Warning: Source file not compiled

[MC Rath]

This program ran completely fine until I added the for loop into main. It still compiles with no errors, but when I try to run it, I get a pop up window saying "Warning: Source file not compiled". I've never seen a problem like this and googleing it has not helped me. If anyone could talk me through things that cause an error like this it would be greatly appreciated.

//DISPLAY 7.12 Sorting an Array 
//Tests the procedure sort.
#include <iostream>
using namespace std;
 
void fill_array(int a[], int size, int& number_used);
//Precondition: size is the declared size of the array a.
//Postcondition: number_used is the number of values stored in a.
//a[0] through a[number_used - 1] have been filled with
//nonnegative integers read from the keyboard.

void sort(int a[], int number_used);
//Precondition: number_used <= declared size of the array a.
//The array elements a[0] through a[number_used - 1] have values.
//Postcondition: The values of a[0] through a[number_used - 1] have
//been rearranged so that a[0] <= a[1] <= ... <= a[number_used - 1].

void swap_values(int& v1, int& v2);
//Interchanges the values of v1 and v2.

int index_of_smallest(const int a[], int start_index, int number_used);
//Precondition: 0 <= start_index < number_used. Referenced array elements have 
//values.
//Returns the index i such that a[i] is the smallest of the values
//a[start_index], a[start_index + 1], ..., a[number_used - 1].


int main( )
{
    cout << "This program sorts numbers from lowest to highest.\n";
    
    int sample_array[20], number_used;
    fill_array(sample_array, 20, number_used);
    sort(sample_array, number_used);

    cout << "In sorted order the numbers are:\n";
    for (int index = 0; index < number_used; index++)
    cout << sample_array[index] << " ";
    cout << endl;
    

    cout << "The smallest number is: " << sample_array[0] << endl;
    cout << "The largest number is: "  << sample_array[number_used-1] << endl;
    
    int total = 0;
     
     for (int i = 0; i < total; i++)
    {
        total = total + sample_array[i];
    }
    
    cout << "The average is: " << total/number_used << endl;
   
    system("PAUSE");
    return 0;
}

//Uses iostream:
void fill_array(int a[], int size, int& number_used)
{
    using namespace std;
    cout << "Enter up to " << size << " nonnegative whole numbers.\n"
         << "Mark the end of the list with a negative number.\n";
    int next, index = 0;
    cin >> next;
    while ((next >= 0) && (index < size))
    {
        a[index] = next;
        index++;
        cin >> next;
    }

    number_used = index;
}
void sort(int a[], int number_used)
{
    int index_of_next_smallest;

    for (int index = 0; index < number_used - 1; index++)
    {//Place the correct value in a[index]:
        index_of_next_smallest =
                     index_of_smallest(a, index, number_used);
        swap_values(a[index], a[index_of_next_smallest]);
        //a[0] <= a[1] <=...<= a[index] are the smallest of the original array 
        //elements. The rest of the elements are in the remaining positions.
    }
}


void swap_values(int& v1, int& v2)
{
    int temp;
    temp = v1;
    v1 = v2;
    v2 = temp;
}


int index_of_smallest(const int a[], int start_index, int number_used)
{
    int min = a[start_index],
        index_of_min = start_index;
    for (int index = start_index + 1; index < number_used; index++)
        if (a[index] < min)
        {
            min = a[index];
            index_of_min = index;
            //min is the smallest of a[start_index] through a[index]
        }

    return index_of_min;
}

[mutexe]

works fine for me. what ide are you using?

[MC Rath]

I'm sorry. I'm pretty new to this. What does ide stand for?

[OxBADC0DE]

Integrated Development Environment. An interactive environment that allows you to edit(and compile, in most cases) your source. Examples are Code::Block, MS Visual Studio, BloodShed DevC++, Eclipse, Notepad++ e.t.c

[MC Rath]

Oh. Thank you. I'm using Dev C++.

[Chervil]

I hope it isn't the Bloodshed version. That is an obsolete, abandoned project and it should not be recommended at all.

The correct Dev C++ is the Orwell version - this is fine, both the IDE and the compiler are maintained up to date.
http://orwelldevcpp.blogspot.co.uk/

[MC Rath]

It is the bloodshed version. That's what our instructor recommended to us, although I don't know why since you say that it is obsolete. I will switch and hopefully that will help.

[3CXz8vqX]

It's been a while since I have heard of anyone using Bloodshed as far as I'm aware it hasn't had majority support for a long long time due to a lot of bugs. I haven't tried the Orwell IDE though.

[Chervil]

The last update to the Bloodshed version was in 2005. In fact if you follow the download links to sourceforge, there are several places where it is stated: "This project has been superseded by http://sf.net/projects/orwelldevcpp/"