Советы по упрощению кода. Количество слов в строке

#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
 
int main()
{
    setlocale(LC_CTYPE,"Russian");
    string S; unsigned int count = 1, i = 0;
    cout << "Enter your string." << endl;
    getline(cin,S);
    while (S[i] != '\0')
    {
        if (S[i] == ' ' && i != 0 && S[i + 1] != '\0')
        {
            count++;
        }
        i++;
    }
    cout << "Words number: " << count;
    _getch();
    return 0;
}

#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
 
int main()
{
    setlocale(LC_CTYPE,"Russian");
    
    string S; 
    int count = 1;
    cout << "Enter your string." << endl;
    getline(cin,S);
 
    for(int i=0; S[i]!='\0'; i++) 
       if (S[i]==' ' || S[i+1]=='\0') count++; 
    
    cout << "Words number: " << count;
    _getch();
    return 0;
}

#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
 
int main()
{
    setlocale(LC_CTYPE,"Russian");
    string S; unsigned int count = 1, i = 0;;
    cout << "Enter your string." << endl;
    getline(cin,S);
    while (S[i] != '\0')
    {
        if (S[i] == ' ' && i != 0 && S[i + 1] != '\0' 
            && S[i + 1] != ' ' && !isdigit(S[i + 1]))
        {
            count++;
        }
        i++;
    }
    cout << "Words number: " << count;
    _getch();
    return 0;
}

#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
 
int main()
{
    setlocale(LC_CTYPE,"Russian");
    string S; unsigned int count = 1, i = 0;;
    cout << "Enter your string." << endl;
    getline(cin,S);
    while (S[i] != '\0')
    {
        if (S[i] == ' ' && i != 0 && S[i + 1] != '\0' 
            && S[i + 1] != ' ' && !isdigit(S[i + 1]) 
            && !ispunct(S[i+1]))
        {
            count++;
        }
        i++;
    }
    cout << "Words number: " << count;
    _getch();
    return 0;
}

#include <iostream>
#include <string>
#include <sstream>
 
int main()
{
    std::string S;
    std::cout << "Enter your string.\n";
    std::getline(std::cin, S);
 
    unsigned int counter = 0;
    std::istringstream ist(S);
    for (std::string word; ist >> word; counter++);
 
    std::cout << "Words number: " << counter;
}

" ,.\"!?:;"

S = "     Grandma!  I  remember  her birth.";

#include "stdafx.h"
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
 
int string_num (string S, unsigned int count, unsigned int i)
{
    if (S[i] != ' ' && S[i] != '\0')
        count = 1;
    else
        count = 0;
    if (S[0] != '\0')
    {
        while (S[i] != '\0')
        {
            if (S[i] == ' ' && S[i + 1] != ' ' && S[i + 1] != '\0'
                && !isdigit(S[i + 1]) 
                && !ispunct(S[i+1]))
            {
                count++;
            }
        i++;
        }
        cout << "Words number: " << count << endl;
    }
    else
        cout << "You've entered an empty string" << endl;
    return count;
}
 
int main()
{
    setlocale(LC_CTYPE,"Russian");
    string S; unsigned int count, i = 0;;
    cout << "Enter your string." << endl;
    getline(cin,S);
    string_num(S, count, i);
    _getch();
    return 0;
}

cout << "Words number: " << string_num(string, count, i)

#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
#include <algorithm>
#include <iostream>
#include <string>
 
int main() {
  std::string str;
  std::getline( std::cin, str );
 
  auto words_iter = boost::make_split_iterator(str, boost::token_finder( boost::is_any_of(" ,.\"!?:;" )));
  auto words_num = std::distance( words_iter, decltype( words_iter )() );
 
  std::cout << words_num << std::endl;
}