how do I reverse order of my array

How do I reverse the order of this array?

Jose

Code:

#include <iostream.h>
#include <stdlib.h>

const int myarraysize = 5;

void Fill_array(double myarray[], int j);
void Show_array(double myarray[], int j);
void Reverse_array(double myarray[], int j);

int main()
{
     cout << "starting in main" << endl;

     double uservalues[myarraysize] = {};

      Fill_array(uservalues, myarraysize);
      Show_array(uservalues, myarraysize);
      Reverse_array(uservalues, myarraysize);
      Show_array(uservalues, myarraysize);

      cout << "back in main" << endl;

      system("PAUSE");
      return 0;
}

void Fill_array(double myarray[], int j)
{
    cout << "I'm in Fill array" << endl;
    int numberofentries = 0;
    int counter = 0;

    for (int i = 0; i < j; i++)
        {
        cout << "Enter a value to be stored in array" << endl;
        cin >>  myarray[i];
        counter = counter + 1;
        }

    numberofentries = counter;
    cout << "Values you entered: " << numberofentries << endl;

}

void Show_array(double myarray[], int j)
{

    cout << "Now I'm in Show array" << endl;
    cout << "This is what you entered into the array" << endl;
    for (int i = 0; i < j; i++)
        {
        cout << myarray[i] << endl;
        }

}

void Reverse_array(double myarray[], int j)
{
    cout << "Now I'm in Reverse array" << endl;
    myarray[0] = myarray[4];
    myarray[1] = myarray[3];
    myarray[2] = myarray[2];
    //myarray[3] = myarray[4];
    //myarray[4] = myarray[3];

}

Traverse the array from the beginning until you reach the middle. Swap the first element with the last, second element with the second last etc...

Code:

void SwapValues(double* Value1, double* value2)
{
   double Temp = *Value1;
   *Value1 = *Value2;
   *Value2 = Temp;
}

void ReverseArray(double MyArray[], int SizeOfArray)
{
   for(int i = 0; i < (int)(SizeOfArray / 2); i++)
   {
      SwapValues(&MyArray[i], &MyArray[SizeOfArray - i - 1]);
   }
}

use a temporary variable to swap values:

Code:

void reverseArray(int * array, int num)
{
   int temp;
   int i;
   int number = num - 1;//assumes num is number of ints in array
   for(i = 0; i < num/2; i++, number--)
   {   
       temp = array[number]; 
       array[number] = array[i];
       arrary[i] = temp;
    }
}

Allow me to introduce something wonderful:

S T L !!!

Code:

#include <algorithm>

void ReverseArray(double* array, int size)
{
 std::reverse(array,array+size);
}

if you have access to STL, go for it! If you want to know what STL is doing, study the other two posts.

I believe this would work too (incomplete but you can fill in whats needed, which isn't much)-

Code:

for(y = (j-1); y >= 0; y--)
    {
         temparray[y] = myarray[x];
         x++;
    }
	for(x=0; x < j; x++)
    {
	   myarray[x] = temparray[x];
    }

There, that works. Fairly simple to understand, too, IMHO.

Thanks all that helped, I am newbie to C++ and am taking a college course this semester. This is my final working program.

God bless,
Jose

Code:

//Jose Gonzales, #c++04, 95

#include <iostream.h>
#include <stdlib.h>
const int myarraysize = 5;
int baddata = 0;

void Fill_array(double myarray[], int j);
void Show_array(double myarray[], int j);
void Reverse_array(double myarray[], double myrevarray[], int j);
void Swap_array(double myarray[], double myrevarray[]);

int main()
{

     double uservalues[myarraysize] = {};
     double uservaluesreverse[myarraysize] = {};


      cout << "\n";
      cout << "Enter " << myarraysize <<" double values to be stored in array" << flush << endl;
      Fill_array(uservalues, myarraysize);
      cout << "\n";

      if (baddata == 0)
      {
      cout << "This is what you entered into the array" << endl;
      Show_array(uservalues, myarraysize);
      cout << "\n";
      Reverse_array(uservalues, uservaluesreverse, myarraysize);
      cout << "Now here are your values in reverse order" << endl;
      Show_array(uservaluesreverse, myarraysize);
      cout << "\n";
      Swap_array(uservalues, uservaluesreverse);
      cout << "your values in reverse order all but 1st and last elements of array" << endl;
      Show_array(uservalues, myarraysize);
      }
      cout << "\n";
      cout << "\n";
      cout << "\n";
      cout << "\n";
      cout << "\n";

      system("PAUSE");
      return 0;
}

void Fill_array(double myarray[], int j)
{
    int numberofentries = 0;
    int counter = 0;

    for (int i = 0; i < j; i++)
        {
             if (!cin)
             {
             cin.clear();
             cout << "bad input, goodbye." << endl;
             cout << "\n";
             baddata = 1;
             break;
             }
             else
             {
             cin >>  myarray[i];
             counter = counter + 1;
             }
        }

    numberofentries = counter;
    cout << "total number of entries: " << numberofentries << endl;
}

void Show_array(double myarray[], int j)
{
    for (int i = 0; i < j; i++)
        {
        cout << myarray[i] << endl;
        }
}

void Reverse_array(double myarray[], double myrevarray[], int j)
{
    for (int i=0; i<j; i++)
        {
            myrevarray[i] = myarray[j - i -1];
        }
}

void Swap_array(double myarray[], double myrevarray[])
{
    myarray[1] = myrevarray[1];
    myarray[2] = myrevarray[2];
    myarray[3] = myrevarray[3];
}