[gabehabe]

What do I need to know before studying this tutorial?
You should have a knowledge of vectors and vector iterators

First off, what does fill() do?
Well, fill() does exactly what it says on the tin. It fills a vector with a specific value.

Before we begin, here is the general syntax for using the fill function:
fill (<where to begin filling from>, <where to stop filling>, <what to fill with>);

What do we need to include?

#include <iostream> // output the values to see what's going on
#include <algorithm> // our algorithm library
#include <vector> // we need a vector to use the algorithms on

using namespace std; // vectors and output

Next, we need to begin our int main () function. I'm gonna assume you know how to do this, and move on

Now we need to declare a vector and a vector iterator:

vector <int> myVec; // create a vector called myVec
vector <int> :: iterator it; // create a vector iterator called it

And then we want to fill and print the vector. Easy enough:

for (int i = 0; i < 9; ++i)
    myVec.push_back(i); // fill the vector with some values

cout << "Before fill: ";
for (it = myVec.begin(); it != myVec.end(); ++it)
    cout << *it << " "; // print the contents of myVec

Now for our "fill" function.

fill (myVec.begin(), myVec.end(), 5); // fill all values with the value '5'

All we need to do now is output the contents of the vector, and exit the program:

cout << endl << "After fill: ";
for (it = myVec.begin(); it != myVec.end(); ++it)
    cout << *it << " "; // print the contents of myVec again

cin.get (); // pause
return EXIT_SUCCESS; // everything went OK

Here's the complete code, for those of you who learn better by example alone:

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main ()
{
    vector <int> myVec; // create a vector called myVec
    vector <int> :: iterator it; // create a vector iterator called it

    for (int i = 0; i < 9; ++i)
        myVec.push_back(i); // fill the vector with some values

    cout << "Before fill: ";
    for (it = myVec.begin(); it != myVec.end(); ++it)
        cout << *it << " "; // print the contents of myVec

    fill (myVec.begin(), myVec.end(), 5); // fill all values with the value '5'

    cout << endl << "After fill: ";
    for (it = myVec.begin(); it != myVec.end(); ++it)
        cout << *it << " "; // print the contents of myVec again

    cin.get (); // pause
    return EXIT_SUCCESS; // everything went OK
}

[Amadeus]

This tutorial has been approved, as the information is factually correct. This, with other submissions, however, are really examples of some of the basic features of the algorithm header. Perhaps a more encompassing tutorials grouping several methods together might be beneficial.