//
//  main.c
//  for_test
//
//  Created by Taras Zakharko on 09/03/16.
//  Copyright © 2016 Taras Zakharko. All rights reserved.
//

#include <stdio.h>


int n = 5;

// loop control functions
int init_counter() {return(0);}
int check_condition(int i) {return(i<=n);}
int increment_counter(int i) {return(i+1);}

// Iterator protocol
typedef struct {
    int counter;
    int end;
} Iterator;

void init_iterator(Iterator *iter, int start, int end) {
    iter->counter = start;
    iter->end = end;
}

void advance_iterator(Iterator *iter) {
    iter->counter++;
}

int check_iterator(Iterator *iter) {
    return(iter->counter <= iter->end);
}


int main(int argc, const char * argv[]) {
    // standard loop
    for(int i = 0; i <= n; i++) {
        printf("i=%d\n", i);
    }
    
    // using functions for conditions
    for(int i = init_counter(); check_condition(i); i = increment_counter(i)) {
        printf("i=%d\n", i);
    }
    
    // using an iterator abstraction
    Iterator iter;
    
    for(init_iterator(&iter, 0, n);check_iterator(&iter);advance_iterator(&iter)) {
        printf("i=%d\n", iter.counter);
    }
}