从字符串中分离数字

#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>
using namespace std;
int main()
{
	string str;
	string temp;
	vector<int> arr;
	cin >> str;
	int pos = 0;
	int i = 0;
	while ((pos = str.find(",", i)) != string::npos)
	{
		temp = str.substr(i, pos - i);
		i = pos + 1 ;
		int a = atoi(temp.c_str());
		arr.push_back(a);
	}
	temp = str.substr(i);
	int a = atoi(temp.c_str());
	arr.push_back(a);
	vector<int>::iterator iter = arr.begin();
	for (; iter != arr.end(); iter++)
		cout << *iter <<" ";
	cout << endl;
	return 0;
}