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;
}
C++ Program to Print Diamond Number Pattern

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

About Suresh

Suresh is the founder of TutorialGateway and a freelance software developer. He specialized in Designing and Developing Windows and Web applications. The experience he gained in Programming and BI integration, and reporting tools translates into this blog. You can find him on Facebook or Twitter.