how can I complete this code ?, diamond shape

Hi, guys!
I have to write a program that prompts the user to enter an integer number for to draw a diamond.
The number would be longest part of the diamond.
I did upper part of the diamond but I cant continue the bottom part of the diamond.
could you please show me a way to complete the diamond ?
thanks in advance.

Code:

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

int main()
{
 b: int i,j,max,choose,min=1;
 char c;
            a: cout<<"Please enter a positive number so that we can draw a triangle; ";
              cin>>choose;

              if(choose<0)
{
              cout<<"You have entered a negative number please try again."<<endl;
              goto a;

}
              if(choose%2==0)
              choose --;
              max=choose;
              while(min<=choose)
{
              for(j=1;j<max;j++)
              cout<<" ";
              for(i=0;i<min;i++)
              cout<<"*";
              min += 2;
              max--;
              cout<<"\n";
 }
 cout<<"Do you wish to continue Y/N? \n";
 cin>>c;
 if(c=='Y' || c=='y' )

 goto b;

 system("PAUSE");
      return 0;
}

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Can you not simply reverse the loop?

reset the values of min and max
Create another while loop

Code:

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while ( min >= 0) { ... }

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Then work your way down
Something like

Code:

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              for(j=max;j > 1;j--)
              cout<<" ";
              for(i=min;i>0;i--)
              cout<<"*";

---

Also, I would work on indenting your code better as well as avoiding using goto statements as they are confusing and unnecessary.

Regards,

cs_student