/in/foo.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
main()
^~~~
/in/foo.c: In function 'main':
/in/foo.c:8:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
gets(a);
^~~~
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:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
gets(b);
^~~~
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__;
^~~~
/tmp/cc9nF3RF.o: In function `main':
foo.c:(.text.startup+0x12): warning: the `gets' function is dangerous and should not be used.