add: printf(" ");
context: print_days(int daynum){	char *days[7] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};	unsigned short int days_of_week[7] = {64, 32, 16, 8, 4, 2, 1};	unsigned short int i, nbdays=0;	for (i=0; i<7; i++) {		if ((days_of_week[i] & daynum) == days_of_week[i])		{			if (nbdays>0)				printf(",%s", days[i]);			else				printf("%s", days[i]);			++nbdays;		}	}}