/in/foo.c: In function 'main':
/in/foo.c:5:5: error: too few arguments to function 'printf'
     printf();
     ^~~~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:364:12: note: declared here
 extern int printf (const char *__restrict __format, ...);
            ^~~~~~