/*
 * Extremely simple example of working with strings in different ways.
 */
#include <stdio.h>
#include <string.h>

/* find and print length of string, accessing it as an array */
void print_len_1(char s[]) {
	int count = 0;
	for (int i = 0; s[i] != '\0' ; ++i) {
		++count;
	}
	printf("length of '%s' using print_len_1 is %d\n", s, count);
}

/* find and print length of string, accessing it using pointers */
void print_len_2(char *s) {
	char *p = s;
	while (*p != '\0') ++p;
	printf("length of '%s' using print_len_2 is %d\n", s, p-s);
}

/* find length of string using recursion */
int recur_len(char *s) {
	if (*s == '\0')
		return 0;
	else
		return 1 + recur_len(s+1);
}
void print_len_3(char* s) {
	printf("length of '%s' using print_len_3 is %d\n", s, recur_len(s));
}

/* find and print length of strin using library function */
void print_len_4(char* s) {
	printf("length of '%s' using library function is %d\n", s, strlen(s));
}

/* main program */
int main(void) {
	char *s1 = "hello world";
	print_len_1(s1);
	print_len_2(s1);
	print_len_3(s1);
	print_len_4(s1);
	return 0;
}