Trouble using a loop to compare array contents

Hi,

I am trying to write a program which prompts the user to enter numbers which are then stored into an array. The first number is stored in the 'left' ie: [0], the second number is stored on the 'right' ie: [1], then 'left' again ie: [2], followed by 'right' ie: [3] and so on.

This continues until the array[8] is full.

I have managed this, but then after, using a separate loop I have to loop through the data items in the array and compare the 'Left' and 'Right' values. If 'left'[0] is bigger than 'right'[1], I have to cout "Left is bigger" else "Right is bigger".

My problem is incrementing a variable so that it changes from comparing [0] and [1] to moving onto comparing [2] and [3], and so on until the end of the array is reached.

I believe I can copy each individual stored value from the array into other separate variables, but I'm of the belief that this way is 'wrong'.

Here is my code:-

Code:

---


int main()
{
        // Clear the Gwin window
        Gwin.clear();

        double arrayname[8];

        int loopcount = 0;
        int index = 0;


        while (loopcount < 5 )
        {
                Gwin.writeText (10,50,"Enter Left \n"); //Prompt user for number
                arrayname[index] = Gwin.getDouble(); //put number into array
                index++;

                Gwin.writeText (10,70,"Enter Right \n"); //Prompt user for number
                arrayname[index] = Gwin.getDouble(); //put number into array
                index++;

                loopcount++;
        }

       
        int indexleft = 0;
        int indexright = 1;

        //SECOND (PROBLEM) PART BELOW:-

        while (loopcount < 10)
        {
                if (arrayname[indexleft]> arrayname[indexright] )
                {
                        Gwin.writeText (10,100,"Left is bigger");
                }

                else
                { 
                        Gwin.writeText (10,100,"Right is bigger");
                }
                        indexleft ++;
                        indexright ++;
                        loopcount++;
        }
}

        Keyboard.getch();
       

        return 0;

---

The Gwin lines may be unknown to anyone, as this is a libary we use in class, in my program it is just cout <<"Tell user to enter a value" and cin >> "Enter the value into the array".

So basically, I need to create a loop with compares values within the array, until all the 'lefts' and have been compared to the 'rights'.

Hope this makes sense.

Many thanks.

Swerve.

Here's your code, properly indented. Hopefully, you can see your error:

Code:

---

        while (secondloopcount < 9)
        {
                if (arrayname[indexleft]> arrayname[indexright] )
                {
                        Gwin.writeText (10,100,"Left is bigger");

                        else
                        Gwin.writeText (10,100,"Right is bigger");
                        indexleft ++;
                        indexright ++;
                        secoundloopcount++;
                }
        }

        Keyboard.getch();
       

        return 0;

---

Surely you are getting a compile error.

Todd

Code:

---


      while (loopcount < 10)
        {
                if (arrayname[indexleft]> arrayname[indexright] )
                {
                        Gwin.writeText (10,100,"Left is bigger");
                }


                        else
                  {
                        Gwin.writeText (10,100,"Right is bigger");
                  }
                        indexleft ++;
                        indexright ++;
                        loopcount++;
                }
        } //end of main bracket

        Keyboard.getch();
       

        return 0;

---

Thank you Todd :)

I have placed the { } brackets correctly. (Hope that was the error you were referring to).

My main problem is the looping through the array contents so I can compare them.

Thanks!

Since there are 4 pairs, and you are looking at a pair at a time, how many times does the second loop need to iterate?

Todd

4 times.

[0] compared to [1]
[2] to [3]
[4] to [5]
[6] to [7]

I have just removed the variable 'secondloopcount' and instead continued to use the first 'loopcount' one.

During the second loop I've set it to stop once (loopcount < 10) is false