/in/foo.c: In function 'isSxh':
/in/foo.c:4:18: error: '\U0000ff08num' undeclared (first use in this function)
    4 |         int tens=（num/10）%10;
      |                  ^~~~~
/in/foo.c:4:18: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:4:24: error: invalid suffix "）" on integer constant
    4 |         int tens=（num/10）%10;
      |                        ^~~~
/in/foo.c: In function 'main':
/in/foo.c:10:34: error: 'n' undeclared (first use in this function)
   10 |         for(int num=100;num<=999;n++){
      |                                  ^
/in/foo.c:12:38: error: expected ')' before 't'
   12 |                         printf("%d\n"t,num);
      |                               ~      ^
      |                                      )
/in/foo.c:12:34: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   12 |                         printf("%d\n"t,num);
      |                                 ~^
      |                                  |
      |                                  int