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 environmen...