while中scanf ("%f %d %d",&x,&a,&b);
改为scanf ("%f %d %f",&x,&a,&b);

> #include<stdio.h>
> #define pi 3.1415927
> void main() {
> 	int a,i=0;
> 	float x,b,e,f;
> 	scanf ("%f",&x);
> 	scanf ("%d",&a);
>          scanf ("%f",&b);
> 	while (a!=0&&b!=0) {
> 		i++;
> 		e=pi*x*a/(12*5280);
> 		f=3600*e/b;
> 		printf ("Trip #%d: %.2f %.2f\n",i,e,f);
> 		
> 	    scanf ("%f %d %d",&x,&a,&b);
> 	}
> }
> 怎么会是wrong answer呢？