Practical application cases of C++ function overloading and rewriting

Practical application cases of C function overloading and rewriting

Function overloading

Function overloading allows the same function name to have different implementations to handle different types or numbers of arguments. For example, we can create a function that prints different types of data: Functions with the same name and parameter types have different implementations. For example, we have a base class

Shape

which defines a function to calculate the area:

void print(int value) {
  cout << value << endl;
}

void print(double value) {
  cout << value << endl;
}

int main() {
  int num = 10;
  double number = 12.5;
  print(num); // 调用 print(int)
  print(number); // 调用 print(double)
  return 0;
}

subclasses

Rectangle

and Circle override

getArea

function and provides its own implementation: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:cpp;toolbar:false;'>class Shape { public: virtual double getArea() = 0; // 虚拟函数声明 };</pre><div class="contentsignin">Copy after login</div></div>Practical Case Consider the following example, which uses function overloading and function overriding to Create a program that calculates the area of ​​a shape:

class Rectangle: public Shape {
public:
  double width, height;
  Rectangle(double width, double height) : width(width), height(height) {}
  double getArea() override {
    return width * height;
  }
};

class Circle: public Shape {
public:
  double radius;
  Circle(double radius) : radius(radius) {}
  double getArea() override {
    return 3.14 * radius * radius;
  }
};

In this case, the Shape class defines a virtual

getArea

function, subclassed by

Rectangle

and Circle overrides. The printArea function uses function overloading to handle different types of Shape objects and print their areas.

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