Using of variables in a Program

As we know that there are three types of variables in  C and C++ programming language, and these are..

1. Integers (.......-2,-1,0,+1,+2,..........)
2. Floating points (e.g 2.3 ,45.5)
3. Characters (e.g 's','a')

Variable Declaration:-

                                                               For Integers:-

                                                                                         int variable name;  

                                                               For Floating points:-

                                                                                          float variable name;

                                                               For Characters:-

                                                                                          char variable name;

Lets write a simple program that uses variables and prints it value on the screen.

#include<stdio.h>

#include<conio.h>

void main(void)

{

clrscr();

int num;        // "num" is the variable name we can use any name here

num=14;       //here we give value to the variable  

printf("The value of num = %d",num);     //here we print the value of the variable on the screen

getch();

}

Output:-

                   The value of num = 14

Note:-

         "//" this symbol is use to give comments in C and C++ , these comments are not the part of the program it is only written for the guidance of the reader as you can see above.