/* ---------------------------------------------------------------------  
//  Figure 9.8:  A function with two parameters and a return value.
// --------------------------------------------------------------------- 
*/
#include "tools.h"

double cyl_vol( double d, double h );              /* function prototype */

/*-----------------------------------------------------------------------*/
void main( void )
{   
    double diam, height, volume;

    banner();
    printf ( "\n Enter diameter and height of cylinder: " );
    scanf ( "%lg%lg", &diam, &height );

    volume = cyl_vol( diam, height );
    printf ( "\t The volume of this cylinder = %.2f \n", volume );
    bye();
}

/*-----------------------------------------------------------------------*/
double                             /* We return the volume of a cylinder */
cyl_vol( double d, double h )      /* with diameter=d and height=h;      */
{   
    double r;                      /* r is the radius of the cylinder.   */

    r = d / 2;
    return PI * r * r * h;
}