4.1.7.1 Removing operations

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

using namespace std;

void print(const int & value)
{
	cout << value << " ";
}

bool str(const int & a) {

	int n = 0;
	string s = to_string(a);
	char const *pchar = s.c_str();
	for (int i = 0; i < s.length(); i++) {
		if (pchar[i] == '3')
			n++;
	}
	if (n != 0)
		return true;
	else return false;
}

struct Three
{
	int n;
	Three() :n(0) {}
	bool operator()(const int & a)
	{
		n = a - (a / 10) * 10;
		return (a % 3 == 0) || (str(a));
	}
};

struct Generate
{
	int s;
	int n;
	Generate(int n1) : s(1), n(n1) {}
	int operator()()
	{
		do {
			return s++;
		} while (s != n);
	}
};

int main()
{
	int count;
	cin >> count;
	vector<int> results(count);
	generate(results.begin(), results.end(), Generate(count));
	vector<int>::iterator newEnd = remove_if(results.begin(), results.end(), Three());

	for_each(results.begin(), newEnd, print);

	system("pause");
	return 0;
}