帮我看看这段程序哪里错了

#include<stdio.h>
#include<windows.h>
int main()
{
      int i,j=0;
      printf("enter a number:");
      scanf("%d",&i);
      
      while(i!=-1)
      {if(i>=j)
       j=i;
       else
       {printf("enter a number:");
       scanf("%d",&i);}}
       printf("the biggest is:%d\n",j);
       system("pause");
       return 0;}
输入一个数就没反映了!