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#include <stdio.h>

struct Biology {
    bool living;
};

struct Animal : Biology {
    bool movable;
    void foidFood() { };
};

struct Plant : Biology {
    bool growable;
};

struct Beast : Animal {
    void sleep() { };
};

struct Human : Animal {
    void sleep() { };
    void work() { };
};

struct Girl : Human
{
private:
    int age;
    int weight;
public:
    void print()
    {
        age = 22;
        weight = 48;
        
        printf("I am a girl, I am %d years old.n", age);
        printf("My weight is %d kg.n", age);
    }
};

struct Boy : Human
{
private:
    int height;
    int salary;
public:
    int age;
    int weight;
    
    void print()
    {
        height = 175;
        salary = 9000;
        
        printf("I am a boy, my height is %d cm.n", height);
        printf("My salary is %d RMB.n", salary);
    }
};

int main()
{
    Girl g;
    Boy b;
    
    g.print();
    
    b.age = 19;
    b.weight = 120;
    
    b.print();

    return 0;
}

输出：
I am a girl, I am 22 years old.
My weight is 22 kg.
I am a boy, my height is 175 cm.
My salary is 9000 RMB.

#include <stdio.h>

int i = 1;

struct Test
{
private:
    int i;
public:
    int j;
    
    int getI()
    {
        i = 3;
        
        return i;
    }
};

int main()
{
    int i = 2;
    
    Test test;
    
    test.j = 4;
    
    printf("i = %dn", i);
    printf("::i = %dn", ::i);
    // printf("test.i = %dn", test.i);  // Error
    printf("j = %dn", test.j);
    printf("test.getI() = %dn", test.getI());
    
    return 0;
}

输出：
i = 2
::i = 1
j = 4
test.getI() = 3

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