#include <stdio.h>
 
struct cat {
    int id_num;
    int age;
    int HP;
    int MP;
};
 
int main(void) {
 
    struct cat x;
    struct cat y;
 
    x.id_num = 1; x.age = 2; x.HP = 3; x.MP = 4;
 
    y = x;
 
    /* Now y.id_num == 1, y.age == 2, ... */
 
    printf("%d %d %d %d\n", y.id_num, y.age, y.HP, y.MP);
    /* Prints "1 2 3 4\n" */
 
    return 0;
}

struct dog {
    type_1 val_1;
    type_2 val_2;
    type_3 val_3;
    .
    .
    .
    type_n val_n;
};

x.val_1 = y.val_1;
x.val_2 = y.val_2;
x.val_3 = y.val_3;
.
.
.
x.val_n = y.val_n;