简单的分支与循环结构 2 第一题

#include<stdio.h>
int main(void)
{
int i,n;
double r,h,v;
double cylinder(double r,double h);

printf("Enter n:");
scanf("%d",&n);

for(i=1;i<=n;i++){
printf("Enter r and h：");
scanf("%lf%lf",&r,&h);

if(r<=0||h<=0)
{
printf("输入错误，重新输入");
}
else{
v=cylinder(r,h);
printf("v=%.3f\n",v);
}
}
return 0;
}
double cylinder(double r,double h)
{
double result;

result=3.1415926*r*r*h;

return result;
}