How to solve several errors of this code?

Question

I typed this program from the book that addresses classes and gave error. How to solve?

#include <iostream>

using namespace std;

class Efetua_calculo{
private:
    double total;
    double soma;
    double divide;

public:
     void mostra_calculo (void){
    cout << "Resultado das funcoes soma() e divide() e :" << endl;
    cout << soma() << endl;
    cout << divide() << endl;
    return;
    }
};
double Efetua_calculo::soma(){

int valor1 = 2;
int valor2 = 3;
total = valor1 + valor2;
return (total);

}
double Efetua_calculo::divide(){
int valor1 = 2;
int valor2 = 3;

total = (double) valor1/valor2;

return(total);
}

int main()
{
Efetua_calculo calculo;
calulo.mostra_calculo();
    return 0;
}

Answer 1

There are typos. Maybe some very serious ones. Maybe the book example is really bad and doesn’t work at all. What then would be good to abandon book so bad. The example is very bad also to learn to program right. There are conceptual errors in it, in addition to the bad structure.

I don’t know if I solved the problem properly but it works:

#include <iostream>
using namespace std;

class Efetua_calculo {
private:
    double total; //do jeito que está este membro não deveria existir
public:
    void mostra_calculo(); //aqui só cabe a declaração e não a definição
    double soma(); //declarei essa função que não estava declarada
    double divide(); //idem, estava declarada como variável
};
double Efetua_calculo::soma(){
    int valor1 = 2;
    int valor2 = 3;
    total = valor1 + valor2;
    return (total);
}
double Efetua_calculo::divide(){
    int valor1 = 2;
    int valor2 = 3;
    total = (double) valor1/valor2;
    return(total);
}
void Efetua_calculo::mostra_calculo(){ //trouxe a implementação p/ cá
    cout << "Resultado das funcoes soma() e divide() e :" << endl;
    cout << soma() << endl;
    cout << divide() << endl;
    return;
}
int main() {
    Efetua_calculo calculo;
    calculo.mostra_calculo(); //tinha erro de digitação aqui
    return 0;
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.