/in/foo.c: In function 'main':
/in/foo.c:258:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(a[0]);
  ^~~~
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:248:11: warning: unused variable 'tar2' [-Wunused-variable]
  int tar1,tar2;
           ^~~~
/in/foo.c:248:6: warning: unused variable 'tar1' [-Wunused-variable]
  int tar1,tar2;
      ^~~~
/in/foo.c:247:10: warning: unused variable 'j' [-Wunused-variable]
  int tar,j;
          ^
/in/foo.c:247:6: warning: unused variable 'tar' [-Wunused-variable]
  int tar,j;
      ^~~
/tmp/ccnvzyMS.o: In function `main':
foo.c:(.text.startup+0x8f): warning: the `gets' function is dangerous and should not be used.