/in/foo.c: In function 'main':
/in/foo.c:25:31: error: invalid suffix "；" on integer constant
   25 |                 int b=(n/100)%10；
      |                               ^~~~
/in/foo.c:26:17: error: expected ',' or ';' before 'int'
   26 |                 int c=(n/10)%10;
      |                 ^~~
/in/foo.c:28:44: error: 'c' undeclared (first use in this function)
   28 |                 printf("%d %d %d %d\n",a,b,c,d,);
      |                                            ^
/in/foo.c:28:44: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:28:48: error: expected expression before ')' token
   28 |                 printf("%d %d %d %d\n",a,b,c,d,);
      |                                                ^
/in/foo.c:31:14: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   31 |         else if(digits==3);
      |              ^~
/in/foo.c:32:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   32 |         {
      |         ^
/in/foo.c:39:9: error: 'else' without a previous 'if'
   39 |         else if(digits==2);
      |         ^~~~
/in/foo.c:39:14: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   39 |         else if(digits==2);
      |              ^~
/in/foo.c:40:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   40 |         {
      |         ^
/in/foo.c:44:26: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   44 |             printf("%d%d%d\n",b,a);
      |                         ~^
      |                          |
      |                          int
/in/foo.c:46:9: error: 'else' without a previous 'if'
   46 |         else if(digits=1);
      |         ^~~~
/in/foo.c:46:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   46 |         else if(digits=1);
      |                 ^~~~~~