/in/foo.c: In function 'main':
/in/foo.c:7:2: 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:6:15: warning: 'si' is used uninitialized in this function [-Wuninitialized]
int i,si,len,j=si;
^
/tmp/cc7jntx8.o: In function `main':
foo.c:(.text.startup+0x16): warning: the `gets' function is dangerous and should not be used.