write a programm to calculate the area and circumfurance of a given circle in C

write a programm to calculate the area and circumfurance of a given circle.

 

#include<stdio.h>
#define pi 3.14159
void main()
{
   float r, area, circumference;
   clrscr(); /* to clear the screen */
   printf("Program to calculate area and circumference ");
   printf("of a circle for a given radius.");
   printf("\n\nPlease enter the radius in centimeters : ");
   scanf("%f", &r);
   area = pi * r * r;
   circumference = 2 * pi * r;
   printf("\nThe area of the circle = %.2f sq. cm.\n", area);
   printf("\nThe circumference of the circle = %.2f cms.\n", circumference);
   printf("\nJob over...Press any key to continue "); getch();
}