Number pattern 38 in C

Write a C program to print the given number pattern series. How to print the given number pattern series using for loop in C programming. Logic to print the given number pattern in C program.

Input N: 5

1
32
4543
567654
67898765

Required knowledge

Basic C programming, Loop

Logic to print the given number pattern

1
3 2
4 5 4 3
5 6 7 6 5 4
6 7 8 9 8 7 6 5

If at first the pattern seems confusing. Take your time and have a closer look to the pattern for a minute. You might find below things about the pattern.

1. It contains of total N rows (where N is the total number of rows to be printed).
2. To make things easier you can divide the pattern in two parts.

    
     
   4   
   56    
   678

   
   

   1
   32
    543
     7654
      98765

3. Now, when you look to the first part of the pattern, you will find that it starts from 3^rd row and goes till 5^th row. Hence the inner loop formation to print this part will be something like for(j=3; j<=i; j++).
4. The second pattern is an odd pattern, whose first column starts with an odd number. I have already explained the logic to print this pattern in one of my previous post.
   It contains total N rows and each row contains exactly i columns (where i is the current row number. Each column start with a value (i * 2) – 1. Hence the second inner loop formation for this part will be for(j=(i * 2)-1; j>=i; j–).

Lets, code down the logic.

Program to print the given pattern

/**
 * C program to print the given number pattern
 */

#include <stdio.h>

int main()
{
    int i, j, value, N;

    printf("Enter rows: ");
    scanf("%d", &N);

    for(i=1; i<=N; i++)
    {
        value = i + 1;
        // Prints the first part of pattern
        for(j=3; j<=i; j++)
        {
            printf("%d ", value);
            value++;
        }

        // Prints the second part of pattern
        for(j=(i*2)-1; j>=i; j--)
        {
            printf("%d ", j);
        }

        printf("\n");
    }

    return 0;
}

Enter rows: 5
1
3 2
4 5 4 3
5 6 7 6 5 4
6 7 8 9 8 7 6 5

Happy coding 😉