classes example : class definition « Class « C++ Tutorial

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2. Class
3. class definition

#include <iostream>
#include <stdio.h>
using namespace std;

class Rectangle {
    int x, y;
  public:
    void set_values (int,int);
    int area (void) {return (x*y);}
};

void Rectangle::set_values (int a, int b) {
  x = a;
  y = b;
}

int main () {
  Rectangle rect;
  rect.set_values (3,4);
  cout << "area: " << rect.area();
  return 0;
}

area: 12"