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

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; }

andCircleoverride

function and provides its own implementation:

class Shape { public: virtual double getArea() = 0; // 虚拟函数声明 };

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, theShapeclass defines a virtual

function, subclassed by

andCircleoverrides. TheprintAreafunction uses function overloading to handle different types ofShapeobjects and print their areas.

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