grr

#include <iostream>
#include <cmath>

using namespace std;

int main()
{   int a, b, c;
    int ugao1, ugao2, ugao3;
    int alfa, beta, gama;
    cout << "Unesi stranice trougla:\n"<<endl;
    cin >> a;
    cin >> b;
    cin >> c;

     if ((a >0 && b>0 && c>0) && ((a+b)>c || (a+c)>b || (c+b)>a) )
     {
        ugao1=acos((a*a+b*b-c*c)/(2*a*b));
        ugao2=acos((a*a+c*c-b*b)/(2*a*c));
        ugao3=acos((c*c+b*b-a*a)/(2*b*c));

        alfa=ugao1/(4*atan(1));
        beta=ugao2/(4*atan(1));
        gama=ugao3/(4*atan(1));
        int maxu=alfa;

        if (beta>maxu) maxu=beta;
        if (gama>maxu) maxu=gama;


     cout << "Najveci ugao sa stranicama: " << a << "," << b << " i "<< c << " je  \n" << maxu <<" stepeni "
     << maxu/60 << " minuta " << " i "
     << maxu/3600 << " sekundi." << endl; }
     else
        cout <<" Ne postoji trougao cije su duzine stranica: "<< a << b << " i " << c << endl;


    return 0;
}