Python Exercise: Generates a two-dimensional array

Last update on April 17 2025 12:58:29 (UTC/GMT +8 hours)

11. Two-Dimensional Array (Multiplication Table)

Write a Python program that takes two digits m (row) and n (column) as input and generates a two-dimensional array. The element value in the i-th row and j-th column of the array should be i*j.
Note :
i = 0,1.., m-1
j = 0,1, n-1.

Pictorial Presentation:

Sample Solution:

Python Code:

# Prompt the user to input the number of rows
row_num = int(input("Input number of rows: "))

# Prompt the user to input the number of columns
col_num = int(input("Input number of columns: "))

# Create a 2D list (a list of lists) filled with zeros using list comprehension
# The outer list will have 'row_num' elements and the inner lists will have 'col_num' elements
multi_list = [[0 for col in range(col_num)] for row in range(row_num)]

# Nested loop to populate the 2D list with multiplication results
for row in range(row_num):
    for col in range(col_num):
        # Set the value at position [row][col] in the 2D list to the product of 'row' and 'col'
        multi_list[row][col] = row * col

# Print the resulting 2D list containing the multiplication table
print(multi_list) 

Sample Output:

Input number of rows: 3                                                                                       
Input number of columns: 4                                                                                    
[[0, 0, 0, 0], [0, 1, 2, 3], [0, 2, 4, 6]] 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to create a 2D array where each element at position [i][j] equals i * j using nested list comprehensions.
• Write a Python program to generate a multiplication table for given row and column sizes provided by the user.
• Write a Python program to build a multiplication matrix using loops and then print it in a formatted grid.
• Write a Python program to create a dynamic 2D list that calculates the product of indices for each element and displays it.

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