS IN THE AGE GROUP 50 TO 60.USE FOR LOOP AND CONTINUE STATEMENTS.(10 MARKS)
2.WRITE A PROGRAM TO READ A POSITIVE INTEGER AND PRINT ITS BINARY EQUIVALENT.(10 MARKS)
3.GIVEN TWO ONE DIMENSIONAL ARRAYS A AND B WHICH ARE SORTED IN ASSCENDING ORDER.WRITE A PROGRAM TO MERGE THEM INTO A SINGLE SORTED ARRAY ,C THAT CONTAINS EVERY ITEM FROM ARRAYS A AND B,IN ASCENDING ORDER.(10 MARKS)
4.WRITE A FUNCTION IN C THAT WOULD TRAVERSE A LINEAR SINGLY LINKED LIST IN REVERSE AND WRITE OUT THE CONTENTS IN REVERSE ORDER.(10 MARKA)
5.WRITE A PROGRAM TO READ A SET OF INTEGERS AND TO SEPARATE ALL ODD AND EVEN NUMBERS .WRITE ALL EVEN NUMBERS IN ASCENDING ORDER.(10 MARKS)
6.WRITE A PROGRAM TO READ A REAL NUMBER X ANF FIND THE EVEN NUMBER NEAREST TO X.(10 MARKS)
7.WRITE A PROGRAM TO MULTIPLY TWO MATRICES OF ORDER M*N AND N*P RESPECTIVELY.(10 MARKS)
8.WRITE A PROGRAM IN'C' TO IMPLEMENT K-MAP SIMPLIFICATION TECHNIQUE.(10 MARKS)

3.1 Rating
View Answer
main()
{
int i;
clrscr();
printf("%d", &i)+1;
scanf("%d", i)-1;
}



4.3 Rating
View Answer
main(int argc, char *argv[])
{
(main && argc) ? main(argc-1, NULL) : return 0;
}


3.1 Rating
View Answer
main()
{
int i;
float *pf;
pf = (float *)&i;
*pf = 100.00;
printf("n %d", i);
}


3.1 Rating
View Answer
main()
{
int i = 0xff ;
printf("n%d", i<<2);
}


4.9 Rating
View Answer
#define SQR(x) x * x
main()
{
printf("%d", 225/SQR(15));
}


4.2 Rating
View Answer
union u
{
struct st
{
int i : 4;
int j : 4;
int k : 4;
int l;
}st;
int i;
}u;
main()
{
u.i = 100;
printf("%d, %d, %d",u.i, u.st.i, u.st.l);
}

3.0 Rating
View Answer
main()
{
int i, j, *p;
i = 25;
j = 100;
p = &i; // Address of i is assigned to pointer p
printf("%f", i/(*p) ); // i is divided by pointer p
}


3.7 Rating
View Answer

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