C++ Program to Print Diamond Number Pattern

Write a C++ program to print the diamond number pattern using for loop.

#include<iostream>
using namespace std;

int main()
{
	int i, j, k, rows;
     
    cout << "Enter Diamond Number Pattern Row = ";
    cin >> rows;

    cout << "Diamond Number Pattern\n"; 

    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= rows - i; j++)
		{
            cout << " ";
        }
        for(k = 1; k <= i * 2 - 1; k++)
        {
            cout << k;
        }
        cout << "\n";
    }	

    for(i = rows - 1; i > 0; i--)
    {
    	for(j = 1; j <= rows - i; j++)
		{
            cout << " ";
        }
        for(k = 1; k <= i * 2 - 1; k++)
        {
            cout << k;
        }
        cout << "\n";
    }
	
 	return 0;
}

This C++ example is another way of printing the diamond pattern of numbers.

#include<iostream>
using namespace std;

int main()
{
	int i, j, k, l, rows;
     
    cout << "Enter Diamond Number Pattern Row = ";
    cin >> rows;

    cout << "Diamond Number Pattern\n"; 

    for(i = 1; i <= rows; i++)
    {
    	for(j = 1; j <= rows - i; j++)
		{
            cout << " ";
        }
        for(k = i; k >= 1; k--)
        {
            cout << k;
        }
        for(l = 2; l <= i; l++)
        {
            cout << l;
        }
        cout << "\n";
    }	

    for(i = rows - 1; i > 0; i--)
    {
    	for(j = 1; j <= rows - i; j++)
		{
            cout << " ";
        }
        for(k = i; k >= 1; k--)
        {
            cout << k;
        }
        for(l = 2; l <= i; l++)
        {
            cout << l;
        }
        cout << "\n";
    }	
 	return 0;
}

Enter Diamond Number Pattern Row = 9
Diamond Number Pattern
        1
       212
      32123
     4321234
    543212345
   65432123456
  7654321234567
 876543212345678
98765432123456789
 876543212345678
  7654321234567
   65432123456
    543212345
     4321234
      32123
       212
        1