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

main()
{
	char a[30] = "hello, ";
	char *b = "world";

	strncat(a, b, 3);

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

	exit(0);
}

/*
 *      ISO C99 Standard: 7.21 String handling  <string.h>
 *

type
	size_t		NULL

functions
	memcpy		void *mmemcpy(void *s1, const void *s2, site_t n)
	memmove		void *memmove(void *st, const void *s2, size_t n)
	strcpy		char *strcpy(char *st, const char *s2)
	strncpy		char *strncpy(char *s1, const char *s2, size_t n)
	strcat		char *strcat(char *s1, const char *s2)
	strncat		char *strncat(char *s1, const char *s2, size_t n)
	memcmp		void *memcmp(const void *st, const void *s2, size_t n)
	strcmp		int strcmp(const char *s1, const char *s2)
	strcoll		int strcoll(const char *s1, const char *s2)
	strncmp		int strncmp(const char *s1, const char *s2, size_t n)
	strxfrm		size_t strxfrm(char *s1, const char *s2, size_t n)
	memchr		void *memchr(const void *s, int c, size_t n)
	strchr		char *strchr(const char *s, int c);
	strcspn		size_t strcspn(const char *s1, const char *s2)
	strpbrk		size_t strpbrk(const char *s1, const char *s2)
	strrchr		char *strrchr(const char *s, int c)
	strspn		size_t strspn(const char *s1, const char *s2)
	strstr		char *strstr(const char *s1, const char *s2)
	strtok		char *strtok(char *s1, const char *s2)
	memset		void *memset(void *s, int c, size_t n)
	strerror	char *strerror(int errnum)
	strlen		size_t strlen(const char *s)
*/