Program to find area and circumference of circle.

			#include<stdio.h>
			#include<conio.h>
			void main()
			{
			int r;
			float pi=3.14,area,ci;
			clrscr();
			printf("enter radius of circle: ");
			scanf("%d",&r);
			area=pi*r*r;
			printf("area of circle=%f ",area);
			ci=2*pi*r;
			printf("circumference=%f ",ci);
			getch();
			}
Output:
enter radius of a circle: 5
area of circle=78.000
circumference=31.4