/*
    56__strlen.c
    Primjeri implementacije funkcije strlen.
    -----
    Prototip: int strlen(char* s);
    Funkcija strlen vraca duljinu stringa s (ne ukljucujuci posljednji
    '\0' karakter).
*/
 
#include <stdio.h>
 
#define MAX 50
 
int strlen1(char* s) {
    int i;
    for(i=0; s[i]!='\0'; i++);
    return i;
}
 
int strlen2(char* s) {
    char* p;
    for(p=s; *p; ++p);
    return p-s;
}
 
int strlen3(char* s) {
    char* p=s;
    while(*p)
        p++;
    return p-s;
}
 
int main() {
    char s1[MAX];
 
    gets(s1);
    printf("s1: %s\n", s1);
    printf("strlen1(s1): %d\n", strlen1(s1));
    printf("strlen2(s1): %d\n", strlen2(s1));
    printf("strlen3(s1): %d\n", strlen3(s1));
 
    return 0;
}