#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