poj1552---枚举

#include <stdio.h>

#include <stdlib.h>



int main()

{

    int numList[15],th=0,i,j;

    while(scanf("%d",&numList[th++])!=EOF){

        int count=0;

        if(numList[0]==-1)

            break;

        while(scanf("%d",&numList[th])!=EOF)

        {

            if(numList[th]==0)

                break;

            ++th;

        }

        for(i=0;i<th-1;i++)

        {

            for(j=i+1;j<=th-1;j++)

            {

                if((float)numList[i]/numList[j]==0.5 || (float)numList[i]/numList[j]==2.0)

                    count++;

            }

        }

        printf("%d\n",count);

        th=0;

    }

    return 0;

}

另外附一个可读性更高的

http://www.cnblogs.com/rainydays/archive/2013/04/03/2998275.html