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

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 using loop. How to print the given triangular number pattern using for loop in C programming. Logic to print the given number pattern 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=N; i>=1; 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
56789
4567
345
23
1

Explanation

Logic to print the given number pattern

The above pattern consists of N rows (where N is the total rows to be printed). Now to iterate N times you can either go from 1-N or from N-1. Here in our case we will go from N-1 as the pattern printed is in decreasing order. Each row contains i columns (where i is the current row number). Note that the first row is row 5, second is 4 and so on last row is 1.
Step-by-step descriptive logic:

To iterate through rows, run an outer loop from N to 1 in decreasing order.
Inside the outer loop initialize another variable say k = i (where k is used to keep the value which is to be printed next).
To print columns, run an outer loop from 1 to i. Inside this loop print the value of k after that increment the value of k to get next value.

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
56789 4567 345 23 1