> #include <stdio.h>
> #include<math.h>
> double power(double x,int y);
> void main()
> {
>    int n,i,z,j;
>    float x,y,r;
> 
>    scanf("%d",&n);
>    for(i=0;i<n;i++)
>    {    j=1;
>         r=0;
>        scanf("%f %f",&x,&y);
>         while((x>r)||(y>r))
>         {
>             r=sqrt(j*50*2/3.14);
> 
>             j++;
>         };
>         printf("Property %d: This property will begin eroding in year %d.\n",i+1,j-1);
>    }
>    printf("END OF OUTPUT.\n");
>    return 0;
> }
> 
你输入x=0,y=0;看看