Classes and objects

Constructors, private data and const methods.

C++

#include <iostream>
#include <string>
using namespace std;

class Account {
  string owner;
  int balance = 0;

public:
  explicit Account(string name) : owner(std::move(name)) {}

  void deposit(int amount) {
    if (amount > 0) balance += amount;
  }

  int getBalance() const {
    return balance;
  }
};

int main() {
  Account a("Meena");
  a.deposit(500);
  a.deposit(-10);
  cout << a.getBalance() << "\n";
  return 0;
}

Output

Members are private by default in a class. The colon after the constructor is an initialiser list, and const after a method promises that it will not change the object.

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