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org.gui4j.core.util
Class MathCalc  

java.lang.Object
  org.gui4j.core.util.MathCalc

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public class MathCalc

extends java.lang.Object

This is the main source code for calculator written in Java 1.1 This program emulates a "real" calculator in that is has a simular user interface arranged in a standard order. It provides an advantage over most of the other calculators because you can viewer both the equation and the results at the same time and allows for editing of the entered equation. Also this calculator adheres to the rules of arithmetic where equation are evaluated in the order brackets, exponents, multiplication, division, addition and subtraction.

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Nested Class Summary
private static class	MathCalc.Functions           This class is a helper class to Calc which evaluates the functions that might appear in the equation.

 

Field Summary
(package private)  java.lang.String	display

 

Constructor Summary

MathCalc()

 

Method Summary
private static java.lang.String	brackets(java.lang.String swb)           This method clears all brackets from the expression beginning with the inner most bracket and working outwords and from left to right for non nested brackets.
private static java.lang.String	constants(java.lang.String swc)           this method replaces constant variable such as e and pe with there numeric values 2.71818...
static java.lang.String	evaluate(java.lang.String s)           This method is the controlling method for the evaluation of the mathematical equations
private static java.lang.String	exponent(java.lang.String se)           This method deals with exponents in the string
private static java.lang.String	func(java.lang.String sf)           This method evaluates all the functions in the expression filler line to see what happens another filler line a third filler line
private static java.lang.String	insertMultiply(java.lang.String ins)           insert the * in all positions of the equation of implicit multiplication
private static java.lang.String	mult(java.lang.String s)           This method deals with multiplication and division in a string and
private static java.lang.String	replace(java.lang.String sb, int l, int r, double d)           replaces the portion of the equation between r and l with the number represented by d
private static java.lang.String	resolve(java.lang.String str)           replace all combinations of signs eg.
private static java.lang.String	sum(java.lang.String s)           This method evaluates a string containing only addition and subtraction from left to right

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

display

java.lang.String display

Constructor Detail

MathCalc

public MathCalc()

Method Detail

brackets

private static java.lang.String brackets(java.lang.String swb)

This method clears all brackets from the expression beginning with the inner most bracket and working outwords and from left to right for non nested brackets.

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evaluate

public static java.lang.String evaluate(java.lang.String s)

This method is the controlling method for the evaluation of the mathematical equations

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constants

private static java.lang.String constants(java.lang.String swc)

this method replaces constant variable such as e and pe with there numeric values 2.71818... and 3.141259...

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sum

private static java.lang.String sum(java.lang.String s)

This method evaluates a string containing only addition and subtraction from left to right

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mult

private static java.lang.String mult(java.lang.String s)

This method deals with multiplication and division in a string and

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exponent

private static java.lang.String exponent(java.lang.String se)

This method deals with exponents in the string

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func

private static java.lang.String func(java.lang.String sf)

This method evaluates all the functions in the expression filler line to see what happens another filler line a third filler line

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replace

private static java.lang.String replace(java.lang.String sb,
                                        int l,
                                        int r,
                                        double d)

replaces the portion of the equation between r and l with the number represented by d

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insertMultiply

private static java.lang.String insertMultiply(java.lang.String ins)

insert the * in all positions of the equation of implicit multiplication

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resolve

private static java.lang.String resolve(java.lang.String str)

replace all combinations of signs eg. +- changed to -

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Home >> All >> org >> gui4j >> core >> [ util overview ]	PREV CLASS  NEXT CLASS
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