I tried to get results by e-mail but no letter was sent to mine... So I cannot understand why I have CE? I'll be very pleased for any help, because I have not idea at all...


#include <stdlib.h>
#include <stdio.h>
#include <iostream.h>
#include <math.h>

long V, a;
double K, arad;

void Load(){
     freopen("input.txt", "r", stdin);
     cin >> V >> a >>K;
     arad = a * M_PI / 180;

     fclose(stdin);
}

void Solve(){
     double S = 0, l, t;
     double SqrtK = sqrt(K);
     double Vx = V * cos(arad), Vy = V * sin(arad), g = 10;

     freopen("output.txt", "w", stdout);

     while (true){
           t = 2 * Vy / g;
           l = Vx * t;
           S += l;
           Vx /= SqrtK;
           Vy /= SqrtK;
           if (l < 0.00001) break;
     }
     printf("%.2f", S);
     fclose(stdout);
}

int main()
{
    Load();
    Solve();
    return 0;
}

'M_PI' : undeclared identifier

and comment the string
freopen("input.txt", "r", stdin);