word n of a string

07.nword.cpp

// 07.nword.cpp
// juanfc 2024-11-15
// 

#include <iostream>
using namespace std;

int main()
{
    string wordn(string s, int n);

    cout << wordn("I. to Programming", 1) << endl; // I
    cout << wordn("I. to Programming", 2) << endl; // to
    cout << wordn("I. to Programming", 3) << endl; // Programming
    cout << wordn("I. to Programming", 4) << endl; //
    return 0;
}

// functions


string wordn(string s, int n)
{
    bool partOfWord(char c);

    string r;
    int cnt = 0, i = 0;
    bool onWord = false;
    while (i < s.size() and cnt <= n) {
        if (partOfWord(s[i])) {
            if (not onWord)
                cnt++;
            if (cnt == n)
                r += s[i];

            onWord = true;
        } else
            onWord = false;
        ++i;
    }
    return r;
}

bool partOfWord(char c)
{
    return (('A' <= c) and (c <= 'Z')) or
           (('a' <= c) and (c <= 'z'));
}