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kishanrajput23kishanrajput23
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Merge pull request #419 from Prakhar-Shankar/calculatorJava
Create javaCalculator.java
2 parents e734727 + f68f210 commit 98534c6

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‎javaCalculator.java

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import java.awt.*;
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import java.awt.event.*;
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/*********************************************/
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public class MyCalculator extends Frame
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{
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public boolean setClear=true;
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double number, memValue;
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char op;
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String digitButtonText[] = {"7", "8", "9", "4", "5", "6", "1", "2", "3", "0", "+/-", "." };
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String operatorButtonText[] = {"/", "sqrt", "*", "%", "-", "1/X", "+", "=" };
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String memoryButtonText[] = {"MC", "MR", "MS", "M+" };
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String specialButtonText[] = {"Backspc", "C", "CE" };
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MyDigitButton digitButton[]=new MyDigitButton[digitButtonText.length];
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MyOperatorButton operatorButton[]=new MyOperatorButton[operatorButtonText.length];
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MyMemoryButton memoryButton[]=new MyMemoryButton[memoryButtonText.length];
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MySpecialButton specialButton[]=new MySpecialButton[specialButtonText.length];
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Label displayLabel=new Label("0",Label.RIGHT);
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Label memLabel=new Label(" ",Label.RIGHT);
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final int FRAME_WIDTH=325,FRAME_HEIGHT=325;
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final int HEIGHT=30, WIDTH=30, H_SPACE=10,V_SPACE=10;
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final int TOPX=30, TOPY=50;
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///////////////////////////
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MyCalculator(String frameText)//constructor
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{
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super(frameText);
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int tempX=TOPX, y=TOPY;
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displayLabel.setBounds(tempX,y,240,HEIGHT);
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displayLabel.setBackground(Color.BLUE);
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displayLabel.setForeground(Color.WHITE);
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add(displayLabel);
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memLabel.setBounds(TOPX, TOPY+HEIGHT+ V_SPACE,WIDTH, HEIGHT);
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add(memLabel);
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// set Co-ordinates for Memory Buttons
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tempX=TOPX;
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y=TOPY+2*(HEIGHT+V_SPACE);
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for(int i=0; i<memoryButton.length; i++)
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{
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memoryButton[i]=new MyMemoryButton(tempX,y,WIDTH,HEIGHT,memoryButtonText[i], this);
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memoryButton[i].setForeground(Color.RED);
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y+=HEIGHT+V_SPACE;
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}
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//set Co-ordinates for Special Buttons
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tempX=TOPX+1*(WIDTH+H_SPACE); y=TOPY+1*(HEIGHT+V_SPACE);
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for(int i=0;i<specialButton.length;i++)
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{
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specialButton[i]=new MySpecialButton(tempX,y,WIDTH*2,HEIGHT,specialButtonText[i], this);
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specialButton[i].setForeground(Color.RED);
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tempX=tempX+2*WIDTH+H_SPACE;
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}
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//set Co-ordinates for Digit Buttons
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int digitX=TOPX+WIDTH+H_SPACE;
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int digitY=TOPY+2*(HEIGHT+V_SPACE);
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tempX=digitX; y=digitY;
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for(int i=0;i<digitButton.length;i++)
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{
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digitButton[i]=new MyDigitButton(tempX,y,WIDTH,HEIGHT,digitButtonText[i], this);
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digitButton[i].setForeground(Color.BLUE);
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tempX+=WIDTH+H_SPACE;
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if((i+1)%3==0){tempX=digitX; y+=HEIGHT+V_SPACE;}
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}
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//set Co-ordinates for Operator Buttons
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int opsX=digitX+2*(WIDTH+H_SPACE)+H_SPACE;
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int opsY=digitY;
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tempX=opsX; y=opsY;
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for(int i=0;i<operatorButton.length;i++)
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{
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tempX+=WIDTH+H_SPACE;
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operatorButton[i]=new MyOperatorButton(tempX,y,WIDTH,HEIGHT,operatorButtonText[i], this);
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operatorButton[i].setForeground(Color.RED);
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if((i+1)%2==0){tempX=opsX; y+=HEIGHT+V_SPACE;}
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}
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addWindowListener(new WindowAdapter()
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{
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public void windowClosing(WindowEvent ev)
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{System.exit(0);}
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});
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setLayout(null);
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setSize(FRAME_WIDTH,FRAME_HEIGHT);
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setVisible(true);
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}
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//////////////////////////////////
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static String getFormattedText(double temp)
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{
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String resText=""+temp;
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if(resText.lastIndexOf(".0")>0)
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resText=resText.substring(0,resText.length()-2);
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return resText;
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}
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////////////////////////////////////////
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public static void main(String []args)
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{
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new MyCalculator("Calculator - JavaTpoint");
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}
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}
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/*******************************************/
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class MyDigitButton extends Button implements ActionListener
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{
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MyCalculator cl;
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//////////////////////////////////////////
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MyDigitButton(int x,int y, int width,int height,String cap, MyCalculator clc)
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{
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super(cap);
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setBounds(x,y,width,height);
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this.cl=clc;
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this.cl.add(this);
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addActionListener(this);
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}
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////////////////////////////////////////////////
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static boolean isInString(String s, char ch)
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{
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for(int i=0; i<s.length();i++) if(s.charAt(i)==ch) return true;
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return false;
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}
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/////////////////////////////////////////////////
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public void actionPerformed(ActionEvent ev)
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{
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String tempText=((MyDigitButton)ev.getSource()).getLabel();
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if(tempText.equals("."))
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{
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if(cl.setClear)
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{cl.displayLabel.setText("0.");cl.setClear=false;}
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else if(!isInString(cl.displayLabel.getText(),'.'))
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cl.displayLabel.setText(cl.displayLabel.getText()+".");
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return;
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}
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int index=0;
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try{
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index=Integer.parseInt(tempText);
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}catch(NumberFormatException e){return;}
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if (index==0 && cl.displayLabel.getText().equals("0")) return;
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if(cl.setClear)
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{cl.displayLabel.setText(""+index);cl.setClear=false;}
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else
