explain

Here is a very simple program that counts words and other things in a document. Some of this code I got help on. I am pretty new to C++ and I was wondering if someone can explain something to me. Here is the code:

#include <fstream.h>
#include <iostream.h>
#include <ctype.h>
#include <conio.h>
#include <stdlib.h>

int main()
{
int letters = 0, digits = 0, words = 0, puncts = 0, others = 0, average = 0;
char ch;
ifstream txtdoc;

txtdoc.open("a:computer.txt");
if(txtdoc.fail())
{
clrscr;
//goto(26,11);
cout<< "File not found!!! Exiting...........";
exit(1);
}
else
{
clrscr;
//goto(26,11);
cout<< " File has been successfuly opened!";
}
txtdoc.get(ch);
while(!txtdoc.eof())
{
while((isspace(ch) || isdigit(ch) || ispunct(ch)) && !txtdoc.eof())
{
if(isdigit(ch))
digits++;
else
if(ispunct(ch))
puncts++;
else
others++;
txtdoc.get(ch);
}
if (!txtdoc.eof())
words++;
while(isalpha(ch) && !txtdoc.eof())
{
letters++;
txtdoc.get(ch);
}
}

average = (letters/double(words) + 0.5);

txtdoc.close();
//goto(26, 13);
cout<< "Number of letters = " << letters << endl << endl;
//goto(26, 15);
cout<< "Number of digits = " << digits << endl << endl;
//goto(26, 17);
cout<< "Number of words = " << words << endl << endl;
//goto(26, 19);
cout<< "Number of punctuation characters = " << puncts << endl << endl;
system("PAUSE");
return 0;
}


My question is : how does it count the words? All I see is
"if (!txtdoc.eof())
words++; "
but how does it tell words appart?

My second question is how to do the function of gotoxy (which positions the cursor at a given position on the screen) on dev.?

Thanks in advance;

Konrad

That's what all the lines of code before and after the code you cited does. Here are some questions for you to consider:

1) What does ch have to be in order to reach the lines you cited?
2) What do the lines after the lines you cited do?