NCERT Computer Science Class #11 – Chapter #6 Solutions – Q #14

Chapter #6 – Flow of Control

Class 11 – Chapter 6 Solutions – PROGRAMMING EXERCISES #9

(i) Write a program to print the following patterns:

          *
        * * * 
      * * * * *
        * * * 
          * 

Python Program:

def print_pattern():
    # Define the number of rows for the upper part of the pattern
    rows = 3

    # Upper part of the pattern
    for i in range(rows):
        # Print leading spaces
        print(" " * (rows - i - 1), end="")
        # Print stars with spaces
        if i == 2:  # For the third row, print 4 stars
            print("* " * 4)
        else:
            print("* " * (2 * i + 1))

    # Lower part of the pattern
    for i in range(rows - 1):
        # Print leading spaces
        print(" " * (i + 1), end="")
        # Print stars with spaces
        print("* " * (2 * (rows - i - 1) - 1))

# Call the function to print the pattern
print_pattern()

(ii) Write a program to generate below pattern:

                      1
                    2 1 2
                  3 2 1 2 3 
                4 3 2 1 2 3 4 
              5 4 3 2 1 2 3 4 5 

Python Program:

def print_pattern(n):
    for i in range(1, n + 1):
        # Print leading spaces
        print(" " * (n - i) * 2, end="")  # Multiply by 2 for better alignment

        # Print descending numbers
        for j in range(i, 0, -1):
            print(j, end=" ")

        # Print ascending numbers
        for j in range(2, i + 1):
            print(j, end=" ")

        # Move to the next line after each row
        print()

# Set the number of rows for the pattern
rows = 5
print_pattern(rows)

(iii) Write a program to generate below pattern:

        1 2 3 4 5
          1 2 3 4 
            1 2 3 
              1 2
                1

Python Program:

def print_pattern(n):
    for i in range(n):
        # Print leading spaces
        print(" " * (2 * i), end="")  # Multiply by 2 for better alignment

        # Print numbers from 1 to n-i
        for j in range(1, n - i + 1):
            print(j, end=" ")

        # Move to the next line after each row
        print()

# Set the number of rows for the pattern
rows = 5
print_pattern(rows)

NCERT Computer Science Class 11 Chapter 6 Solutions Q 14