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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. To buy an eBook containing 30,000 Interview Questions, with Answers, Click Here. View All C Interview Questions & Answers - Exam Mode / Learning Mode
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.

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Arrays in C Interview Questions & Answers (18) Exam Mode | Learning Mode

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C Basics Interview Questions & Answers (92) Exam Mode | Learning Mode

Dynamic Memory Allocation in C Interview Questions & Answers (21) Exam Mode | Learning Mode

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Strings in C Interview Questions & Answers (32) Exam Mode | Learning Mode

Structures in C Interview Questions & Answers (39) Exam Mode | Learning Mode

Variables in C Interview Questions & Answers (39) Exam Mode | Learning Mode

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main() { extern int i; i=20; printf("%d",i); }		View Answer
void main() { float a= 0.7; if (a < 0.7) printf("c"); else printf("c++"); } Output of the above program is c. Why? Whereas the same program with 0.8 instead of 0.7 gives c++ as the output? Why explain?		View Answer
Write a program to remove comment lines and blank lines from an error free c program.		View Answer
To which numbering system can the binary number 1101100100111100 be easily converted to?		View Answer
When should a type cast be used?		View Answer
main() { int i=5; printf("%d%d%d%d%d%d",i++,i--,++i,--i,i); }		View Answer
How to find size of an datatype without using sizeof operator?		View Answer
main() { char p; printf("%d %d ",sizeof(p),sizeof(p)); }		View Answer
When should the register modifier be used? Does it really help?		View Answer
#define int char main() { int i=65; printf("sizeof(i)=%d",sizeof(i)); }		View Answer
What would be the output of the following program? main() { int y=128; const int x=y; printf("%d",x); }		View Answer
Which mistakes are called as token error?		View Answer
void main() { int const * p=5; printf("%d",++(*p)); }		View Answer
#include<conio.h> main() { int x,y=2,z,a; if(x=y%2) z=2; a=2; printf("%d %d ",z,x); }		View Answer
If the following program (myprog) is run from the command line as myprog monday tuesday wednesday thursday What would be the output? main(int argc, char argv[]) { while(--argc >0) printf("%s",++argv); }		View Answer
What are the standard predefined macros ?		View Answer
According to ANSI specifications which is the correct way of declaring main() when it receives command line arguments?		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?		View Answer
main() { int i = 100; clrscr(); printf("%d", sizeof(sizeof(i))); }		View Answer
Can a file other than a .h file be included with #include ?		View Answer