Question

class Triangulo: public Figura
{
    public:
    int x1, y1, x2, y2, x3, y3;
    void dibujar_triangulo()
    {
        cout<<"Se ha dibujado un triangulo color "<<color<<" con coordenadas "<<
        "("<<x1<<","<<y1<<")"<<endl<<"("<<x2<<","<<y2<<")"<<endl<<"("<<x3<<","<<y3<")"<<endl;
    }
};

I’ve got this error:

invalid operands of types 'const char [2]' and '<unresolved overloaded function type>' to binary 'operator<<'

What’s wrong?

Also, Here’s the whole code:

#include <conio.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;

class Figura
{
    public:
    string color, nombre;
    int num_lados;
    void establecer_color(string param)
    {
        color=param;
    }
    string obtener_color()
    {
        string a;
        cin>>a;
        return a;
    }
    void establecer_lados(int param)
    {
        num_lados=param;
    }
    int obtener_lados()
    {
        int a;
        cin>>a;
        return a;
    }
};

class Circulo: public Figura
{
    public:
    int x, y;
    void dibujar_circulo()
    {
        cout<<"Se ha dibujado un circulo color "<<color<<" con centro en ("<<x<<","<<y<<")"<<endl;
    }
};

class Rectangulo: public Figura
{
    public:
    int x1, y1, x2, y2;
    void dibujar_rectangulo()
    {
        cout<<"Se ha dibujado un rectangulo color "<<color<<" con coordenadas "
        <<"("<<x1<<","<<y1<<")"<<endl<<"("<<x2<<","<<y2<<")"<<endl;
    }
};

class Triangulo: public Figura
{
    public:
    int x1, y1, x2, y2, x3, y3;
    void dibujar_triangulo()
    {
        cout<<"Se ha dibujado un triangulo color "<<color<<" con coordenadas "<<
        "("<<x1<<","<<y1<<")"<<endl<<"("<<x2<<","<<y2<<")"<<endl<<"("<<x3<<","<<y3<")"<<endl;
    }
};

int main()
{
    Circulo Cir;
    Triangulo Tri;
    Rectangulo Rec;
    int i;
    initsw:
    cout<<"Eliga:"<<endl<<"1.\tCirculo"<<endl<<"2.\tRectangulo"
    <<endl<<"3.\tTriangulo"<<endl<<"4.\tSalir"<<endl;
    cin>>i;
    cout<<"Indique el color de su figura"<<endl;
    cin>>Cir.color;
    Tri.color=Cir.color;
    Rec.color=Cir.color;
    switch (i)
    {
        case 1:
        cout<<"Por favor introduzca el centro de su circulo:(x,y)"<<endl;
        scanf("(%d,%d)",&(Cir.x),&(Cir.y));
        Cir.dibujar_circulo();
        break;
        case 2:
        cout<<"Por favor introduzca las coordenadas de su rectangulo:(x1,y1),(x2,y2)"<<endl;
        scanf("(%d,%d),(%d,%d)",&(Rec.x1),&(Rec.y1),&(Rec.x2),&(Rec.y2));
        Rec.dibujar_rectangulo();
        break;
        case 3:
        cout<<"Por favor introduzca las coordenadas de su triangulo:(x1,y1),(x2,y2),(x3,y3)"<<endl;
        scanf("(%d,%d),(%d,%d),(%d,%d)",&(Tri.x1),&(Tri.y1),&(Tri.x2),&(Tri.y2),&(Tri.x3),&(Tri.y3));
        Tri.dibujar_triangulo();
        break;
        case 4:
        goto end;
        break;
        default:
        cout<<"Error, elija otra opcion"<<endl;
        goto initsw;
    }
    end:
    return 0;
}

Answer 1

It is a typo. You only wrote < before the last ")" in your function. Some things are just easier to spot with properly formatted code:

void dibujar_triangulo()
{
    cout << "Se ha dibujado un triangulo color " << color << " con coordenadas "
         << "(" << x1 << "," << y1 << ")" << endl
         << "(" << x2 << "," << y2 << ") "<< endl
         << "(" << x3 << "," << y3 < ")" << endl;
//                                 ^^ should be <<
}