#include <stdio.h>
#include <string.h>

int main(void)
{
	char a[6] = "hello";
	/* error */
	/* char a[5] = "hello"; */
	char b[100] = "world";
	char c[100];

	int i, len;

	printf("%s\n", a);

	printf("%d\n", strlen(b));

	len = strlen(a);

	for (i=0; i<len; i++) {
		printf("%c\n", a[i]);
	}

	strcpy(c, a);
	printf("%s\n", c);
	strcat(c, b);
	printf("%s\n", c);

	return 0;
}