/in/foo.cc: In function 'int timesCounter(char*, char*)':
/in/foo.cc:9:29: error: 'strlen' was not declared in this scope
     int length = strlen(str2);
                             ^
/in/foo.cc:11:37: error: 'strstr' was not declared in this scope
     while ((str1 = strstr(str1, str2))) {
                                     ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(main);
     ^~~~
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:20:14: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(main);
              ^
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:21:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(child);
     ^~~~
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:21:15: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(child);
               ^
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__;
              ^~~~