Does C++ compiler create default constructor when we write our own?

In this tutorial, we will be discussing a program to understand if the C++ compiler creates a default constructor when we write our own.

Generally, the C++ compiler uses the default constructor when no one is defined, but always uses the one defined by the user if any.

Example

 Live Demo

#include<iostream> using namespace std; class myInteger{ private:    int value;    //other functions in class }; int main(){    myInteger I1;    getchar();    return 0; }

Output

Compiles successfully

Example

#include<iostream> using namespace std; class myInteger{    private:       int value;    public:       myInteger(int v) //user-defined constructor    { value = v; }    //other functions in class }; int main(){    myInteger I1;    getchar();    return 0; }

Output

Gives error about user-defined constructor not being defined