#include<stdio.h>
#include<math.h>

void main()
{
        float radius,pie,volume;
        pie=3.1416;
        printf("Enter the radius:");
        if(scanf("%f",&radius)==1)
        {
                volume=(4/3)*pie*pow(radius,3);
                printf("The volume is    :%6.2f",volume);
        }
        else
        {
                printf("error ,enter correct value");
        }

}
==================================OUTPUT==================================

Enter the radius :2.13
The volume  is   :30.36