TO FIND AREA AND CIRCUMFRENCE OF CIRCLE USING C LANGUAGE

//Area And Circumference of circle

#include<conio.h>
#include<stdio.h>

void main()
{
int r;
float a,c,pi=3.14;
//Enter Radius
printf("\n\nEnter Radius :");
scanf("%d",&r);
//calculating area and circumference
a=pi*r*r;
c=2*pi*r;
//Display
printf("\n\nArea :%f",a);
printf("\n\nCircumference :%f",c);

getch();
}

OUTPUT