/in/foo.cc: In function 'int main()':
/in/foo.cc:10:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(n);
  ^~~~
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:10:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(n);
        ^
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:6:6: warning: unused variable 'i' [-Wunused-variable]
  int i,l;
      ^
/in/foo.cc: In function 'void plus(char*, char*, char*)':
/in/foo.cc:22:7: warning: unused variable 'j' [-Wunused-variable]
 int i,j,k,al,bl,t;
       ^
/tmp/cco06RL5.o: In function `main':
foo.cc:(.text.startup+0x13): warning: the `gets' function is dangerous and should not be used.