/* 
   Program# 3 
   date : 10-12-2008
   Volume of sphere
*/

#include <stdio.h>
main(){
float r,p,c;
r=5.0;
p=3.14;
c=4.0/3.0*p*r*r;
printf("\nVolume of sphere : %.2f\n",c);
}

1. In the computation part, the real value are used (note 4.0 and 3.0). If integer value is used (4/3), then the output will be wrong. Since 4/3 produces result as 1. Because if both operands are int then result will be of type "int".