CppLearning/EssentialCpp/test_reference.cpp

#include <iostream>
#include <vector>

#include <fstream>

using namespace std;
void display(const vector<int>& v, ostream& os = cout);

void display(const vector<int>& v, ostream& os) {
	for (vector<int>::const_iterator iter = v.begin(); iter != v.end(); ++iter) {
		os << *iter << " ";
	}
	os << endl;
}

void swap(int& value_a, int& value_b) {
	int temp = value_a;
	value_a = value_b;
	value_b = temp;
}

void buble_sort(vector<int>& v, ostream* ofil=0) {
	vector<int>::iterator ix, iy;

	for (ix = v.begin(); ix != v.end(); ++ix) {
		for (iy = ix + 1; iy != v.end(); ++iy) {
			if (*ix > *iy) {
				if (ofil) {//need include #include <fstream>
					(*ofil) << *ix << " " << *iy << endl;
					
				}
				swap(*ix, *iy);
			}
		}
	}
}

int main() {
	vector<int> v = { 0, 1, 0,5,4,3 };

	display(v);

	//swap(v[0], v[1]);

	//display(v);

	ofstream fout("test.txt");
	buble_sort(v, &fout);
	display(v);


	return 0;
}