#include<stdio.h>
float diameter(int r);
float circumference(int r);
float area(int r);
 float diameter(int r){
     int dia=r*2;
  printf("diameter=%d",dia);
 }
 float circumference(int r){
     float cir=2*3.14*r;
    printf (" circumference=%.2f ", cir);
 } 
 float area(int r){
     float ar=3.14*r*r;
    printf ("area=%f",ar);
 }
int main(){
int r=10;
float diameter(r);
float circumference(r);
float area(r);
diameter(r);
circumference(r);
area(r);

return 0;
 }