area and circumference of a circle-C

#include

#include

void main()

{

   float radius, area, circum;
 
    printf("Enter radius: ");
    scanf("%f", &radius);
    area   = radius * radius * 22 / 7; /* πr² */
    circum = 2 * radius * 22 / 7;      /* 2πr */
    printf("Area = %f\nCircumference = %f\n", area, circum);

getch();

}