#include <stdio.h>

/*
 * sample program for loop idioms
 */

struct list_struct {
	char *name;
	struct list_struct *next;
};

main()
{
	int i, n, c;
	int array[] = {1, 2, 3};
	struct list_struct *p, *list;
	char s[] = "hello";
	char *sp;

	struct list_struct a = {"apple", NULL};
	struct list_struct b = {"banana", NULL};
	a.next = &b;

	/* for loop */

	n = sizeof(array) / sizeof(array[0]);
	for (i = 0; i < n; i++)
		printf("%d\n", array[i]);

	/* list search */

	list = &a;
	for (p = list; p != NULL; p = p->next)
		printf("%s\n", p->name);

	/* endless loop */

	printf("Press Control-d\n");
	for(;;) {
		if ((c = getchar()) == EOF)
			break;
	}

	printf("Press Control-d\n");
	while(1) {
		if ((c = getchar()) == EOF)
			break;
	}

	/* loop getting a character */

	printf("Press Control-d to exit the loop\n");
	while((c = getchar()) != EOF)
		putchar(c);

	/* switch */

	printf("Input any character\n");
	c = getchar();
	switch (c) {
	case 'a':
		;
		/* drop */		/* need commnet when there is drop */
	case 'b':
		printf("%c\n", c);
		break;			/* need break */
	default:
		printf("other character\n");
		break;			/* need break at the end of default */
	}

	/* idiom for string copy */

	sp = (char *)malloc(strlen(s) + 1);	/* need +1 */
	strcpy(sp, s);
	printf("%s\n", sp);

	exit(0);
}