Use putchar(), not printf(), is to generate output.
#include <stdio.h> int main()/* ww w . ja v a 2 s . c o m*/ { char a,b,c,d; a = 'W'; b = 'o'; c = 'w'; d = '\n'; putchar(a); putchar(b); putchar(c); putchar(d); return(0); }