/in/foo.cc: In function 'int main()':
/in/foo.cc:24:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(str);//输入
  ^~~~
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:24:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(str);//输入
          ^
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:46:15: warning: comparison with string literal results in unspecified behavior [-Waddress]
   if (*end != "\0") //如果end没有指向数组结尾，那么它此时指向的是空格
               ^~~~
/in/foo.cc:46:15: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]