Link 1120 ошибка

I was writing a C++ program in visual studio 2013 and the
program is very simple one and when I compile there was error
this is third time I see this error.
Here’s the program:

#include <iostream>
using namespace std;

int main()
{
    int x, y, z = 0;
    char c;
    bool quit = true;

    while (quit == true)
    {
        cout << "enter a number : ";
        cin >> x;
        cout << "enter a sign : ";
        cin >> c;
        cout << "enter another number : ";
        cin >> y;

        if (c == '+')
            z = x + y;
        if (c == '-')
            z = x - y;
        if (c == '*')
            z = x * y;
        if (c == '/' && y != 0)
            z = x / y;
        if (c == 'q')
            quit = false;

        cout << "Answer is : " << z << endl;
    }

    return 0;
}

…and here’s the error:

1>------ Build started: Project: Calculator_madeByMe, Configuration: Debug Win32 ------
1>  Source.cpp
1>MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
1>C:UsersSorenadocumentsvisual studio 2013ProjectsCalculator_madeByMeDebugCalculator_madeByMe.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========>

Your compiling as a Windows application, which does not use the «int main()» signature when calling the entry point.

Switch to a console application in Project -> Properties -> Linker -> System -> SubSystem -> Console. There might be more involved than just this setting, so if it still doesn’t compile, remake your project and make sure to choose Console Application.

answered May 23, 2014 at 23:19

I get the ERROR LNK1120: 1 unresolved externals & ERROR LNK2019: unresolved external symbol ! While Compiling

Some threads — I end up while searching — say is something about class definitions and other that is something with the .cpp /.h files

The errors:

ERROR LNK1120: 1 unresolved externals.  

ERROR LNK2019: unresolved external symbol "public: __thiscall bandera_Triang::~bandera_Triang(void)" (??1bandera_Triang@@QAE@XZ) referenced in function _main.

Here is the code:

#include <iostream>
using namespace std;

class bandera_Triang {
private:
    float aSide, bSide, cSide;

public:
    bandera_Triang(){ //Cost. sin Param...
        aSide = 0;
        bSide = 0;
        cSide = 0;
    }
    bandera_Triang(float A, float B, float C){ //Const. con Param...
        aSide = A;
        bSide = B;
        cSide = C;
    }

    //Sets...
    void set_A(float A){ aSide = A; }
    void set_B(float B){ bSide = B; }
    void set_C(float C){ cSide = C; }

    //Gets...
    float get_A(){ return aSide; }
    float get_B(){ return bSide; }
    float get_C(){ return cSide; }

    ~bandera_Triang(); //destructor...



    bool esTriang(){ //Desigualdad Triangular...
        if (aSide < bSide + cSide && bSide < aSide + cSide && cSide < aSide + bSide) {
            return true;
        }
        else
            return false;
    }

    string triangOno(bool esTriang()){ //Print si es o no triangulo...
        if (esTriang() == true){
            return "Es Triangulo.";
        }
        else { return "NO es Triangulo."; }
    }

    string tipoTriang(){
        if (aSide == bSide && bSide == cSide){
            return "El triangulo es Equilatero.";
        }
        else
        if (aSide == bSide || aSide == cSide || bSide == cSide){
            return "El triangulo es Isosceles. ";
        }
        return "El triangulo es Escaleno.";
    }

    float arTriang(float aSide, float bSide, float cSide){ //Area Triangulo con F.Heron.

        float lado_A, lado_B, lado_C, SemiPerim, areaTriang; //Variables locales para calculo.

        SemiPerim = (lado_A + lado_B + lado_C) / 2; //Calculo de Semiperimetro.

        areaTriang = sqrt(SemiPerim * (SemiPerim - lado_A) * (SemiPerim - lado_B) * (SemiPerim - lado_C));

        return areaTriang;
    }

    string printArea(float arTriang){ cout << "El area del Triangulo es: " << arTriang << "cm2." << endl; } //Imprime Area :)
}; //Fin Clase Triangulo


//Inicia Main

int main(){

    bandera_Triang triangA;

    system("pause");
}