Program to print the odd number pattern 13579 3579 579 79 9

Programming Example

Program to print the odd number pattern

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📘 Step by Step Learning

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

Program Code

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

#include <stdio.h>

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

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

    for(i=1; i<=N; i++)
    {
        k = (i * 2) - 1;

        // Logic to print numbers
        for(j=i; j<=N; j++, k+=2)
        {
            printf("%d", k);
        }

        printf("\n");
    }

    return 0;
}

Output

Output
Enter N: 5
13579
3579
579
79
9

Explanation

Logic to print the given number pattern

If you look to the pattern you will find that the pattern only consists of odd numbers. There are N rows (where N is the total number of rows to be printed). As you can see that each row contains exactly N - i + 1 columns (where i is the current row number).
For printing the numbers we will be using an extra variable lets say k that will keep track of next odd number. For each row odd number starts with the expression i * 2 - 1.

Step-by-step descriptive logic:

To iterate through rows, run an outer loop from 1 to N.
Inside this outer loop, initialize variable k = i * 2 - 1 (where k is used to keep track of next odd number to be printed).
To iterate though columns, run an inner loop from i to N (where i is the current row number).
Inside this loop print the value of k and increment it to k = k + 2.

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.

Program to print the odd number pattern
13579 3579 579 79 9