C ++从另一个文件调用构造函数

Question

I have those 3 files of code, and I want to to print "Mountains were just created" from the constructor. Could you tell me please where I am wrong and what I must to do?

Mountains.h

#ifndef MOUNTAINS_H
#define MOUNTAINS_H

class Mountains{
    public:
        Mountains();
        ~Mountains();
};
#endif

Mountains.cpp

#include <cstdlib>
#include <iostream>
#include "Mountains.h"

Mountains::Mountains()
{
    cout<<"Mountains were just created"<<endl;
}

Mountains::~Mountains()
{
    cout<<"Mountains are about to be destroyed"<<endl;
}

main.cpp

#include <cstdlib>
#include <iostream>
#include "Mountains.h"


int main(int argc, char *argv[])
{

    Mountains m();

    system("PAUSE");
    return EXIT_SUCCESS;
}

I would expect, "Mountains were just created", to be written to the console when I call Mountains m(); This is not happening.

Answer 1

The problem is right here:

Mountains m();

That is not a default-initialized Mountains object called m . It is a function called m that takes no parameters and returns a Mountains .

To create a default-initialized Mountains you need to do:

Mountains m;

or in C++11 :

Mountains m{};

---

You are also missing the std:: qualification when using things from the Standard Library , like cout or endl . That's assuming you don't do using namespace std; , although discoraged, in a relevant place.