C: البنى (struct)

struct Student {
    char name[20];
    int age;
    float score;
};

struct Student s1;
struct Student s2, s3;

struct Point {
    int x;
    int y;
} p1, p2;

struct {
    int width;
    int height;
} box;

struct Student s1 = {"Zhang", 20, 89.5};

struct Student s2 = {.name = "Li", .score = 92.0, .age = 21};

struct Student s3 = {"Wang"};

struct Student s = {"Zhao", 19, 78.5};
printf("Name: %s\n", s.name);
printf("Age: %d\n", s.age);
s.score = 85.0;

struct Student s = {"Zhao", 19, 78.5};
struct Student *ps = &s;
printf("Name: %s\n", ps->name);
ps->age = 20;

#include <stdio.h>

struct Book {
    char title[50];
    char author[30];
    float price;
};

int main(void) {
    struct Book b1 = {.title = "The C Programming Language", .author = "K&R", .price = 45.0};
    struct Book *pb = &b1;

    printf("Title: %s\n", pb->title);
    printf("Author: %s\n", pb->author);
    printf("Price: %.1f\n", pb->price);

    pb->price = 55.0;
    printf("After discount: %.1f\n", b1.price);
    return 0;
}

Title: The C Programming Language
Author: K&R
Price: 45.0
After discount: 55.0

struct Student class[3] = {
    {"Zhang", 20, 89.5},
    {"Li", 21, 92.0},
    {"Wang", 19, 78.0}
};

for (int i = 0; i < 3; i++) {
    printf("%s %d %.1f\n", class[i].name, class[i].age, class[i].score);
}

Zhang 20 89.5
Li 21 92.0
Wang 19 78.0

struct Student *p = class;
for (int i = 0; i < 3; i++, p++) {
    printf("%s %.1f\n", p->name, p->score);
}

void print_student(struct Student *ps) {
    printf("%s, age %d, score %.1f\n", ps->name, ps->age, ps->score);
}

int main(void) {
    struct Student s = {"Zhang", 20, 89.5};
    print_student(&s);
    return 0;
}

Zhang, age 20, score 89.5

void add_score(struct Student s, float bonus) {
    s.score += bonus;
}

void add_score(struct Student *s, float bonus) {
    s->score += bonus;
}

#include <stdio.h>

struct Score {
    char name[20];
    int chinese;
    int math;
    int english;
};

int total(struct Score *s) {
    return s->chinese + s->math + s->english;
}

void boost(struct Score *s, int bonus) {
    s->chinese += bonus;
    s->math += bonus;
    s->english += bonus;
}

int main(void) {
    struct Score stu = {.name = "Zhou", .chinese = 80, .math = 75, .english = 88};
    printf("Original total: %d\n", total(&stu));
    boost(&stu, 5);
    printf("After bonus: %d\n", total(&stu));
    return 0;
}

Original total: 243
After bonus: 258

struct Student s1 = {"Zhang", 20, 89.5};
struct Student s2;
s2 = s1;

int equal(struct Student *a, struct Student *b) {
    return a->age == b->age && a->score == b->score;
}

struct Date {
    int year;
    int month;
    int day;
};

struct Employee {
    char name[20];
    struct Date birthday;
    float salary;
};

struct Employee e = {"Chen", {1995, 6, 15}, 8000.0};
printf("Birthday: %d-%02d-%02d\n", e.birthday.year, e.birthday.month, e.birthday.day);

Birthday: 1995-06-15