1. //
    2. //  main.c
    3. //  test_a8
    4. //
    5. //  Created by dezhu on 2021/12/28.
    6. //  Copyright © 2021年 dezhu. All rights reserved.
    7. //
    9. #include <stdio.h>
    11. int main(int argc, const char * argv[]) {
    12.     // insert code here...
    13.     struct date{
    14.         int year;
    15.         int month;
    16.         int day;
    17.     };
    18.     struct date today;
    19.     today.year = 2020;
    20.     today.month = 04;
    21.     today.day = 20;
    22.     printf("%i.%i.%i",today.year,today.month,today.day);
    23.     system("pause");
    24.     printf("Hello, World!\n");
    25.     return 0;
    26. }
    1. //
    2. //  main.c
    3. //  test_a9
    4. //
    5. //  Created by dezhu on 2021/12/28.
    6. //  Copyright © 2021年 dezhu. All rights reserved.
    7. //
    9. #include <stdio.h>
    11. int main(int argc, const char * argv[]) {
    12.     // insert code here...
    13.     struct date{
    14.         int year;
    15.         int month;
    16.         int day;
    17.     };
    18.     struct date days[3]={
    19.         {2020,04,20},
    20.         {2020,05,20},
    21.         {2020,06,20}
    22.     };
    23.     printf("%i.%i.%i",days[2]);
    24.     system("pause");
    25.     printf("Hello, World!\n");
    26.     return 0;
    27. }
    1. //
    2. //  main.c
    3. //  test_a10
    4. //
    5. //  Created by dezhu on 2021/12/28.
    6. //  Copyright © 2021年 dezhu. All rights reserved.
    7. //
    9. #include <stdio.h>
    11. int main(int argc, const char * argv[]) {
    13.         struct date{
    14.             int year;
    15.             int month;
    16.             int day;
    17.         };
    18.         struct days{
    19.             struct date yesterday;
    20.             struct date today;
    21.             struct date tomorrow;
    22.         };
    23.         struct days one[2]={
    24.             {{2020,04,19}},
    25.             {{2020,04,20}}
    26.         };
    27.         printf("%i.%i.%i",one[1]);
    28.         return 0;
    29. }
    1. //
    2. //  main.c
    3. //  test_a11
    4. //
    5. //  Created by dezhu on 2021/12/28.
    6. //  Copyright © 2021年 dezhu. All rights reserved.
    7. //
    9. #include <stdio.h>
    11. int main(int argc, const char * argv[]) {
    12.     // insert code here...
    13.     union date{
    14.         int year;
    15.         int month;
    16.         int day;
    17.     }today;
    18.     //struct date today;
    19.     today.year = 2020;
    20.     today.month = 04;
    21.     today.day = 20;
    22.     printf("%i.%i.%i",today.year,today.month,today.day);
    23.     system("pause");
    24.     printf("Hello, World!\n");
    25.     return 0;
    26. }