C Program to Print 1-212-32123 Triangle (Pyramid) Pattern

In this program, we generate pyramid like triangle pattern using numbers. And numbers have pattern like this: 1 in first line, 212 in second line, 32123 in third line and so on.

Numeric Pyramid Pattern C Program

#include<stdio.h>

int main()
{
    int i,j,row;

    printf("Enter number of rows: ");
    scanf("%d",&row);

    for(i=1;i<=row;i++)
    {
        for(j=1;j<=row-i;j++)
        {
            printf(" ");
        }

        for(j=i;j>=1;j--)
        {
            printf("%d", j);
        }

        for(j=2;j<=i;j++)
        {
            printf("%d", j);
        }
        printf("\n");
    }

    return 0;
}

Output of above program

Enter number of rows: 8
       1
      212
     32123
    4321234
   543212345
  65432123456
 7654321234567
876543212345678

Another Method

#include<stdio.h>
#include<math.h>

int main()
{
    int i,j,row;

    printf("Enter number of rows: ");
    scanf("%d",&row);

    for(i=1;i<=row;i++)
    {
        for(j=1;j<=row-i;j++)
        {
            printf(" ");
        }

        for(j=-i;j<=i;j++)
        {
            if(j==0||j==1)
            {
                continue;
            }
            printf("%d", abs(j));
        }

        printf("\n");
    }

    return 0;
}

Output of above program

Enter number of rows: 6
       1
      212
     32123
    4321234
   543212345
  65432123456