1. Learning Intention
I will learn about the standard algorithm for input validation.

2. Analysis
Design
Implementation
Testing
Documentation
Evaluation

3. Standard Algorithms
An algorithm is a step-by-step procedure for solving a problem in a finite number of steps.
Any bit of written code that carries out a specific task could be said to be an algorithm.

4. A program to add two test marks together is to be created
A program to add two test marks together is to be created. Both tests are marked out of 20. Normal Test Data: Extreme Test Data: Exceptional Test Data:
1 -> 19
0, 20
-1, 21

5. A program to add two test marks together is to be created
A program to add two test marks together is to be created. Both tests are marked out of 20.

6. Standard Algorithm - Input Validation
Input validation is used to check that input to the program is acceptable.
Validating input is a specific task that is used in lots of programs so it is called a standard algorithm.

7. Input Validation Example
A program to enter a users age: SEND “Enter an age (range )” TO DISPLAY RECEIVE age FROM (INTEGER) KEYBOARD SEND “You are “ & age & “ years old” TO DISPLAY

8. Input Validation – Example 1
SEND “Enter an age (range )” TO DISPLAY RECEIVE age FROM (INTEGER) KEYBOARD WHILE age ˂ 0 OR age ˃ 130 DO SEND “Invalid. Try again” TO DISPLAY END WHILE SEND “You are “ & age & “ years old” TO DISPLAY

9. Input Validation – Example 2
REPEAT SEND “Enter an age (range )” TO DISPLAY RECEIVE age FROM (INTEGER) KEYBOARD IF age < 0 OR age > 130 THEN SEND “Invalid. Try again” TO DISPLAY END IF UNTIL age >= 0 AND age <= 130 SEND “You are “ & age & “ years old” TO DISPLAY

10. Standard Algorithm - Input Validation
Input validation can be added to any program that is accepting input, even inside another loop (fixed or conditional).

11. What did this program do?
SET total TO 0 REPEAT RECEIVE number FROM KEYBOARD SET total TO total + number SEND total TO DISPLAY UNTIL total > 100

12. Over 100 (with each number <= 20)
SET total TO 0 REPEAT RECEIVE number FROM KEYBOARD IF number > 20 THEN SEND “number too big” TO DISPLAY END IF UNTIL number <= 20 SET total TO total + number SEND total TO DISPLAY UNTIL total > 100

13. Programming Tasks Complete the programming tasks on pages 73-75
Extension Sets 6 & 6b

14. Success Criteria
I can create an input validation algorithm using a conditional loop.