Write a function that calculates both Area and Perimeter/Circumference of the Circle,whose Radius is entered through the keyboard....

#include
#define PI 3.14

int circle(int r)
{
float Area = PI*(r*r);
printf("\nArea of Cirlce = %f\n",Area);
}
int Perimeter(int r)
{
float Perimeter = 2*PI*r;
printf("\nPerimeter of Circle = %f\n",Perimeter);
}
main()
{
int choice;
do
{
int radius;
printf("Press 1 for Area and 2 for Perimeter\n");
printf("Please Enter your Choice:");
scanf("%d",&choice);
switch(choice)
{
case 1:
printf("Enter the Radius for Area:");
scanf("%d",&radius);
circle(radius);
break;
case 2:
printf("Enter the Radius for Perimeter:");
scanf("%d",&radius);
Perimeter(radius);
break;
default:
printf("Please Enter valid Choice...");
}
printf("\nPress 1 to continue...\nPress Other to Exit..\n");
scanf("%d",&choice);
}while(choice==1);
printf("HEY NAUGHTY SEE YOU SOON.....\n\n");
}

*************************OR******************************************************
#include
float area(float n)
{
float pi=3.14;
return pi*n*n;
}
float circum(float a)
{
float pi=3.14;
return 2*pi*a;
}
main()
{
float radius;
printf("Enter the radius here ");
scanf("%f",&radius);
printf("area is %f and perimeter is %f\n",area(radius),circum(radius));
}