ищем слова 1(6)

#include <iostream>

using namespace std;

int main()
{
    cout << "you can enter 20 symbols" << endl;
    char a[21];
    cin.getline(a,21);
    cout << "these symbols take part in the test" << endl;
    cout << a << endl;

    int letters, gaps, word, b, i, m;
    letters = 1;
    gaps = 0 ;
    word = 0;
    b = 1;
    a[21] = 0;

    while ( b < 21)
    {
        if ( a[b] != ' ')
            {
                while (a[b] != ' ')
                {
                    letters++;



                }
                word++;
            }

        else
            {
                while (a[b] = ' ' )
                {
                    gaps++;


                }
            }
            b++;
    }




    cout << "these symbols have   " <<  word  ;
    cout << "  words";
    cout << endl << letters;
    cout << "letters" << endl;
    cout << gaps << "  gaps";
}