Overloaded function!

[Coca cola]

Hi everyone, I was solving a problem of finding the biggest angle in the triangle . I first examined if there is a triangle with entered numbers and then calculated angles, found maximum and express it in degrees,minutes and seconds. But it says in line 22 that there is a mistake.(It's written that function is overloaded).In lines 23,24,25 it shows also mistakes.

#include<iostream>
#include<cmath>
using namespace std;
int main(){
    double a,b,c;
    cout<<"Enter a,b,c :";
    cin>>a>>b>>c;
    if(a>0 && b>0 && c>0 && ((a+b<c) || (c+b<a) || (a+c<b))){
    double gama=acos((a*a+b*b-c*c)/2*a*b);
    double alfa=acos((b*b+c*c-a*a)/2*b*c);
    double beta=acos((a*a+c*c-b*b)/2*a*c);
    double pi=4*atan(double(1));
    gama*=(180/pi);
    alfa*=(180/pi);
    beta*=(180/pi);
    if((alfa>beta)&&(alfa>gama))
    double max=alfa;
    else if((beta>alfa)&&(beta>gama))
    double max=beta;
    else if((gama>beta)&&(gama>alfa))
    double max=gama;
    max*=3600;
    int degrees=int(max/3600);
    int minutes=int(((max)-3600*(degrees))/60);
    int seconds=int(max-3600*seconds-60*minutes);

    cout<<"The biggest angle : "<<degrees<<" degrees"<<", "<<minutes<<"minutes"<<"i"<<seconds<<"seconds"<<endl;
    }
    else cout<<"It doesn't exist";
    return 0;
}

[grumpy]

Your code has multiple definitions of max. Change this

    if((alfa>beta)&&(alfa>gama))
    double max=alfa;
    else if((beta>alfa)&&(beta>gama))
    double max=beta;
    else if((gama>beta)&&(gama>alfa))
    double max=gama;

to

    double max;
    if((alfa>beta)&&(alfa>gama))
        max=alfa;
    else if((beta>alfa)&&(beta>gama))
        max=beta;
    else if((gama>beta)&&(gama>alfa))
        max=gama;

It also pays to learn the practice of indenting code - it makes coding problems easier to find.

If that doesn't fix your problem, rename "max" to something else. Although it is non-standard, the standard headers shipped with some compilers (notably some versions of Microsoft compilers) do declare a function named max(), so will give problems with your code. The standard specifies that the <algorithm> header supplies a templated std::max() function, and some other standard headers might #include that header (another quaint quirk of some implementations of the standard libraries).

[Elysia]

...If that doesn't fix your problem, rename "max" to something else. Although it is non-standard, the standard headers shipped with some compilers (notably some versions of Microsoft compilers) do declare a function named max(), so will give problems with your code. The standard specifies that the <algorithm> header supplies a templated std::max() function, and some other standard headers might #include that header (another quaint quirk of some implementations of the standard libraries).

Which is why I do not advocate using using namespace std.
Hmm. I might just write an article about that one.

[Coca cola]

Thank you both !