C++ split sentence ez

#include <iostream>
#include <string>
#include <vector>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

int main(int argc, const char * argv[])
{
    string sentence;
    string tmp;
    vector<string> v;

    cout << "Enter a sentence: ";
    getline(cin, sentence);

    for(int i = 0; i < sentence.length(); i++) {

        tmp += sentence[i];

        // Check for whitespace or if we are at the end of the string
        if((sentence[i] == ' ') || (i == sentence.length() - 1)) {
            // push back current tmp value
            v.push_back(tmp);
            // clear tmp string
            tmp = "";
        }
    }

    for (int i = 0; i < v.size(); i++)
    {
        cout << v[i] << " ";
    }
    cout << endl;