project report vipul nd raghav

7/31/2019 Project Report Vipul Nd Raghav

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PROJECT REPORT

ON

GUI Calculator

Submitted To: Submitted By:

Ms. Binwant Sethi Raghav DudejaVipul Bhagia


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DECLARATION

I hereby declare that the project report entitled GUICalculator which is being submitted in partial fulfillment ofthe requirement of PTUs 6 weeks post 4 th semester summer

training is the result of the project carried out by me under theguidance and supervision ofMs. Binwant Sethi.

I further declared that I or any other person has not previously

submitted this project report to any other institution/university

for any other degree/ diploma or any other person.

Date: 10-7-2012

Place: Amritsar (Vipul Bhagia)


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CONTENTS

SR. NO PARTICULARS

1. Prologue

2. Introduction

3. Choice of Front end and Back end

4. Hardware and Software Requirements

5. Snapshots

6. Working of Project

7. Source Code

8. Epilogue


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PROLOGUE

An electronic calculator is a small, portable, usually

inexpensive electronic device used to perform the basicoperations of arithmetic. Modern calculators are more portable

than most computers, though most PDAsare comparable in size

to handheld calculators.

Computer operating systems as far back as early Unix have

included interactive calculator programs such as dc and hoc,and calculator functions are included in almost all PDA-type

devices (save a few dedicated address book and dictionary

devices).

The GUI Calculator made by us using Java programming

language can perform the fundamental arithmetic operations of

addition, subtraction, multiplication and division. In addition to

this it has the square root and percentage functionality found in

most electronic computers.
http://en.wikipedia.org/wiki/Arithmetichttp://en.wikipedia.org/wiki/Arithmetichttp://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Personal_digital_assistantshttp://en.wikipedia.org/wiki/Personal_digital_assistantshttp://en.wikipedia.org/wiki/Ancient_UNIX_Systemshttp://en.wikipedia.org/wiki/Ancient_UNIX_Systemshttp://en.wikipedia.org/wiki/Dc_%28Unix%29http://en.wikipedia.org/wiki/Dc_%28Unix%29http://en.wikipedia.org/wiki/Hoc_%28programming_language%29http://en.wikipedia.org/wiki/Hoc_%28programming_language%29http://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Personal_digital_assistanthttp://en.wikipedia.org/wiki/Hoc_%28programming_language%29http://en.wikipedia.org/wiki/Dc_%28Unix%29http://en.wikipedia.org/wiki/Ancient_UNIX_Systemshttp://en.wikipedia.org/wiki/Personal_digital_assistantshttp://en.wikipedia.org/wiki/Computerhttp://en.wikipedia.org/wiki/Arithmetic


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INTRODUCTION

The project of GUI Calculator deals with the basic

calculations encountered in our daily life. Like all othercalculator applications the user enters a number then selects

an operand by clicking on it, then enters another number,

clicks on the = button and gets the required answer. The

numbers can be entered using the calculators buttons or the

computer keyboard.Characters other than digits and decimal point are not

allowed to be entered through the keyboard. To calculate

square root of a number a number has to be entered and then

the square root button is to be pressed. To use the percentage

button a number is to be entered(say 200) and a fundamental

operator is to be chosen, after that another number is to be

entered (say 25). On clicking the % button 25 is replaced

by 25% of 200 i.e. 50. After that on clicking the = button

we get the desired result according to the operator selected.

Continuous calculations can also be performed as the

fundamental operator buttons also serve the purpose of =

button


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CHOICE OF FRONT END AND BACK

END

In this project, JAVA is being used as Front end . there is no back end as

there is no requirement for it in our project.

JAVA:

Java is a computer language which is purely object-oriented. Java has two lives,

one as a stand alone computer language for general-purpose programming and the

other as a supporting language for Internet Programming. The general-purpose

programs are known applications and programs written for Internet are known as

applets.

Various features of Java are:

Compiled and Interpreted:

Java compiler translates sources code into what is known as byte code

instructions. Byte codes are not machine instructions and therefore, in the

second stage, Java interpreter generates machine code that can be directly

executed by the machine that is running the Java program. Thus, Java is both

compiled and an interpreted language.

