/in/foo.c: In function 'main':
/in/foo.c:10:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(n);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c:6:6: warning: unused variable 'i' [-Wunused-variable]
  int i,l;
      ^
/in/foo.c: In function 'plus':
/in/foo.c:22:7: warning: unused variable 'j' [-Wunused-variable]
 int i,j,k,al,bl,t;
       ^
/tmp/ccCrQc7H.o: In function `main':
foo.c:(.text.startup+0x13): warning: the `gets' function is dangerous and should not be used.