Program to find square of a number using functions.

			#include<stdio.h>
			#include<conio.h>
			void main()
			{
			int rev(int);
			int r,a;
			clrscr();
			printf("enter any no: ");
			scanf("%d",&a);
			r=rev(a);
			printf("square is : %d",r);
			getch();
			}


			int rev(int x)
			{
			return(x*x);
			}
Output:
enter any no: 5
square is : 25