G&R Blog Release Regulation

class的实现示例

我们定义一个 box 类, 定义它的属性为长宽高, 它的方法是计算和打印它的体积

#include <iostream>

class Box {
 private:
  double length;
  double breadth;
  double height;

 public:
  Box(double len, double bre, double hei);
  ~Box();
  double getVolume();
  void setVolume(double len, double bre, double hei);
  void printVolume();
};

Box::Box(double len, double bre, double hei) {
  length  = len;
  breadth = bre;
  height  = hei;
  std::cout << "obj is being created." << std::endl;
}

Box::~Box() {
  std::cout << "obj is being destroyed." << std::endl;
}

double Box::getVolume() {
  return length * breadth * height;
}

void Box::setVolume(double len, double bre, double hei) {
  length  = len;
  breadth = bre;
  height  = hei;
}

void Box::printVolume() {
  std::cout << "the volume of this box: " << getVolume() << std::endl;
}

int main() {
  Box box1(1.0, 2.0, 3.0);
  Box box2(1.0, 2.0, 3.0);
  box1.setVolume(1.0, 2.0, 3.0);
  box2.setVolume(5.0, 6.0, 7.0);
  box1.printVolume();
  box2.printVolume();
  return 0;
}

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