UVA 573 Solution

#include <stdio.h>
int main()
{
    double h,u,d,f,climb;
    int day;
    while (scanf("%lf%lf%lf%lf",&h,&u,&d,&f)==4)
    {
        if (h==0) break;
        f=(u*f)/100;
        climb=u;
        day=1;
        while (1)
        {
            if (climb>h)
            {
                printf("success on day %d\n",day);
                break;
            }
            climb-=d;
            if (climb<0)
            {
                printf("failure on day %d\n",day);
                break;
            }
            u=u-f;
            if (u<0)
            u=0;
            climb+=u;
            day++;
        }
    }
    return 0;
}