1. Subject: Information Technology Grade: 10
Topics:
Selection Statements

2. Processing Involving Selecting Instructions
An instruction that allows deviation and selection to take place uses the ‘IF’ command.
The IF statement contains a condition that is made up of three parts:
Variable to be tested
Relational operator
Variable or constant to which the variable to be tested is compared to.

3. Relational Operators

4. If statements: IF-THEN IF-THEN-ELSE Flowchart Symbols:
Decision making and branching
Connector or joining two parts of a program.
It is also used to connect sections of a flowchart when a flowchart is long and cannot fit on a page. A letter or digit can be placed in the small circle to indicate the link on the first page. Another identically labeled connector is placed on the next page to indicate the continuation of flow.

5. IF-THEN Pseudocode IF (condition) then
When one option is available and a selection may or may not be made, the IF-THEN is used.
Pseudocode
IF (condition) then
One or more instructions which will be carried out if the condition is true
ENDIF

6. Flowchart no
yes
Condition
Statement - True

7. Examples IF-THEN Problem 1:
If a student’s grade is greater than 85%, then she is given 3 merits.
Solution:
Pseudocode
IF (grade > 85) then
merit = 3
ENDIF
Flowchart no
yes
grade > 85
merit = 3

8. Problem 2:
Read the time. If the time is 11:00, output “Ring the bell”.
Solution
Pseudocode
Read time
IF (time = 11) then
Print “Ring the bell”
ENDIF
Flowchart
Students is required to do the flowchart

9. Problem 3:
Write a program to read a number N. If N is greater than or equal to 100, add 10 to the number and display the result. Print the number.
Requirements:
Write the Pseudocode
Draw the flowchart

10. Pseudocode Start Declare N, result as Integer
Print “A program that accepts a number, and if the number is greater than 100 then 10 is added to the number.”
Print “Enter a number: ”
Read N
IF (N >= 100) then
result = N + 10
Print “Result is ” result
ENDIF
Print “Number is ” N
Stop

11. Print “Result is ”, result
Flowchart
START
STOP
Print “Enter a number”
Read N
N >= 100
Print “Result is ”, result
result = N + 10
Print “Number is ”, N No
Yes

12. Problem
Write a program that calculates the total price of a ruler and a pencil. If the total price is more than $150, a discount of 5% is given. Compute and print the discount amount. Input the prices for the ruler and pencil and display the total price and the amount payable.

13. Requirements List the operations Write the Pseudocode
Draw the Flowchart.

14. IF-THEN-ELSE
When two options are available and a selection must be made, the IF-THEN-ELSE is used.
Pseudocode
IF (condition) then
One or more instructions which will be carried out if the condition is true
else
One or more instructions which will be carried out if the condition is false
ENDIF

15. Flowchart
yes no
Condition
Statement - True
Statement - False

16. Examples IF-THEN-ELSE
Problem 1:
If sales is greater than $7000, commission is $500 otherwise commission is $250
Solution:
Pseudocode
IF (sales > 7000) then
commission = 500
else
commission = 250
ENDIF
Flowchart
yes no
Sales > 7000
Commission = 500
Commission = 250

17. Examples IF-THEN-ELSE
Problem 2:
Read the age of a person. If age is greater than 35, output “old person” otherwise output “young person”
Solution:
Pseudocode
Read age
IF (age > 35) then
Print “Old person”
else
Print “Young person”
ENDIF
Flowchart
Students is required to do the flowchart

18. Problem 3:
Write a program that accepts employee’s salary. If the salary is less than or equal to $44000, then a bonus of 15% is given, otherwise 10% is given. Calculate and display the bonus amount given.
Requirements:
Write the Pseudocode
Draw the Flowchart

19. Pseudocode Start Declare salary, bonus as Real
Print “A program that accepts the salary for an employee, and calculate the bonus given”
Print “Enter salary”
Read salary
IF (salary <= 44000) then
bonus = salary * 0.15
else
bonus = salary * 0.10
ENDIF
Print “Bonus amount is ” bonus
Stop

20. Flowchart STOP START Print “Enter salary” Read salary Print
bonus = salary * 0.15
bonus = salary * 0.10
Yes No

21. Problem
A credit union pays 4% interest on shares that are greater than $25000 and 3% on all other shares. No interest is paid on deposits. Write a program that prompts the user to input a share a deposit. The program should calculate and output the interest amount and the total savings (Total savings = shares + deposit + interest amount).

22. Requirements
List the operations
Write the Pseudocode
Draw Flowchart

23. Home Work Cambridge – Information Technology for CSEC
Exercise 22 – Numbers 1 - 5

24. THE END