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cl.displayLabel.setText(cl.displayLabel.getText()+index);
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}//actionPerformed
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}//class defination
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/********************************************/
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class MyOperatorButton extends Button implements ActionListener
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{
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MyCalculator cl;
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MyOperatorButton(int x,int y, int width,int height,String cap, MyCalculator clc)
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{
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super(cap);
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setBounds(x,y,width,height);
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this.cl=clc;
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this.cl.add(this);
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addActionListener(this);
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}
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///////////////////////
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public void actionPerformed(ActionEvent ev)
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{
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String opText=((MyOperatorButton)ev.getSource()).getLabel();
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cl.setClear=true;
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double temp=Double.parseDouble(cl.displayLabel.getText());
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if(opText.equals("1/x"))
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{
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try
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{double tempd=1/(double)temp;
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cl.displayLabel.setText(MyCalculator.getFormattedText(tempd));}
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catch(ArithmeticException excp)
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{cl.displayLabel.setText("Divide by 0.");}
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return;
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}
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if(opText.equals("sqrt"))
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{
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try
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{double tempd=Math.sqrt(temp);
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cl.displayLabel.setText(MyCalculator.getFormattedText(tempd));}
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catch(ArithmeticException excp)
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{cl.displayLabel.setText("Divide by 0.");}
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return;
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}
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if(!opText.equals("="))
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{
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cl.number=temp;
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cl.op=opText.charAt(0);
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return;
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}
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// process = button pressed
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switch(cl.op)
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{
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case '+':
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temp+=cl.number;break;
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case '-':
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temp=cl.number-temp;break;
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case '*':
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temp*=cl.number;break;
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case '%':
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try{temp=cl.number%temp;}
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catch(ArithmeticException excp)
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{cl.displayLabel.setText("Divide by 0."); return;}
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break;
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case '/':
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try{temp=cl.number/temp;}
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catch(ArithmeticException excp)
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{cl.displayLabel.setText("Divide by 0."); return;}
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break;
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}//switch
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cl.displayLabel.setText(MyCalculator.getFormattedText(temp));
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//cl.number=temp;
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}//actionPerformed
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}//class
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/****************************************/
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class MyMemoryButton extends Button implements ActionListener
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{
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MyCalculator cl;
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/////////////////////////////////
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MyMemoryButton(int x,int y, int width,int height,String cap, MyCalculator clc)
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{
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super(cap);
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setBounds(x,y,width,height);
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this.cl=clc;
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this.cl.add(this);
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addActionListener(this);
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}
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////////////////////////////////////////////////
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public void actionPerformed(ActionEvent ev)
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{
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char memop=((MyMemoryButton)ev.getSource()).getLabel().charAt(1);
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cl.setClear=true;
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double temp=Double.parseDouble(cl.displayLabel.getText());
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switch(memop)
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{
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case 'C':
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cl.memLabel.setText(" ");cl.memValue=0.0;break;
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case 'R':
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cl.displayLabel.setText(MyCalculator.getFormattedText(cl.memValue));break;
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case 'S':
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cl.memValue=0.0;
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case '+':
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cl.memValue+=Double.parseDouble(cl.displayLabel.getText());
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if(cl.displayLabel.getText().equals("0") || cl.displayLabel.getText().equals("0.0") )
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cl.memLabel.setText(" ");
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else
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cl.memLabel.setText("M");
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break;
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}//switch
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}//actionPerformed
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}//class
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/*****************************************/
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class MySpecialButton extends Button implements ActionListener
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{
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MyCalculator cl;
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MySpecialButton(int x,int y, int width,int height,String cap, MyCalculator clc)
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{
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super(cap);
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setBounds(x,y,width,height);
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this.cl=clc;
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this.cl.add(this);
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addActionListener(this);
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}
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//////////////////////
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static String backSpace(String s)
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{
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String Res="";
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for(int i=0; i<s.length()-1; i++) Res+=s.charAt(i);
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return Res;
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}
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//////////////////////////////////////////////////////////
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public void actionPerformed(ActionEvent ev)
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{
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String opText=((MySpecialButton)ev.getSource()).getLabel();
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//check for backspace button
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if(opText.equals("Backspc"))
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{
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String tempText=backSpace(cl.displayLabel.getText());
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if(tempText.equals(""))
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cl.displayLabel.setText("0");
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else
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cl.displayLabel.setText(tempText);
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return;
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}
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//check for "C" button i.e. Reset
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if(opText.equals("C"))
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{
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cl.number=0.0; cl.op=' '; cl.memValue=0.0;
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cl.memLabel.setText(" ");
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}
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//it must be CE button pressed
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cl.displayLabel.setText("0");cl.setClear=true;
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}//actionPerformed
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}//class

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