Platform-Independent and Portable:The most significant contribution of Java is its portability. Java program

can be easily moved from one computer system to another. Changes nad


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upgrades in operating systems, processors and system resources will not force

any changes in Java programs.

Java ensures portability in two ways, First, Java compiler generates byte code

instructions that can implemented on any machine. Secondly, the size of the

primitive data types is machine-independent.

Object-Oriented:Java is a true object-oriented language. All program code and data reside

within objects and classes. The object model in Java is simple and easy to

extend.

Robust and Secure:Java is a robust language. It provides many safeguards to reliable code.

It has strict compile time and run time checking for data types.

Security becomes an important issue for a language that is used for

programming on Internet. Threat of viruses and abuse of resources is

everywhere. Java not only verifies all memory access but also ensure that no

viruses are communicated with an applet.

Distributed:Java is a distributed language for creating applications on networks. It

has the ability to share both data and programs. Java applications can open and

access remote objects on Internet as easily as they can do in a local system.

This enables multiple programmers at multiple remote locations to collaborate

and work together on a project.

Multithreaded and Interactive:


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Multithreaded means handling multiple tasks simultaneously. Java

supports multi-threaded programs. We do not have to wait for the application

to finish one task before beginning another. The Java runtime comes with tools

that support multiprocess synchronization and constructs smoothly running

interactive systems.

SWINGS

The most important feature of Java used in this project isSWINGS. Swing is

a set of user interface components that is implemented entirely in Java. Swing

is a set of classes that provides more powerful and flexible components than

are possible with the AWT.

Swings supplies components such as buttons, checkboxes, labels, tabbed panes,

scroll panes, trees and tables.

Swing components are not implemented by platform-specific code. Swings are

entirely written in Java and therefore, are platform-independent.

The various components of Swings are:


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Icons and Labels:Icons are encapsulated by the ImageIcon class, which paints an icon from

an image. The ImageIcon class implements the Icon interface that declares

various.

Text Fields:The Swing text field is encapsulated by the JTextComponent class, which

extends JComponents. It provides functionality that is common to Swing

text components. One of its subclassesJTextField, which allows you to

edit one line of text.

Buttons:Swings provide the class JButton which provides the functionality of a

push button. JButton allows an icon, a string, or both associated with the

push button. The JButton class, which provides the functionality of a

button, is a concrete implementation ofAbstractButton . When a button is

clicked, an action event is generated. This is handled by actionChanged().Inside actionChanged(), the getSource() method gets the JButton object

that generated the event.

Check Boxes:The JCheckBox class, which provides the functionality of a check box, is a

concrete implementation ofAbstractButton . When a checkbox is selectedor deselected, an item event is generated. This is handled by

itemStateChanged(). Inside itemStateChanged(), the getItem() method gets

the JCheckBox object that generated the event.


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Radio Buttons:Radio Buttons are supported by the JRadioButton class , which is a

concrete implementations of AbstractButton. Radio buttons must be

configured into a group. If a user presses a radio button that is in a group,

any previously selected button in that group is automatically deselected. The

ButtonGroup class is instantiated to create a button group.

Combo Boxes:Swings provide a combo box (a combination of text field and a drop down

list) through the JComboBox class, which extends JComponent. A Combo

Box normally displays one entry. However, it can also displays a drop-down

list that allows a user to select a different entry.


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H/W and S/W Requirements

Following are the hardware and software requirements to run the project

successfully:

HARDWARE REQUIREMENTS

1. PROCESSOR. PENTIUM I or above.

2. OPERATING SYSTEM. Win 95/95/NT 4.5/WIN XP

3. RANDOM ACCESS MEMORY. 32 MB or above.

4. HARD DISK. 4 GB or above.

5. MONITOR

7. KEY BOARD.

SOFTWARE REQUIREMENTS

1. JAVA


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SNAPSHOTS


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Invalid calculation

(0/0)


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WORKING OF THE PROJECT

For the layout of the calculator a single frame, 3 panels, 1 text

field and 20 buttons of the swing package have been used. The

1st panel contains the text field, he 2nd the buttons and the 3rd

contains the 1st 2 panels. The buttons have been arranged using a

grid layout for the 2nd panel. Out of the 20 buttons 10 are for the

digits, the remaining are (+), (-), (*), (/),(.),(=),(%), backspace,

clear and square root. The code for layout is written within the

constructor.

