> #include <stdio.h>
> #include <math.h>
> int main()
> {
> 	int a1,b1,a2,b2,a3,b3,i;
> 	char c;
> 	while (scanf("%d/%d%c%d/%d",&b1,&a1,&c,&b2,&a2)!=EOF)
> 	{
> 		a3=a1*a2;
> 		if (c=='+')
> 		{
> 			b3=a2*b1+a1*b2;
> 		}
> 		if (c=='-')
> 		{
> 			b3=a2*b1-a1*b2;
> 		}
> 		for(i=2;i<=sqrt(a3)&&i<=sqrt(fabs(b3));)
> 		{
> 			if (a3%i==0&&b3%i==0)
> 			{
> 				a3=a3/i;
> 				b3=b3/i;
> 				i=2;
> 			}
> 			else
> 				i++;
> 		}
> 		if (b3==0)
> 		{
> 			printf("0\n");
> 		}
> 		else if (b3%a3==0)
> 		{
> 			printf("%d\n",b3/a3);
> 		}
> 		else
> 		{
> 			printf("%d/%d\n",b3,a3);
> 		}
> 	}
> 	return 0; 
> }
> 

• Re:为什么答案总是错的！哪位高手帮帮忙啊！(附代码，）代码很简单，帮忙看看。 (20) 985967518 2013-06-13 20:58:32