nyoj 一个简单的数学题

http://acm.nyist.net/JudgeOnline/problem.php?pid=330

#include<stdio.h>
#include<string.h>
int vis[1000005];
int main()
{
    int t;
    int n;
    scanf("%d",&t);
    while(t--)
    {
        memset(vis,0,sizeof(vis));
        scanf("%d",&n);
        if(n==1)
        {
            printf("1\n");
            continue;
        }
        if(n==-1)
        {
            printf("-1\n");
            continue;
        }
        if(n<0)
        {
            printf("-0.");
            n=-n;
        }
        else printf("0.");
        int tt=1;
        while(tt)
        {
            tt=tt*10;
            if(vis[tt]) break;
            vis[tt]=1;
            printf("%d",tt/n);
            tt=tt%n;
            
        }
        printf("\n");
        
    }
}