For loops [C++]

forLoops.cpp

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

void print(const int& i) {
	cout << i << ' ';
}

int main() {
	
	vector<int> numbers = {1,2,3,4};
	
	// Classic for loop
	for (int i = 0; i < numbers.size(); i++) {
		cout << numbers[i] << ' ';
	}
	
	cout << endl;
	
	// For with iterators
	for (vector<int>::iterator it = numbers.begin(); it != numbers.end(); ++it) {
		cout << *it << ' ';
	}
	
	cout << endl;
	
	// Range-based for loop (since C++11) (similar to Janumbersa)
	for (const int& number: numbers) {
		cout << number << ' ';
	}	
	
	cout << endl;
	
	/* FOR_EACH - Applies a function to a range of elements */
	for_each(numbers.begin(), numbers.end(), print);
	
	cout << endl;
	
	// You can use lambda functions too
	for_each(numbers.begin(), numbers.end(), [](const int& i){ cout << i << ' '; });
	
	// Alternative for_each with boost::lambda
	// for_each(numbers.begin(), numbers.end(), cout << _1 << ' ');
	
	return 0;	
}