> #include <iostream>
> using namespace std;
> int main (void)
> {
> 	int a,p,e,i,d,t=1;
> 	while(1){
> 	cin>>p>>e>>i>>d;
> 	if(p==-1&&e==-1&&i==-1&&d==-1)
> 		break;
> 	a=(p*6*28*33+e*19*23*33+i*2*23*28)%21252;
> 	if(a==0)a=21252;
> 	cout<<"Case "<<t<<": the next triple peak occurs in "<<a-d<<" days";
> 	t++;
> 	}
>         return 0;
> }
>  


你在最后输出的后面，少了一个endl.