This document discusses conditional statements in programming. Conditional statements use IF/THEN logic to test whether conditions are true or false and execute different code blocks based on the results. They can test for a single condition with IF/THEN/ELSE, multiple conditions by chaining ELSE IF statements, and use comparison operators like ==, <, >, <=, >=, and != to evaluate relationships between values. Pseudocode and Python examples are provided.

1. Conditional Statements

2. Conditional Statements
Computer programs need to make decisions.
We use a conditional statement in programming to test
whether or not something is true.
A conditional statement takes the form IF…THEN…
IF something is true THEN do something

3. Pseudocode

4. Python

5. Pseudocode

6. Python

7. Else
The ELSE statement can be used with the IF statement to
provide an alternative outcome from the condition.
The conditional statement can be extended to take the
form IF…THEN…ELSE
IF something is true THEN
do something
ELSE
do something different

8. Pseudocode

9. Python

10. Multiple Conditions
It is possible to further extend the conditional statement to
test for more than one condition.
IF something is true THEN
do something
ELSE IF something else is true
do something different
ELSE IF something else again is true
do something different
etc

11. Pseudocode

12. Python

13. Comparison Operators
So far we have tested to see if two things are equal, but
there are other comparison operators we can use.
Operator Description
= (note: == in Python) Equal to
< Less than
> Greater than
<= Less than or equal to
>= Greater than or equal to
<> (note: != in Python) Not equal to

14. Pseudocode