printf(a, b, c)

source.c: In function ‘main’:
source.c:14:3: warning: passing argument 1 of ‘printf’ makes pointer from integer without a cast
/usr/include/stdio.h:359:12: note: expected ‘const char * __restrict__’ but argument is of type ‘int’

printf("a=%d, b=%d, c=%#xn", a, b, c);