Calculating PIN codes

Implement a program that reads three integer values: day, month, and year of a person’s birth. Using this data, the program should show a four-digit PIN associated with the date of birth. The PIN is calculated as:

1. p1 = (d1 + d2)% 10.

2. p2 = (m1 + m2)% 10.

3. p3 = (y1 + y4)% 10.

4. p4 = (y2 + y3)% 10.

For example, if the date entered is 29 9 1975, the PIN would be 1 9 6 6:

1. p1 = (2 + 9)% 10 = 1.

2. p2 = (0 + 9)% 10 = 9.

3. p3 = (1 + 5)% 10 = 6.

4. p4 = (9 + 7)% 10 = 6.

>>> %Run 
    Enter your day of birth: 29
    Enter your month of birth: 9
    Enter your year of birth: 1975
    Your PIN is 1 9 6 6 

test case ID	inputs			expected output (PIN)
	day	month	year
1	10	12	1522	1 3 7 2
2	1	1	1	1 1 1 0
3	27	3	1978	9 3 9 6
4	55	28	300	0 0 0 3
5	356	903	1568	1 3 9 1

Look at test cases 4 and 5. Are they valid? Inputs 55 and 356 are not valid numbers for a day of birth. However, our program works and calculates a PIN. Python does not know what birthdays are and when they are valid. For Python the 3 inputs are simply whole numbers. If we want our program not to calculate a PIN when the date is not valid, then we should add conditions that verify the inputs. We will see how we can do it in the next thematic unit with decision statements like if - then - else.

A table with test cases was added and the student were made aware of
the test cases that not really contained valid dates but still
calculated a PIN number.