Calculation of Area and Circumference of a Circle(By using Pointers)

Write a function that calculates both Area and Perimeter/ Circumference of the Circle, whose Radius is entered through the keyboard.
(Program shows the use of Call By Reference.)

#include
#include
void main()
{

int radius;
float area, perimeter;

printf("\nEnter radius of a circle:");

scanf ("%d", &radius);
areaperi (radius, &area, &perimeter);

printf("Area=%f", area);
printf("\nPerimeter=%f", perimeter);

getch();

}


areaperi(int r, float *a, float *p)

{
*a=3.14*r*r;
*p=2*3.14*r;

}