C interview Questions for 2011, 2012 TCS, Infosys, IBM, Hexaware

C interview Questions: TCS, Infosis, IBM, Accenture, Hexaware...

 
•Why we use '# ' sign in C language?

It tells the pre-processor to do something. It can be used to:

include a file: #include <stdio.h>You can also use ifs to determine which parts of your code to compile. These ifs need to be based on MACRO values, not variables:

#if <expression>#define <macro>

#else

#define <macro>

#endif

Others:

#ifdef

#ifndef

#undef

#error

#pragma

Basic data types in C:

       char a character

       int a integer, in the range -32,767 to 32,767

long int a larger integer (up to +-2,147,483,647)

float a floating-point number

double a floating-point number, with more precision and perhaps greater range than float

What is Turbo C

Turbo C is an Integrated Development Environment and compiler for the C programming language from Borland. First introduced in 1987, it was noted for its integrated development environment, small size, fast compile speed, comprehensive manuals and low price.

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