uva573 - The Snail

注意一点，蜗牛不能向下爬，所以蜗牛爬行的距离不能是负数

#include<stdio.h>
int main()
{
    double h, u, d, f, p, q;
    int k;
    while(scanf("%lf%lf%lf%lf",&h,&u,&d,&f))
    {
        if(int(h) == 0)
            break;
        q = h;
        k = 1;
        p = u/100*f;
        while(1)
        {
            h -= u;
            u -= p;
            if(u < 0)
                u = 0;
            if(h < 0)
            {
                printf("success on day %d\n",k);
                break;
            }
            h += d;
            if(h > q)
            {
                printf("failure on day %d\n",k);
                break;
            }
            k++;
        }
    }
    return 0;
}