Jeroo Methods and Loops Review

Every Jeroo program must have exactly one

main method

main method

describes how to use one or more Jeroos to solve a specific problem

Everything that appears between the braces should be indented

2 or 3 spaces.

The first part of the main method must be used to

declare and instantiate all the Jeroos that will be used by the program

declaration portion

indicates that the programmer plans to use a Jeroo to help solve the problem

instantiation portion

a request that the Jeroo object be created

The programmer must provide an _______ for the Jeroo object

identifier

The crucial part of the instantiation is the

constructor

action statement

a request that a Jeroo perform a specific task

behavior

an action that an object can take or a task that it can perform in response to a request from an external source

method

collection of statements that are written in some programming language to describe a specific behavior

A Jeroo method contains

the source code that describes what an arbitrary Jeroo needs to do to carry out the corresponding behavior

precondition

something that is assumed to be true before the method is invoked

postcondition

something that is true after the method has been executed

control structure

a feature of a programming language that determines the order in which statements will be executed

Boolean expression

any expression that can be either true or false

repetition structure

allows a group of statements to be executed several times in succession

selection structure

defines alternate paths through the source code

There are two major parts to every repetition structure,

the body and the controlling condition

body of the loop.

The block of statements that can be executed repeatedly

trip (or iteration)

Each time that the statements in the body are executed

controlling condition

a condition that is checked to determine whether to make a trip through the body or terminate the loop

pretest loop

the controlling condition is always checked before the body can be executed for the first time

posttest loop

the controlling condition is not checked until after the first trip through the body

while loop

a true condition leads to a trip through the body, but a false condition terminates the loop

until loop

a true condition terminates the loop, but a false condition leads to a trip through the body

Boolean expression

any expression that is either true or false