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CalculatorModel.java

(generated using Javadoc to Markdown)

public class CalculatorModel​

This is the model of this MVC implementation of a calculator. It performs the functions of the calculator and keeps track of what the user has entered.

  • Author: Tom Bylander

private double displayValue​

This is the numeric value of the number the user is entering, or the number that was just calculated.

private double internalValue​

This is the previous value entered or calculated.

private String displayString​

This is the String corresponding to what the user. is entering

private String operation​

This is the last operation entered by the user.

private boolean start​

This is true if the next digit entered starts a new value.

private boolean dot​

This is true if a decimal dot has been entered for the current value.

public CalculatorModel()​

Initializes the instance variables.

public String getValue()​

  • Returns: the String value of what was just calculated

    or what the user is entering

public void update(String text)​

Updates the values maintained by the calculator based on the button that the user has just clicked.

  • Parameters: text — is the name of the button that the user has just clicked

public double operationAdd(double rhs, double lhs)​

Operation to add two numbers. 

 operationAdd(3,2); // should equal 5.0

  • Parameters:
    • rhs — double representing the right hand side of the operator
    • lhs — double representing the left hand side of the operator
  • Returns: double