Speech Conditionals - ngā here


Discuss Kōrero Mai: What are comparative operators/conditionals?

what do you think comparative operators/conditionals are?



Here are some examples of operators that can help a programmer compare:



how could you use conditionals/comparatives when programming?

why do you think programmers use comparative operators?




Logic Gates

Discuss Kōrero Mai: How would you check for multiple conditions at once?

Complete the following sentence below:

"When you go to the shops, can you buy some cereal ____ some bread?"

What word did you use?

How did it affect the sentence's meaning?



Checking multiple statements at once

Some solutions to the previous question could have been :

  • … buy some cereal AND some bread
  • … buy some cereal OR some bread
  • … buy some cereal NOT some bread

You can see that by adding in a single word changes the statements outcome.

Discuss Kōrero Mai: How could we use this in programming?


Basic logic gates

Programs need to know what to output depending on the input given. In order for programs to check multiple inputs at once, we can use the basics of logic gates.

Think of a logic gate as a switch and your code as a circuit. The switch determines if that section of the circuit should be powered on or off. These switches can have different conditions.



AND Gate


The first and one of the simplest logic gates is the AND gate. This checks if 2 or more inputs are all TRUE. If even one input is false, the gate does not allow the code to flow.


IF input A AND input B are true. Then output Y is True



OR Gate


The second is an OR gate. This allows the flow of code if ANY of the inputs are TRUE.


IF input A OR Input B is true. Then Output Y is true



NOT Gate


This one behaves slightly differently. It instead outputs the opposite of the signal that it receives.


IF Input A is true, Output Y is false IF Input A is false, Output Y is true



Discuss Kōrero Mai: How would you use these logic gates in your code

Logic gates in our code are generally used when we should or shouldn't have something occur. Sound familiar?

IF Statements are the best example of this. But how do we write these logic gates in our code?

  • We can use '&&' in place of AND
  • We can use '||' in place of OR
  • We can use '!' in place of NOT
    •




    Solving Truth Tables

    Ready? Kua reri? - Ready? It's your turn... Solve all the different possible outcomes

    Analyse the logic circuit below and determine all of the different outcomes. Output your results in a truth table. The first couple have been done for you.



    Kua mutu? Finished?

    Try constructing your own logic circuits by visiting logic.ly here!