Program to print the given number pattern 5 45 345 2345 12345

Programming Example

Program to print the given number pattern

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💻 Practical Program

📘 Step by Step Learning

Write a C program to print the given number pattern using for 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, N;

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

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

        printf("\n");
    }

    return 0;
}

Output

Enter N: 5
5
45
345
2345
12345

Explanation

Logic to print the given number pattern

In the above pattern there are N rows (where N is the total number of rows to be printed). As you know that to iterate N times, you can either go from 1-N or from N-1. Here in our case we will iterate though rows from N-1, since the pattern printed is in descending order. Each row contains exactly N - i + 1columns (where i is the current row number).
Step-by-step descriptive logic:

To iterate through rows, run an outer loop from N to 1 in decreasing order.
To print columns, run an inner loop from i to N (where i is the current row number). Inside this loop print the value of j (where j is the current column number).

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
5 45 345 2345 12345