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

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,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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