Conditionals In Alice
can either be true or false
A Boolean variable
If statement
A type of conditional or selection statement that allows for another option if the Boolean expression is true.
T
A conditional expression is a question that will evaluate to either true or false T/F
Return types
A data type that indicates what type of information that method will give back when it is called.
stored
A function returns a value, and we will need a place for this variable to be _____
String
A popular data type that is used to store groups of characters. Usually this means words or sentences
If else statement
A type of conditional or selection statement that allows for a choice of options, one if the Boolean expression is true and a different one if it is false.
functions
Alice allows us to obtain input from the user through the use of _____
T
Alice provides us with built-in functions. T/F
function
In a _____, objects do not move or perform any actions, so the state of the world is left unchanged.
conditional statement
In order for the computer to make a decision we are going to have to use a _______
Variables
_____ allow you to store data by assigning the value to a name
integer
a data type that stores integer numbers.
Functions
a method that returns a value
Object
a thing such as a person or vehicle created based off of a 3D model or class
conditional statement
allows us to choose which statement will be executed next based on the evaluation of a boolean condition.
event
an action like a button push or a mouse click
Real Number
any number that can be written as a fraction
Function
asks a question of the object and returns a value when called
Integer
data type that stores numbers that is positive or negative whole number and zero
Double
data type that stores real numbers.
double
data type that stores real numbers. A real number is any number that can be written as a fraction
data type
indicates what values can be stored with a variable
compound conditional
joining more than one conditional, usually with a relationship operator like NOT, AND, and OR
vehicle
means that the two objects are linked so that if the vehicle moves this object will also move
variable
named memory location which is used to store values for the program
Procedures
no return value
class
outline of the object that defines the procedures and properties for all objects of that class
procedures functions
In Alice we have both___ and ___
return type
In Alice, all functions have a _____ because they must return some information.
property
piece of info about a particular object (thing)
parameters
piece of info that is passed to the procedure
String
popular type that is used to store groups of characters. usually this means words or sentences
Boolean
The value returned from a function can be a number, an object or a _____
d) Boolean
The value that the proximity question "mummy is within a given distance of an object" will return is a: a) Number b) Position c) Object d) Boolean e) None of the above
Function available to get input from the user
This is an example of what? this getBooleanFrom User message ????
Method (local): defined for use within a method Parameter: variable passed to a method Object (property): used to store an object property
Three types of variables
Conditional
something that can be true or false. Also known as a Boolean expression
initialize
to give it a starting value to a variable
while loop
type of indefinite loop used to repeat a section of code while a condition is true
positive whole number negative whole number zero
What are the numbers an integer can be
Use an if statement or if-else statement.
What do we use to create a decision in our programs?
Conditional
Something that can be true or false. Also known as a Boolean expression.
Boolean
Something that can be true or false. Also known as a conditional.
Boolean
Something that can be true or false. Known as a conditional
Function
Asks a question of the object and returns a value when called.
abstraction
By creating our own functions we have demonstrated the use of ______
Procedure
Commands that tell an object to complete a task.
Integer - positive, negative whole numbers and 0. Double - real numbers, anything that can be written as a decimal. Boolean - true or false. String - characters that are put together to form words or sentences.
Describe the different variable types
procedure's name.
Rather than having to write out all the details involved in our new procedures, we can just call the ______________
vehicle
Use the ___ property to synchronize the movements of two objects
visual or textual storyboard
We would want to use a _______ to plan out our method.
1. Start with a letter 2. Contain only letters, numbers or underscores 3. Can not be a keyword
What are Rules for identifiers
function procedure
What are the 2 types of methods in Alice
1. We have to choose a data type, from the following choices: integer double boolean string 2. name our variables by using a proper identifier 3. initialize the variable- give it a starting value
What are the 3 steps to create a variable
c) If the horse moves, so does the cat.
What does it mean to say that the "cat's vehicle is the horse"? a) If the cat moves, so does the horse b) Clicking on the cat makes the horse move c) If the horse moves, so does the cat. d) Clicking on the horse makes the cat move e) None of the above
A boolean statement that can be judged as either true or false
What is a conditional statement
Type of method. Something an object knows how to do like move or turn
What is a procedure
a conditional statement. A boolean statement that can be judged as either true or false
What is an if statement
A function is like a question. It will return a value. A procedure is a command. There is no return value.
What is the difference between functions and procedures?
A completed statement that we can use to get the number of times we want the skater to spin.
What is this an example of Double numSpinTimes= this getDoubleFromUser "Enter the number of times the skater should spin"
