一道C语言题，希望得到解答。

Question

Answer 1

#include <stdio.h>
#define PI 3.14
int main()
{
    double r,h;
    scanf("%lf,%lf",&r,&h);
    double C1=PI*r*2;
    double Sb=PI*r*r*4;
    double Vb=PI*r*r*h;
    printf("C1=%.2lf\n",C1);
    printf("Sb=%.2lf\n",Sb);
    printf("Vb=%.2lf\n",Vb);
   
   return 0;
}