我的源程序如下,有什么问题啊？
#include<iostream.h>
#include<stdio.h>
void main()
{	float d,t,l,v;
	long int r,n=0;
	cin>>d>>r>>t;
	while (r>0)
	{       l=d*r*3.1415927/12/5280;
		v=l/t*3600;
		cout<<"Trip #"<<++n<<": ";
		printf("%0.2f %0.2f\n",l,v);
		cin>>d>>r>>t;
	}
}