c语言：求圆柱的体积

#include

double cylinder(double r,double h);

int main (void)

{

double h,r,v;

scanf("%lf%lf",&r,&h);

v=cylinder(r,h);

printf("%.3f\n",v);

return 0;

}

double cylinder(double r,double h)

{

double result;

    result=3.1415926*r*r*h;

    return result;

}