Question Hello, I need some assistance in writing a java pr...Hel.pdf

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Question: Hello, I need some assistance in writing a java pr... Hello, I need some assistance in writing a java program using stacks (LIFO). Create a Calculator w/ GUI Write a program that graphically displays a working calculator for simple infix expressions that consist of: single-digit operands, the operators: +, -, *, and /, and parentheses. Make the following assumptions: unary operators (e.g. -2) are illegal all operations, including division, are integer operations (and results are integers) the input expression contains no embedded spaces and no illegal characters the input expression is a syntactically correct infix expression division by zero will not occur (consider how you can remove this restriction) Create a GUI application, the calculator has a display and a keypad of 20 keys, which are arranged as follows: C < Q / 7 8 9 * 4 5 6 - 1 2 3 + 0 ( ) = As the user presses keys to enter an infix expression, the corresponding characters appear in the display. The C (Clear) key erases all input entered so far; the < (Backspace) key erases the last character entered. When the user presses the = key, the expression is evaluated and the result appended to the right end of the expression in the display window. The user can then press C and enter another expression. If the user presses the Q (Quit) key, the calculator ceases operation and is erased from the screen. C < Q / 7 8 9 * 4 5 6 - 1 2 3 + 0 ( ) = Solution import java.awt.*; import java.awt.event.*; public class MyCalculator extends Frame { public boolean setClear=true; double number, memValue; char op; String digitButtonText[] = {\"7\", \"8\", \"9\", \"4\", \"5\", \"6\", \"1\", \"2\", \"3\", \"0\", \"+/-\", \".\" }; String operatorButtonText[] = {\"/\", \"sqrt\", \"*\", \"%\", \"-\", \"1/X\", \"+\", \"=\" }; String memoryButtonText[] = {\"MC\", \"MR\", \"MS\", \"M+\" }; String specialButtonText[] = {\"Backspc\", \"C\", \"CE\" }; String buttonsText[]={\"C\",\"<\",\"Q\",\"/\"}; String buttonText1[]={\"7\",\"8\",\"9\",\"*\"}; String ButtonsText2[]={\"4\",\"5\",\"6\",\"-\"}; String ButtonText3[]={\"1\",\"2\",\"3\",\"+\"}; String ButtonText4[]={\"0\",\"(\",\")\",\"=\"}; MyDigitButton digitButton[]=new MyDigitButton[digitButtonText.length]; MyOperatorButton operatorButton[]=new MyOperatorButton[operatorButtonText.length]; MyMemoryButton memoryButton[]=new MyMemoryButton[memoryButtonText.length]; MySpecialButton specialButton[]=new MySpecialButton[specialButtonText.length]; Label displayLabel=new Label(\"0\",Label.RIGHT); Label memLabel=new Label(\" \",Label.RIGHT); final int FRAME_WIDTH=325,FRAME_HEIGHT=325; final int HEIGHT=30, WIDTH=30, H_SPACE=10,V_SPACE=10; final int TOPX=30, TOPY=50; /////////////////////////// MyCalculator(String frameText)//constructor { super(frameText); int tempX=TOPX, y=TOPY; displayLabel.setBounds(tempX,y,240,HEIGHT); displayLabel.setBackground(Color.BLUE); displayLabel.setForeground(Color.WHITE); add(displayLabel); memLabel.setBounds(TOPX, TOPY+HEIGHT+ V_SPACE,.

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character entered. When the user presses the = key, the expression is evaluated and the result
appended to the right end of the expression in the display window. The user can then press C and
enter another expression. If the user presses the Q (Quit) key, the calculator ceases operation and
is erased from the screen.
C
<
Q
/
7
8
9
*
4
5
6
-
1
2
3
+
0
(
)
=
Solution
import java.awt.*;
import java.awt.event.*;
public class MyCalculator extends Frame
{
public boolean setClear=true;
double number, memValue;
char op;

$String digitButtonText[] = {"7", "8", "9", "4", "5", "6", "1", "2", "3", "0", "+/-", "." }; String operatorButtonText[] = {"/", "sqrt", "*", "%", "-", "1/X", "+", "=" }; String memoryButtonText[] = {"MC", "MR", "MS", "M+" }; String specialButtonText[] = {"Backspc", "C", "CE" }; String buttonsText[]={"C","<","Q","/"}; String buttonText1[]={"7","8","9","*"}; String ButtonsText2[]={"4","5","6","-"}; String ButtonText3[]={"1","2","3","+"}; String ButtonText4[]={"0","(",")","="}; MyDigitButton digitButton[]=new MyDigitButton[digitButtonText.length]; MyOperatorButton operatorButton[]=new MyOperatorButton[operatorButtonText.length]; MyMemoryButton memoryButton[]=new MyMemoryButton[memoryButtonText.length]; MySpecialButton specialButton[]=new MySpecialButton[specialButtonText.length]; Label displayLabel=new Label("0",Label.RIGHT); Label memLabel=new Label(" ",Label.RIGHT); final int FRAME_WIDTH=325,FRAME_HEIGHT=325; final int HEIGHT=30, WIDTH=30, H_SPACE=10,V_SPACE=10; final int TOPX=30, TOPY=50; /////////////////////////// MyCalculator(String frameText)//constructor { super(frameText); int tempX=TOPX, y=TOPY; displayLabel.setBounds(tempX,y,240,HEIGHT); displayLabel.setBackground(Color.BLUE); displayLabel.setForeground(Color.WHITE); add(displayLabel); memLabel.setBounds(TOPX, TOPY+HEIGHT+ V_SPACE,WIDTH, HEIGHT); add(memLabel); // set Co-ordinates for Memory Buttons tempX=TOPX; y=TOPY+2*(HEIGHT+V_SPACE); for(int i=0; i0) resText=resText.substring(0,resText.length()-2); return resText;$

}
////////////////////////////////////////
public static void main(String []args)
{
new MyCalculator("Calculator -Ravi");
}
}
/*******************************************/
class MyDigitButton extends Button implements ActionListener
{
MyCalculator cl;
//////////////////////////////////////////
MyDigitButton(int x,int y, int width,int height,String cap, MyCalculator clc)
{
super(cap);
setBounds(x,y,width,height);
this.cl=clc;
this.cl.add(this);
addActionListener(this);
}
////////////////////////////////////////////////
static boolean isInString(String s, char ch)
{
for(int i=0; i

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