Write a program to find the volume of a cube, sphere, and cylinder.

#include<stdio.h>
#include<conio.h>
#define pi 3.14
void main()
{
char x;
int i=1;
float r,h;
clrscr();
while(i)
{
printf("\n\tVolume Calculator\n\nSelect option\n\n1.Sphere\n\n2.Cone\n\n3.Cylinder\n\n4.Exit\n");
x=getch();
switch(x)
{
case '1':
printf("\n\tSphere\n\nEnter radious\t: ");
scanf("%f",&r);
printf("\nTotal Volume\t: %.2f\n",pi*r*r*r*4/3);
getch();
break;
case '2':
printf("\n\tCone\n\nEnter radious\t: ");

scanf("%f",&r);
printf("\nEnter Heigth\t: ");
scanf("%f",&h);
printf("\nTotal Volume\t: %f\n",pi*r*r*h*1/3);
getch();
break;
case '3':
printf("\n\tCylinder\nEnter radious\t: ");
scanf("%f",&r);
printf("\nEnter Heigth\t: ");
scanf("%f",&h);
printf("\nTotal Volume\t: %.2f\n",pi*r*r*h*4/3);
getch();
break;
case '4':
i=0;
break;
       default :
printf("\n%d is invalid\n",x);
}
}

}