> #include<iostream>
> #include<cmath>
> using namespace std;
> int gcd(int x, int y);
> int main()
> {
>     int a1,a2,b1,b2;
> 	char c;
> 	while(scanf("%d/%d%c%d/%d",&a1,&a2,&c,&b1,&b2)!=EOF)
> 	{
>                                                         int res,rex;
>                                                         if('+'==c)
>                                                         res=a1*b2+b1*a2;
>                                                         else
>                                                         res=a1*b2-b1*a2;
>                                                         if(res==0){
>                                                                    cout<<"0\n";
>                                                                    continue;
>                                                                    }
>                                                         rex=a2*b2;
>                                                         int temp;
>                                                         temp=gcd(res,rex);
>                                                         temp=temp>0?temp:-temp;
>                                                         cout<<res/temp<<"/"<<rex/temp<<endl;                                  
>      }
>      return 0;
> }
> int gcd(int x, int y){ 
> 	if (!x ||!y) return x > y ? x : y; 
> 	for (int t; t = x % y; x = y, y = t); 
> 	return y; 
> } 

• Re:BUG 在哪？ (20) dxpnb443 2011-05-29 06:37:55