Use constructor to initialize class fields : constructor « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. constructor

#include <iostream>
using namespace std;

class MyClass {
public:
  int x;

  MyClass(int i);  // constructor
  ~MyClass();      // destructor
};

MyClass::MyClass(int i) {
    x = i;
}

MyClass::~MyClass() {
  cout << "Destructing object whose x value is " << x  <<" \n";
}

int main() {
  MyClass ob(5) ;

  cout << ob.x << "\n";

  return 0;
}

5
Destructing object whose x value is 5