Numeric 1-121-12321 Pyramid Pattern

In this program, we use numbers to generate a pyramid-like pattern. And numbers follow a pattern similar to this: 1 in the first line, 121 in the second line, 12321 in the third line, and so on.

Program code:

#include <iostream>
using namespace std;
void pattern(int n)
{ int i,j;
	for(i=1;i<=n;i++)
    {
        for(j=1;j<=n-i;j++)
        {
            cout<<" ";
        }

        for(j=1;j<=i;j++)
        {
            cout<<j;
        }

        for(j=i-1;j>=1;j--)
        {
            cout<<j;
        }
        cout<<"\n";
    }
}

// Driver Function
int main()
{
	int n = 5;
	pattern(n);
	return 0;
}

Output:

    1
   121
  12321
 1234321
123454321

Note: also read about Pattern Program Using Star

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