Wap ‘C’ Program to find the area of a circle

#include<stdio.h>
#include<conio.h>
void main()
{
   float r, aoc;
   printf("Enter the radius:");
   scanf("%f",&r);
   aoc = 3.14*(r*r);
   printf("area of circle is:%f",aoc);
  getch();
}

output:

Enter radius: 5
area of a circle is: 78.50