Diamond loopy

Hey guys iv made a program that makes diamond shape appear. It works fine
and the image is perfect. But I was wondering, I have broken the code into two
sections, the top and bottom half the shape. Is it possible to use a single loop
of deep nested for loops to make the shape appear any different and more cleaner than I have done?

All im looking for is pointers on my coding...

Code:

---

#include <iostream>

// main function - begins program execution ////////////////////////////////////
//
int main ( void )
{
  int spaces, stars;
 
  // top hslf of diamond
  for ( int line = 1; line <= 5; line++ )
  {
      spaces = abs ( line -5 );
     
      for ( int loop = 1; loop <= spaces; loop++ )
        std::cout << " ";
        stars = line + ( line -1 );
       
      for ( int loop = 1; loop <= stars; loop++ )
        std::cout << "*";
        std::cout << std::endl;
     
  }
 
  // bottom half of diamond
  for ( int line = 1 ; line <= 4; line++ )
  {
      spaces = line;

      for ( int loop = 1; loop <= spaces; loop++ )
        std::cout << " ";
        stars = 9 - 2 * spaces;

      for ( int loop = 1; loop <= stars; loop++ )
        std::cout << "*";
        std::cout << std::endl;
  }

  std::cin.get(); // freeze console output window
 
  return 0; // return value from int main
}

---

There is a "cleaner" solution using standard I/O manipulators, namely to set the fill character and the field width. I am not sure how to combine the two parts into a single loop.

Code:

---

#include <iostream>
#include <string>

int main()
{
    for( int i = 0; i < 9; ++i )
        std::cout << std::string(abs(4-i),' ') << std::string(9-2*abs(4-i),'*') << std::endl;

    return 0;
}

---