/in/foo.cc: In function 'int evaluate(char*, int)':
/in/foo.cc:99:9: warning: unused variable 'res' [-Wunused-variable]
     int res = expression(s, it, n, avalue);
         ^~~
/in/foo.cc:100:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:112:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(tmplate);
     ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:112:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(tmplate);
                 ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:116:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(match[i]);
         ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:116:22: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(match[i]);
                      ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc: In function 'int primary(char*, int&, int, int)':
/in/foo.cc:52:12: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return res;
            ^~~
/tmp/ccNgkXcK.o: In function `main':
foo.cc:(.text.startup+0x29): warning: the `gets' function is dangerous and should not be used.