#include<iostream>
using namespace std;

char a[8] , b;
int x , y , z , w;
int up , down ,i ;

int main()
{
	while( cin >> a )
	{
		x = a[0] - '0';
		y = a[2] - '0';
		z = a[4] - '0';
		w = a[6] - '0';
		if( a[3] == '-' )
		{
			up = x * w - z * y ;
			down = y * w;
		}
		else
		{
			up = x * w + z * y ;
			down = y * w ;
		}
		
		
		if( up < 0 )
		{
			up = - up;
			for ( i = 1 ;i <= up ;i ++ )
				if ( up % i == 0 && down % i == 0)
				{
					up  /= i;
					down  /= i;
					i = 1;
				}
			if( down == 1 ) {
				cout<<up<<endl;
				continue;
		    }
			cout <<"-"<<up<<"/"<<down<<endl;
		}
		else{
			if( up == 0 ) cout<<0<<endl;
			else{
				for ( i = 1 ;i <= up ;i ++ )
				if ( up % i == 0 && down % i == 0)
				{
					up /= i;
					down /= i;
					i = 1;
				}
			    if( down == 1 ) {
				    cout<<up<<endl;
				    continue;
		        }			
				cout<<up<<"/"<<down<<endl;
			}
		}
	}
	return 0;
}

• Re:为什么会错哦，怎么会。。。 (1099) 925695531 2011-02-13 16:35:26
• 原来是这样 (1104) 925695531 2011-02-13 16:36:11