#include <iostream.h>

// file: diamondsp.cc
// using user-defined functions
// functions calling functions
// not defined before using
// using prototype statements

void Diamond2(void);
void Diamond(void);
void Mond(void);
void Dia(void);

int main()
{
   Diamond2();

   return 0;
}

void Diamond2()
{
   Diamond();
   Diamond();
}

void Diamond()
{
	Dia();
	Mond();
}

void Mond()
{
	cout << " ***** " << endl;
	cout << "  ***  " << endl;
	cout << "   *   " << endl;
}

void Dia()
{
	cout << "   *   " << endl;
	cout << "  ***  " << endl;
	cout << " ***** " << endl;
	cout << "*******" << endl;
}

Sample output:

<diamondsp
>   *   
>  ***  
> ***** 
>*******
> ***** 
>  ***  
>   *   
>   *   
>  ***  
> ***** 
>*******
> ***** 
>  ***  
>   *