Python Program to Print Number Ladder Pattern

Introduction

A number ladder pattern is a sequence of numbers printed in the form of a ladder, where the numbers increase continuously as you go down the rows. This exercise helps in understanding how to use loops to control the printing of numbers in a ladder format.

Problem Statement

Create a Python program that:

• Accepts the number of rows for the ladder.
• Prints a number ladder pattern where the numbers increase as you move down the rows.

Example:

• Input: rows = 5
• Output:

  1
  2 3
  4 5 6
  7 8 9 10
  11 12 13 14 15
  

Solution Steps

1. Input the Number of Rows: The user specifies how many rows the ladder should have.
2. Use Nested Loops: The outer loop controls the rows, and the inner loop handles printing the numbers in each row.
3. Display the Number Ladder: Continuously print numbers, incrementing them in each row.

Python Program

# Step 1: Input the number of rows for the number ladder
rows = int(input("Enter the number of rows: "))

# Step 2: Initialize a counter for the numbers
num = 1

# Step 3: Outer loop for rows
for i in range(1, rows + 1):
    # Step 4: Inner loop to print numbers in each row
    for j in range(1, i + 1):
        print(num, end=" ")
        num += 1
    # Move to the next line after each row
    print()

Explanation

Step 1: Input the Number of Rows

• The program starts by asking the user for the number of rows, which defines how many levels the number ladder will have.

Step 2: Initialize a Counter

• A variable num is initialized to 1, which keeps track of the numbers being printed. It will be incremented after each number is printed.

Step 3: Outer Loop for Rows

• The outer loop controls how many rows are printed, running from 1 to rows.

Step 4: Inner Loop for Numbers in Each Row

• The inner loop prints the numbers in each row. The number of numbers printed increases with each row, and the counter num is incremented after each print.

Output Example

For rows = 5, the output will be:

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

For rows = 4, the output will be:

1
2 3
4 5 6
7 8 9 10

Conclusion

This Python program prints a number ladder pattern using nested loops. The numbers are printed in increasing order, and the number of numbers in each row increases with each row. This exercise helps in practicing loops, number control, and formatting output in Python.