Basic Conditions

Challenge: ● Ask the user his/her name ● If it’s “Wally,” jeer him ● Pause video and try on your own.

Conditional Branching ● Allows the computer to “make decisions” ● Based on a condition ● Embedded into some other programming structure

Condition ● Expression ● Can be evaluated to true or false ● Often compares a variable to a value ● Sometimes compares two variables

Comparison Operators ● == Equals ● != Not Equal ● <= Less than or equal to ● >= Greater than or equal to ● < Less than ● > Greater than

If Statement ● Checks a condition ● Begins a block of code ● If condition is true, executes all code in block ● If condition is false, skips code block

If example ● If it’s raining: – Wear a raincoat ● End if

Challenge Algorithm New program hiWally by me New variable userName string starts with “” Ask user’s name, store in userName If userName is equal to “Wally” Output “You Bovine” End if End Program

Challenge ● Modify the Wally program so it says one thing if the user’s name is Wally, and a more benign greeting if it’s someone else ● Pause video and try on your own…

Using an Else Clause ● Else is a useful addition to If statements. ● Else allows you to set up another block of code to execute if the condition is false

If-Else Example ● If it’s raining: – Wear a raincoat ● Else – Wear a sweater ● End if

Challenge Algorithm New program wallyOrNot by me New variable userName string starts with “” Ask user’s name, store in userName If userName is equal to “Wally” Output “You Bovine” Else Output “Do I know you” + userName + “?” End if End Program

Challenge Algorithm

Code ● My code