The number entered by the user is taken into the text field. It

may be entered either through the keyboard or using the buttons.When the user chooses an operator the text in the text field is

taken and converted to a double value through the

Double.valueOf(str) method and stored in a double variable (p).

Then the user enters another number and the same is done withit when we press the = button and we get another doublevariable (q). According to the operator the calculation is

performed and we get the desired result in the textfield. In placeof the = button we can also use any of the 4 fundamentaloperator buttons, thus continuous calculation is performed. The

other operator buttons also work in a similar fashion.

2 interfaces have been used in this, ActionListener and

KeyListener. KeyListener is used to prevent the user from

pressing alphabet or other non numerical character keys except

the decimal point. This has been done using the consume()

method.


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SOURCE CODE

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.lang.*;

class project1 implements ActionListener,KeyListener

{

JFrame f;

int flag,i,z=5,k=0,len2;

char c2=247;

double p=0,q,r,s;

JPanel p1,p2,p3;

JTextField tf1;

JButton b[]=new JButton[20];

JTextField tf;

GridLayout g;

String abc[]={"1","2","3","+","4","5","6","-

","7","8","9","X","C","0","=",String.valueOf(c2),".","%", "\u2190","\u221A"};

String s1=" ",s3,s4;

project1(){

p2=new JPanel();

p1=new JPanel();

f=new JFrame("Calculator");

tf=new JTextField(40);

tf.addKeyListener(this);

for(i=0;i


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g=new GridLayout(5,4);

p1.setLayout(g);

p2.setLayout(null);

p1.setBounds(10,60,275,200);

tf.setBounds(30,10,235,40);

for(i=0;i


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}

public void actionPerformed(ActionEvent e)

{

for(i=0;i


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k=0;

z=0;

r=0;

p=0;

q=0;

s4="";

tf.setText("");flag=0;

}

if(e.getSource()==b[3])

{

calc();

p=Double.valueOf(tf.getText());

flag=1;

z=1;

k++;

}


{

calc();p=Double.valueOf(tf.getText());

flag=2;

z=2;

k++;

}


{

calc();


flag=3;

z=3;

k++;

}


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{

calc();


flag=4;

z=4;k++;

}


{

s=Double.valueOf(tf.getText());

q=p*s/100;

s4=String.valueOf(q);

len2=s4.length();

if((s4.substring(len2-2,len2)).equals(".0"))

s4=s4.substring(0,len2-2);

tf.setText(s4);

}

if(e.getSource()==b[18]){

s1=tf.getText();

s1=s1.substring(0,s1.length()-1);

tf.setText(s1);

}


{


p=Math.sqrt(p);

s4=String.valueOf(p);

len2=s4.length();




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tf.setText(s4);

z=5;

}


{

calc();

k=0;

}

}

public void calc()

{

q=Double.valueOf(tf.getText());

if(flag==4&&q==0)

{

if(p==0)

JOptionPane.showMessageDialog (null, "This value is indeterminate" );

else

JOptionPane.showMessageDialog (null, "Infinity" );

tf.setText("");

k=0;flag=0;

}

else

{

switch(flag)

{

case 1:

r=p+q;

break;

case 2:

r=p-q;

break;

case 3:

r=p*q;

break;


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case 4:

r=p/q;

}

if(k==0)

s4=String.valueOf(q);

elses4=String.valueOf(r);

len2=s4.length();



tf.setText(s4);

}

}

public static void main(String []a)

{

project1 obj= new project1();

}

}


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EPILOGUE

As no system design is ever perfect as communication problems,

programmers lack of knowledge or time constraints create errors. A perfect

project is that in which there are minimum number of errors, one which has

the simplest and most concise source code, which is user friendly and

handles exceptions properly. The number and nature of errors in the design

depends on several factors.

Some of the responsible factors are: -

1) Communication between the user and the designer2) The programmers ability to generate a code that reflects exactly the

system Specifications

3) The time frame for the design

In this Project, we have tried our best to cover each aspect carefully and accurately.

On further analysis the drawbacks of this system may show themselves, which may

further require modifications.


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project report vipul nd raghav

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