/in/foo.cc: In function 'int main()':
/in/foo.cc:17:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(str);
     ^~~~
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:17:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(str);
             ^
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: In function 'int Val(char*)':
/in/foo.cc:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < strlen(str); i++) {
                     ~~^~~~~~~~~~~~~
/in/foo.cc: In function 'int jiSuan(int, char, int)':
/in/foo.cc:32:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/tmp/ccE29bB6.o: In function `main':
foo.cc:(.text.startup+0x9): warning: the `gets' function is dangerous and should not be used.