//How much did the businessman lose
#include <iostream>
using namespace std;

int main()
{
	int N , M , P , C;
	int result[10];

	while(!(N==0 && M==0 && P==0 && C==0))
	{
		cin>>N>>M>>P>>C;
		if(N==0 && M==0 && P==0 && C==0)
			break;
		cout<<(-(M-P-N))<<endl; 
	}
}

• Re:这题题目没说清楚！！！按题义应该这么做才对！ (233) kric 2007-03-10 20:38:30