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BUG 在哪？

Posted by Euphorbia at 2010-12-01 19:44:04 on Problem 3979

#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; 
}

Followed by:

Re:BUG 在哪？ (1467) dxpnb443 2011-05-29 06:36:30
- Re:BUG 在哪？ (20) dxpnb443 2011-05-29 06:37:55

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Content:

> #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; 
> }

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