#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;

void add5(int& i);
void getGrade(int pct, char& gr);
void open(ofstream& fout);
void MrOrMs(string& name, char gender);
void longWords(ifstream& fin, string& str);


int main()
{
    int x = 99;
    add5(x);
    cout << x << endl;

    char grade;
    getGrade(75,grade);
    cout << grade << endl;
    getGrade(105,grade);
    cout << grade << endl;

    ofstream fout;
    cout << "The file is " << (fout.is_open() ? "" : "not ") << "open\n";
    open(fout);
    cout << "The file is " << (fout.is_open() ? "" : "not ") << "open\n";

    string name = "Joe Bentley";
    MrOrMs(name,'M');
    cout << name << endl;

    ifstream fin("nov12.txt");
    if (!fin)
    {
        cerr << "Can't open nov12.txt\n";
        exit(1);
    }
    string longstring;
    longWords(fin,longstring);

    cout << endl << longstring << endl;

}

// Write a file that reads words from a file and adds the words to a string if the word is more than 5 characters
void longWords(ifstream& fin, string& str)
{
    string buffer;
    while (fin >> buffer)
    {
        if (buffer.size()>5) str += buffer + '\n';
    }
}

void MrOrMs(string& name, char gender)
{
    if (gender == 'M')
        name = "Mr. " + name;
    else
        name = "Ms. " + name;
}

// Write a function that opens a file for output, given an ofstream object
void open(ofstream& fout)
{
    string name;
    cout << "what's the file name? ";
    cin >> name;
    fout.open(name);
}


// Write a function that "populates" a grade variable, given a percent
void getGrade(int pct, char& gr)
{
    switch (pct/10)
    {
    case 10:       // "fall through"
    case 9:
        gr = 'A';
        break;
    case 8:
        gr = 'B';
        break;
    case 7:
        gr = 'C';
        break;
    case 6:
        gr = 'D';
        break;
    default:
        gr = 'F';
    }
}



// Write a function that adds 5 to a given int
void add5(int& i)
{
    i += 5;
}