C++ Array Question

[ne0c0de]

Hi All

I purchased the jumping into C++ and i am a beginner. I now reached the array section which is sorting arrays.

The code below as follows:

#include <iostream>
#include <ctime>
#include <cstdlib>


using namespace std;


int lowest_value_in_array ( int myArray[], int sizeofArray, int indexofArray );


void Do_Swap ( int myArray [], int firstindex, int secondindex);


//////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////
void Do_Sort ( int myArray [], int sizeofArray)
{
    for ( int i = 0; i < sizeofArray; i++ )
    {
        int indexofArray = lowest_value_in_array( myArray, sizeofArray, i );
        Do_Swap ( myArray, i, indexofArray );
    }
}
////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////




int lowest_value_in_array( int myArray[], int sizeofArray, int indexofArray )
{
    int indexofsmallestvalue = indexofArray;
    for ( int i = indexofArray + 1; i < sizeofArray; i++ )
    {
        if ( myArray[i] < myArray[indexofsmallestvalue])
        {
            indexofsmallestvalue = i;
        }
    }


    return indexofsmallestvalue;
}




void Do_Swap (int myArray[], int firstindex, int secondindex)
{
    int temp = myArray[firstindex];
    myArray[firstindex] = myArray[secondindex];
    myArray[secondindex] = temp;
}


void displayArray (int myArray[], int sizeofArray)
{
    cout << "{";


    for (int i = 0; i < sizeofArray; i++)
    {
        if (i != 0)
        {
            cout << ", ";
        }


        cout << myArray[i];
    }
    cout << "}";
}




int main()


{
    int myArray [10];
    srand (time (NULL));


    for (int i = 0; i < 10; i++)
    {
        myArray[i] = rand() % 100;
    }


    cout << "Original Array: ";


    displayArray(myArray, 10);
    cout << "\n";


    Do_Sort (myArray, 10);


    cout << "Sorted Array: ";


    displayArray(myArray, 10);


    cout << "\n";
}

My question is indexofArray is not set to zero and on some they have weird values other than zero and also the loop starts with
"indexofArray + 1"

How does the value "indexofArray" set to zero.

Please help !!!

[Elysia]

indexofArray is an argument which is passed into the function. It tells the function where to start looking.