#include"stdio.h"
double qwe(int x,int y)
	{double sum=1.0;
if(x==y)return 1.0;
	while(1)
		{sum=sum*x;
		x--;
		if(x==y)break;
		}
return sum;
	}
double shu(int p,int q,int r,int s)
{double m=1.0,n=1.0;

if(q>r||s>p||p==q||r==s){m*=qwe(p,q);n=qwe(r,s);}
else{ if(p>r)m*=qwe(p,r);
	 else {if(p-r<0)n=qwe(r,p);}
      if(q-s>0)n*=qwe(q,s);
      else {if(s-q>0)m*=qwe(s,q);}
	}
      if((p-q)-(r-s)>0)n*=qwe(p-q,r-s);
       else {if((p-q)-(r-s)<0)m*=qwe(r-s,p-q);}

return m/n;
}

void main()
{double shu(int p,int q,int r,int s);
	int p,q,r,s,i;
double a[6];
for(i=0;i<6;i++)
	{scanf("%d%d%d%d",&p,&q,&r,&s);
	 a[i]=shu(p,q,r,s);
	}
for(i=0;i<6;i++)
printf("%.5lf\n",a[i]);

}

• 不止6个数据呀！！！ (792) zybupt2003 2005-09-17 21:56:12