Python: Find the product of the units digits in the numbers

Last update on May 30 2025 11:50:07 (UTC/GMT +8 hours)

Product of Units in List

Write a Python program to find the product of the units digits in the numbers in a given list.

Input:
[12, 23]
Output:
6

Input:
[12, 23, 43]
Output:
18

Input:
[113, 234]
Output:
12

Input:
[1002, 2005]
Output:
10

Visual Presentation:

Sample Solution-1:

Python Code:

# Define a function named 'test' that takes a list of numbers as input and calculates the product of their units digits
def test(nums):
    # Use list comprehension to extract the units digits of each number and join them as a string
    # Evaluate the resulting expression to get the product of the units digits
    return eval('*'.join([str(x % 10) for x in nums]))

# Create a list of numbers named 'nums'
nums = [12, 23]
# Print a message indicating the task and the original list of numbers
print("Original list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

# Create another list of numbers named 'nums'
nums = [12, 23, 43]
# Print a message indicating the task and the original list of numbers
print("\nOriginal list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

# Create yet another list of numbers named 'nums'
nums = [113, 234]
# Print a message indicating the task and the original list of numbers
print("\nOriginal list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

# Create one more list of numbers named 'nums'
nums = [1002, 2005]
# Print a message indicating the task and the original list of numbers
print("\nOriginal list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

Sample Output:

Original list of numbers:
[12, 23]
Product of the units digits in the numbers of the said:
6

Original list of numbers:
[12, 23, 43]
Product of the units digits in the numbers of the said:
18

Original list of numbers:
[113, 234]
Product of the units digits in the numbers of the said:
12

Original list of numbers:
[1002, 2005]
Product of the units digits in the numbers of the said:
10

Flowchart:

Sample Solution-2:

Python Code:

# Define a function named 'test' that takes a list of numbers as input and calculates the product of the absolute values of their units digits
def test(nums):
    # Initialize a variable 'prod' to 1 to store the product of units digits
    prod = 1
    # Iterate through each number in the list 'nums'
    for n in nums:
        # Update 'prod' by multiplying it with the absolute value of the units digit of the current number
        prod *= abs(n % 10)
    # Return the final product of the units digits
    return prod

# Create a list of numbers named 'nums'
nums = [12, 23]
# Print a message indicating the task and the original list of numbers
print("Original list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

# Create another list of numbers named 'nums'
nums = [12, 23, 43]
# Print a message indicating the task and the original list of numbers
print("\nOriginal list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

# Create yet another list of numbers named 'nums'
nums = [113, 234]
# Print a message indicating the task and the original list of numbers
print("\nOriginal list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

# Create one more list of numbers named 'nums'
nums = [1002, 2005]
# Print a message indicating the task and the original list of numbers
print("\nOriginal list of numbers:")
# Print the original list of numbers
print(nums)
# Print a message indicating the task and the result of the test function applied to 'nums'
print("Product of the units digits in the numbers of the said:")
# Print the result of the test function applied to 'nums'
print(test(nums))

Sample Output:

Original list of numbers:
[12, 23]
Product of the units digits in the numbers of the said:
6

Original list of numbers:
[12, 23, 43]
Product of the units digits in the numbers of the said:
18

Original list of numbers:
[113, 234]
Product of the units digits in the numbers of the said:
12

Original list of numbers:
[1002, 2005]
Product of the units digits in the numbers of the said:
10

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to compute the product of the last digit of each number in a list, treating negative numbers by their absolute values.
• Write a Python program to multiply the units digit of each number in a list while skipping numbers whose last digit is 0.
• Write a Python program to extract the units digit from each integer using a lambda function and then compute their product.
• Write a Python program to map each integer to its last digit and calculate their product modulo 10.

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