/in/foo.cc: In function 'int main()':
/in/foo.cc:7:1: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(s1);gets(s2);
 ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:7:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(s1);gets(s2);
        ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:7:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(s1);gets(s2);
          ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:7:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
 gets(s1);gets(s2);
                 ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:8:37: warning: unused variable 'x' [-Wunused-variable]
 int i,j,l1=strlen(s1),l2=strlen(s2),x=0;
                                     ^
/tmp/cclGfUP0.o: In function `main':
foo.cc:(.text.startup+0xc): warning: the `gets' function is dangerous and should not be used.