#include <iostream>
#include <fstream>              // for ifstream
#include <string>
#include "prompt.h"

// find the longest word in a file specified by the user

int main()
{
    string word;                   // current word
	string maxword;				   // current longest word
    unsigned int maxlength = 0;             // length of current longest word
    ifstream input;
       
	string filename = PromptString("enter name of file: ");

    input.open(filename.c_str());  // bind input to named file
	if (input.fail())              // if filename is invalid
	{
		cout << "cannot open " << filename << endl;
		return 0;    //stop program
	}
     
    while (input >> word)                   // read succeeded
    {   
		if (word.length() > maxlength)      // if the next word in the file is the longest-so-far
		{
			maxlength = word.length();      // update maxýmum word length and
			maxword = word;                 // save the longest-so-far word
		}

    }
    
	if (maxlength != 0)
	{
		cout << "longest word is: " << maxword << endl << "and it has " 
			 << maxlength <<	" letters in it" <<endl;
	}
	else
	{
		cout << "file is empty" << endl;
	}
    
    return 0;
}