/in/foo.c: In function 'main':
/in/foo.c:9:3: warning: implicit declaration of function 'pintf' [-Wimplicit-function-declaration]
   pintf("小写字母是：%c\n",ch+32）；
   ^~~~~
/in/foo.c:9:39: error: stray '\357' in program
   pintf("小写字母是：%c\n",ch+32）；
                                       ^
/in/foo.c:9:40: error: stray '\274' in program
   pintf("小写字母是：%c\n",ch+32）；
                                        ^
/in/foo.c:9:41: error: stray '\211' in program
   pintf("小写字母是：%c\n",ch+32）；
                                         ^
/in/foo.c:9:42: error: stray '\357' in program
   pintf("小写字母是：%c\n",ch+32）；
                                          ^
/in/foo.c:9:43: error: stray '\274' in program
   pintf("小写字母是：%c\n",ch+32）；
                                           ^
/in/foo.c:9:44: error: stray '\233' in program
   pintf("小写字母是：%c\n",ch+32）；
                                            ^
/in/foo.c:10:2: error: expected ')' before 'return'
  return 0;
  ^~~~~~
/in/foo.c:11:1: error: expected ';' before '}' token
 }
 ^