/*
 * Program to demo/test two string-length functions (solely to
 * illustrate working with strings, since there is a library 
 * function strlen).
 */
#include <stdio.h>

/* compute string length, operating on string as array */
int lng1(char s[]) {
    int lng = 0;
    while (s[lng] != '\0') ++lng;
    return lng;
}

/* compute string length, operating on string using pointer */
int lng2(char *s) {
    char *p = s;
    while (*p != '\0') ++p;
    return p-s;
}

/* main */
int main(void) {
    char *input = "hello world";
    printf("lng1 of %s = %d\n", input, lng1(input));
    printf("lng2 of %s = %d\n", input, lng2(input));
    return 0;
}