/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
gets(s);
^~~~
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:14:5: warning: array subscript has type 'char' [-Wchar-subscripts]
a[s[i]]++;
^
/in/foo.c:5:13: warning: unused variable 'k' [-Wunused-variable]
int i,j,k,l,a[128]={0};
^
/tmp/ccF8OFTJ.o: In function `main':
foo.c:(.text.startup+0x30): warning: the `gets' function is dangerous and should not be used.