foo.c: In function ‘main’:
foo.c:5:13: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘long long int *’ [-Wformat=]
    5 |     scanf("%d", &num);
      |            ~^   ~~~~
      |             |   |
      |             |   long long int *
      |             int *
      |            %lld
foo.c:11:38: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=]
   11 |     printf("该整数中所有数字之和为: %d\n", sum);
      |                                     ~^     ~~~
      |                                      |     |
      |                                      int   long long int
      |                                     %lld