ural 1192 Ball in a Dream

 #include <cstdio>
 #include <cstring>
 #include <cmath>
 #include <algorithm>
 #define maxn 2000
 using namespace std;
 const double pi=acos(-1.0);

 int main()
 {
     double v,a,k;
     scanf("%lf%lf%lf",&v,&a,&k);
     double ans=;
     a=a*pi/;
     while()
     {
         if(v<0.01) break;
         ans+=(*v*cos(a)*v*sin(a))/10.0;
         double ek=0.5*v*v;
         ek=ek/k;
         v=sqrt(ek*2.0);
     }
     printf("%.2lf\n",ans);
     return ;
 }