Designing Software

Designing Software What have we learned?

Designing Software What have we learned? Computers are totally literal

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Simple is always best

Designing Software What have we learned? Computers are totally literal

Designing Software What have we learned? Computers are totally literal They do EXACTLY what you tell them to do

Designing Software What have we learned? Computers are totally literal They do EXACTLY what you tell them to do They do ONLY what you tell them to do

Designing Software What have we learned? Computers are totally literal They do EXACTLY what you tell them to do They do ONLY what you tell them to do They make absolutely NO assumptions

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Look for steps that are repeated

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Look for steps that are repeated Look for complicated sub-tasks that could be considered on their own

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Look for steps that are repeated Look for complicated sub-tasks that could be considered on their own Name the function something meaningful

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Loop WHILE something is true

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Loop WHILE something is true Loop UNTIL a condition is met

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Loop WHILE something is true Loop UNTIL a condition is met Great opportunity to use functions

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer More efficient than if … else if …

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer More efficient than if … else if … As soon as it gets a match, can skip the rest…

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer More efficient than if … else if … As soon as it gets a match, can skip the rest… Avoids errors of if … if …

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer More efficient than if … else if … As soon as it gets a match, can skip the rest… Avoids errors of if … if … What if get a match on more than one if ?

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer More efficient than if … else if … As soon as it gets a match, can skip the rest… Avoids errors of if … if … What if get a match on more than one if ? What if handing the match changes what you are using to do following matches?

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Basically a bucket that holds a piece of information

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Basically a bucket that holds a piece of information You can find out what is in the bucket … read the variable

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Basically a bucket that holds a piece of information You can find out what is in the bucket … read the variable You can put new info in the bucket … write the variable

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Start with general, then go to specific

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Start with general, then go to specific Don’t dive into the details until you know the basics of how you’ll do it

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Simple is always best

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Simple is always best Analyze how you would do it … your brain is very efficient

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Simple is always best Analyze how you would do it … your brain is very efficient Find a similar but simpler problem to analyze

Designing Software What have we learned? Computers are totally literal Functions are great for repackaging complex stuff into one thing Looping helps us handle repeated tasks Decisions – using if … else if … help the computer Variables help us remember information Top-down design – figure out major steps/flow before details Simple is always best

Clear and Unclear Windows