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here is the code to the GUI part that i made, along with the calculator that works but doesn't use Stacks
import java.awt.*;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.util.*;
public class Calculate extends JFrame implements ActionListener {
// 10 11 12 13 14 15 16 17 18
String numbers[]={"0","1","2","3","4","5","6","7","8","9","+","-","*","/",".","CE","C","=","+/-"};
JButton button[]=new JButton[19];
Panel p[]=new Panel[6];
TextField text;
Box box;
FlowLayout fv;
Calculate(String title)
{
super(title);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
box=Box.createVerticalBox();
fv=new FlowLayout();
fv.setVgap(20);
this.setLocationRelativeTo(null);
for(int i=0;i<numbers.length;i++)
{
button[i]=new JButton(numbers[i]);
button[i].addActionListener(this);
if(i!=15&&i!=16)
{
button[i].setPreferredSize(new Dimension(55,35));
}
else
{
button[i].setPreferredSize(new Dimension(85,35));
}
if(i<6)
{
p[i]=new Panel();
box.add(p[i]);
}
if(i==0)
{
text=new TextField("0",30);
p[0].add(text);
}
}
p[1].add(button[7]);p[1].add(button[8]);p[1].add(button[9]);p[1].add(button[10]);
p[2].add(button[4]);p[2].add(button[5]);p[2].add(button[6]);p[2].add(button[11]);
p[3].add(button[1]);p[3].add(button[2]);p[3].add(button[3]);p[3].add(button[12]);
p[4].add(button[0]);p[4].add(button[14]);p[4].add(button[18]);p[4].add(button[13]);
p[5].add(button[15]);p[5].add(button[16]);p[5].add(button[17]);
this.add(box);
this.setBounds(520,200,280,320);
this.setResizable(false);
this.setVisible(true);
this.validate();
}
int press=0;
int press1=0;
int press2=0;
int strlen=0;
StringBuffer str=new StringBuffer("0");
StringBuffer str2=new StringBuffer("0");
double sum1=0;
public void actionPerformed(ActionEvent e) {
if(e.getSource()==button[10])
{
this.yunsf(10);
}
if(e.getSource()==button[11])
{
this.yunsf(11);
}
if(e.getSource()==button[12])
{
this.yunsf(12);
}
if(e.getSource()==button[13])
{
this.yunsf(13);
}
if(e.getSource()==button[14])
{
if(str.charAt(str.length()-1)!='+'&&str.charAt(str.length()-1)!='-'&&str.charAt(str.length()-1)!='*'&&str.charAt(str.length()-1)!='/'&&press!=1)
{
str.append(button[14].getText());
str2.append(button[14].getText());
text.setText(str.toString());
press=1;
}
}
if(e.getSource()==button[18])
{
if(str.charAt(str.length()-1)!='+'&&str.charAt(str.length()-1)!='-'&&str.charAt(str.length()-1)!='*'&&str.charAt(str.length()-1)!='/')
{
if(press2==0)
{
str.insert(strlen, "-");
str2.insert(strlen, "@");
text.setText(str.toString());
press2=1;
}
else
{
str.deleteCharAt(strlen);
str2.deleteCharAt(strlen);
text.setText(str.toString());
press2=0;
}
}
}
if(e.getSource()==button[15])
{
if(strlen!=0)
{
str.delete(strlen, str.length());
str2.delete(strlen, str2.length());
text.setText(str.toString());
}
else
{
str.delete(0,str.length());
str2.delete(0,str2.length());
str.append("0");
str2.append("0");
text.setText(str.toString());
press=0;
press2=0;
}
}
if(e.getSource()==button[16])
{
str.delete(0, str.length());
str2.delete(0, str2.length());
str.append("0");
str2.append("0");
