zoj 2557 Bungee Jumping

#include<stdio.h>#include<math.h>const double G=9.81;int main(){    double k,l,s,w;    while(scanf("%lf%lf%lf%lf",&k,&l,&s,&w))    {        if(k==0&&l==0&&s==0&&w==0)break;        double e=w*G*s;        if(s>l)e-=k*(s-l)*(s-l)/2;        if(e<0)        { printf("Stuck in the air.n"); continue;        } double v=sqrt(e*2/w);        if(v>10) printf("Killed by the impact.n");        else printf("James Bond survives.n");    }        return 0;}