C语言面向对象编程：动态绑定和静态绑定的解析问答

#include <stdio.h>

typedef struct Shape {
    void (*draw)(struct Shape*);
} Shape;

void drawSquare(struct Shape* s) {
    printf("Drawing a square.\n");
}

void drawCircle(struct Shape* s) {
    printf("Drawing a circle.\n");
}

int main() {
    struct Shape square = {drawSquare};
    struct Shape circle = {drawCircle};

    square.draw(&square);  // 输出：Drawing a square.
    circle.draw(&circle);  // 输出：Drawing a circle.

    return 0;
}

#include <stdio.h>

class Shape {
public:
    virtual void draw() {
        printf("Drawing a shape.\n");
    }
};

class Square : public Shape {
public:
    void draw() {
        printf("Drawing a square.\n");
    }
};

class Circle : public Shape {
public:
    void draw() {
        printf("Drawing a circle.\n");
    }
};

int main() {
    Shape shape;
    Square square;
    Circle circle;

    shape.draw();  // 输出：Drawing a shape.
    square.draw();  // 输出：Drawing a square.
    circle.draw();  // 输出：Drawing a circle.

    return 0;
}