CIS115 Week 4 Lab Overview

Title of Lab: Multiplication Table in Python

Summary

This week's lab is to create a simple multiplication table using nested loops and if statements.

Prompt the user for the size of the multiplication table (from 2x2 to 10x10). Use a validation loop to display a warning if the number is less than 2 or greater than 10 and prompt the user to enter the data again until they enter a valid number.

Put a # after any even number in your table (odd numbers will have just a space/nothing after them).

Deliverables

• A source code Python file.
• A Word document containing both source code and the screen print of the program outputs.

Lab Steps

Sample Output:

The output should be something similar to the following.

What size multiplication table would you like? (2 - 10): 1

Invalid entry - Enter a number between 2 and 10

What size multiplication table would you like? (2 - 10): 15

Invalid entry - Enter a number between 2 and 10

What size multiplication table would you like? (2 - 10): 10

--- Multiplication Table ( 10 x 10 ) ---

 1 2 3 4 5 6 7 8 9 10

---------------------------------------------------------------------------

1 | 1 2 # 3 4 # 5 6 # 7 8 # 9 10 #

2 | 2 # 4 # 6 # 8 # 10 # 12 # 14 # 16 # 18 # 20 #

3 | 3 6 # 9 12 # 15 18 # 21 24 # 27 30 #

4 | 4 # 8 # 12 # 16 # 20 # 24 # 28 # 32 # 36 # 40 #

5 | 5 10 # 15 20 # 25 30 # 35 40 # 45 50 #

6 | 6 # 12 # 18 # 24 # 30 # 36 # 42 # 48 # 54 # 60 #

7 | 7 14 # 21 28 # 35 42 # 49 56 # 63 70 #

8 | 8 # 16 # 24 # 32 # 40 # 48 # 56 # 64 # 72 # 80 #

9 | 9 18 # 27 36 # 45 54 # 63 72 # 81 90 #

10 | 10 # 20 # 30 # 40 # 50 # 60 # 70 # 80 # 90 # 100 #

Hints:

• The outer loop will start each new row.
• The inner loop will control the display of each column in the row.
• Note that to keep the numbers right-aligned, there are different amounts of space before single digit numbers (those less than 10), double digit numbers (those between 10-99), and triple digit numbers (100).
• The row labels can be added to your inner loop (note that there are different amounts of space required after the number in the row labels.
• The column labels should use a separate loop(s) that run before the main outer loop.
• You can continue printing on the same line using end="" in your print statement. This will come in handy if you want to print several things on one line inside a loop. For example, assuming the value of name is Ada, the following will print "Hello Ada" on one line:

print("hello ", end="")

print(name, end="")

Tips:

• Start early!
• Do the basic table first without worrying about spacing or lining things up, and don't include row or column headings (add those later).
• Once you get the numbers in the correct position, think about adding the proper amount of space before each number to line things up.
• Once the columns line up, add the #/space for even/odd numbers.
• Once the basic table is working, then add the row and column headings, and finally the main title.
• Test as you go!