Cal volume of Cylinder using function in C

#include 
#include 

#define PI 3.142

int main () {
   
    int radius;
    int height;
    int volume;
    int program;

printf ("Enter 2 to start and 8 to quit\t");
scanf ("%d", &program);
      
while (program !=9)
{
printf ("Press \n 1 for radius \n 3 for height \n 5 to volume \n 9 to quit:\t");
scanf ("%d", &program);

if (program==1) {
printf ("Enter the value in radius\t");
scanf ("%d", &radius);   }
   
if (program==3) {
printf ("Enter the value for height:\t");
scanf ("%d", &height);   }
   
if (program==5) {
volume = PI * radius * radius * height;
printf ("\n VOLUME OF CYLINDER WITH RADIUS %dUNITS: & HEIGHT %dUNITS: IS %d CUBIC UNITS\n", radius, height, volume);          
printf ("\n Do you wish to calculate the Volume of another Cylinder?\n");           }
}   
   system ("pause");
   return 0;
}