Write a python function proddigits() that inputs a positive integer number and returns the product of digits of that number.

Here's the Python function `proddigits()` that takes a positive integer as input and returns the product of its digits:

def proddigits(num):
    # Initialize product to 1
    product = 1 
    
    # Convert the integer to a string to loop through its digits
    num_str = str(num)
    
    # Loop through each digit in the string
    for digit in num_str:
        # Multiply the digit to the current product
        product *= int(digit)
    
    # Return the final product
    return product

You can call this function with a positive integer as an argument and it will return the product of its digits. Here's an example usage:

num = 12345
product = proddigits(num)
print(product) # Output: 120

In this example, the input integer is 12345 and the product of its digits is 1 x 2 x 3 x 4 x 5 = 120.