Подсчет слов в предложении(функция)

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
 
int word(string s)
{
    int count = 0;
    stringstream ss(s);
    while (ss >> s) count++;
    cout << count << "\n";
    return count;
}
 
int main()
{
    int c = 0, sum = 0;
    bool a;
    cout << "Enter sentence: ";
    string s;
    getline(cin, s);
    c = word(s);
    sum += c;
    cout << "Enter one more sentence? (1-yes,0-no): ";
    cin >> a;
    if (a)
    {
        c = 0;
        cout << "Enter sentence: ";
        getline(cin, s);
        c = word(s);
        sum += c;
        cout << "Amount of words: " << sum << endl;
    }
    else cout << "Amount of words: " << sum << endl;
    system("pause");
    return 0;
}

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
 
int CountWords(string const&str)
{
    int count=0;
    string word;
    stringstream words(str);
    while (words >> word) 
    {
        count++;
    }
    return count;
}
 
int main()
{
    char ch;
    do
    {
    cout << "Enter sentence:\n";
    string s;
    cin.ignore();
    getline(cin, s);
    
    cout << "count=" << CountWords(s) << "\n";
    cout << "Continue? (Y - YES) "; cin >> ch;
    }     
    while (ch=='Y' || ch=='y');
system("pause");
return 0;
}