Program to print the given number pattern 1 23 345 4567 56789

Programming Example

Program to print the given number pattern

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📘 Step by Step Learning

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

        // Logic to print numbers
        for(j=1; j<=i; j++, k++)
        {
            printf("%d", k);
        }

        printf("\n");
    }

    return 0;
}

Output

Enter N: 5
1
23
345
4567
56789

Explanation

Logic to print the given number pattern

Before I discuss logic to print the given number pattern, I recommend you that have a close look to the pattern carefully for a couple of minutes. The above pattern consists of N rows (where N is the total number of rows to be printed). Each row contains i columns (where i is the current row number). To print the above pattern we will be using an extra variable say k that will keep the value which we need to print.
Step-by-step descriptive logic:

To iterate through rows, run an outer loop from 1 to N.
Inside the outer loop initialize k = i (where k is an extra variable which will hold the number which we need to print next and i is the current row number).
To print the numbers, run an inner loop from 1 to i. Inside this loop print the value of k. Also increment the value of k after printing.

And you are done, lets implement this.

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 given number pattern
1 23 345 4567 56789