结构和联合

struct Person {
    char name[20];
    int age;
    float height;
};

int main() {
    struct Person p1;
    strcpy(p1.name, "John");
    p1.age = 25;
    p1.height = 1.75;
    printf("Name: %s\n", p1.name);
    printf("Age: %d\n", p1.age);
    printf("Height: %.2f\n", p1.height);
    return 0;
}

union Data {
    int num;
    float f;
    char str[20];
};

int main() {
    union Data data;
    data.num = 10;
    printf("Num: %d\n", data.num);
    data.f = 3.14;
    printf("Float: %.2f\n", data.f);
    strcpy(data.str, "Hello");
    printf("String: %s\n", data.str);
    return 0;
}