foo.c: In function 'main':
foo.c:8:30: error: expected ')' before 'a'
    8 |     printf("a 和b 的和：%d，"a + b);
      |           ~                  ^
      |                              )
foo.c:8:26: warning: format '%d' expects a matching 'int' argument [-Wformat=]
    8 |     printf("a 和b 的和：%d，"a + b);
      |                         ~^
      |                          |
      |                          int
foo.c:9:34: error: expected ')' before 'a'
    9 |         printf("a 和b 的积：%d，"a * b);
      |               ~                  ^
      |                                  )
foo.c:9:30: warning: format '%d' expects a matching 'int' argument [-Wformat=]
    9 |         printf("a 和b 的积：%d，"a * b);
      |                             ~^
      |                              |
      |                              int
foo.c:10:34: error: expected ')' before 'a'
   10 |         printf("a 和b 的余：%d，"a % b);
      |               ~                  ^
      |                                  )
foo.c:10:30: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   10 |         printf("a 和b 的余：%d，"a % b);
      |                             ~^
      |                              |
      |                              int
foo.c:6:13: warning: unused variable 'b' [-Wunused-variable]
    6 |         int b = 5;
      |             ^
foo.c:5:13: warning: unused variable 'a' [-Wunused-variable]
    5 |         int a = 3;
      |             ^

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