菜鸟求教到底错哪了

程序代码：

#include<stdio.h>int main(){int i,n,sum1,sum2,sum3;double a;while(scanf("%d",&n)!=EOF){if(n==0) break;sum1=0;sum2=0;sum3=0;if(n!=0&&n<100)for(i=1;i<=n;i++)scanf("%lf",&a);if(a<0){sum1+=1;}else if(a==0){sum2+=1;}else if(a>0){sum3+=1;}printf("%d %d %d\n",sum1,sum2,sum3);}return 0;}