text.setText(str.toString());
press=0;
press1=0;
press2=0;
strlen=0;
}
if(e.getSource()==button[17])
{
if(str.charAt(str.length()-1)!='+'&&str.charAt(str.length()-1)!='-'&&str.charAt(str.length()-1)!='*'&&str.charAt(str.length()-1)!='/'&&press!=1)
{
String txt=str2.toString();
String shu[]=txt.split("\\+|\\-|\\*|\\/");
String fh[]=txt.split("@\\d+\\\56\\d+|@\\d+|\\d+\\\56\\d+|\\d+");
for(int i=0;i<shu.length;i++)
{
if(shu[i].startsWith("@"))
{
shu[i]="-"+shu[i].substring(1);
}
}
calculate(shu,fh);
}
}
if(e.getSource()==button[0])
{
this.shuzi(0);
}
if(e.getSource()==button[1])
{
this.shuzi(1);
}
if(e.getSource()==button[2])
{
this.shuzi(2);
}
if(e.getSource()==button[3])
{
this.shuzi(3);
}
if(e.getSource()==button[4])
{
this.shuzi(4);
}
if(e.getSource()==button[5])
{
this.shuzi(5);
}
if(e.getSource()==button[6])
{
this.shuzi(6);
}
if(e.getSource()==button[7])
{
this.shuzi(7);
}
if(e.getSource()==button[8])
{
this.shuzi(8);
}
if(e.getSource()==button[9])
{
this.shuzi(9);
}
}
public void yunsf(int i)
{
if(str.charAt(str.length()-1)!='+'&&str.charAt(str.length()-1)!='-'&&str.charAt(str.length()-1)!='*'&&str.charAt(str.length()-1)!='/'&&str.charAt(str.length()-1)!='.')
{
str.append(button[i].getText());
str2.append(button[i].getText());
text.setText(str.toString());
press=0;
press1=1;
press2=0;
strlen=str.length();
}
}
public void shuzi(int i)
{
if(press1!=1&&press!=1&&str.charAt(0)=='0')
{
str.replace(0, 1,button[i].getText());
str2.replace(0, 1,button[i].getText());
text.setText(str.toString());
}
else
{
str.append(button[i].getText());
str2.append(button[i].getText());
text.setText(str.toString());
}
}
public void calculate(String shu[],String fh[])
{
for(int i=1;i<fh.length;i++)
{
if(fh[i].equals("*"))
{
double sum=0;
sum=Double.parseDouble(shu[i-1])*Double.parseDouble(shu[i]);
shu[i-1]=Double.toString(0);
shu[i]=Double.toString(sum);
fh[i]="#";
}
if(fh[i].equals("/"))
{
double sum=0;
sum=Double.parseDouble(shu[i-1])/Double.parseDouble(shu[i]);
shu[i-1]=Double.toString(0);
shu[i]=Double.toString(sum);
fh[i]="#";
}
}
for(int i=1;i<fh.length;i++)
{
if(fh[i].equals("-"))
{
double sum=0;
int n=i;
for(int j=i;j<fh.length;j++)
{
if(fh[j].equals("#"))
{
n++;
}
}
sum=Double.parseDouble(shu[i-1])-Double.parseDouble(shu[n]);
shu[i-1]=Double.toString(0);
shu[n]=Double.toString(sum);
fh[i]="+";
}
}
sum1=Double.parseDouble(shu[0]);
for(int i=1;i<shu.length;i++)
{
sum1+=Double.parseDouble(shu[i]);
}
text.setText(Double.toString(sum1));
str.delete(0, str.length());
str.append(text.getText());
strlen=0;
str2.delete(0, str2.length());
str2.append(text.getText());
press2=0;
}
public static void main(String args[])
{
Calculate cal=new Calculate("1");
}
}
And here is the Calculator I stumbled on that uses Stacks but doesn't use GUI
import java.util.*;
public class rpnCalc
{
public static void main(String[] Args)
{
String str;
String[] tokens;
double result;
Stack<Double> operands = new Stack();
Stack<String> operators = new Stack();
Scanner kb = new Scanner(System.in);
//initialize varables
str = "";
result = 0;
System.out.print("Enter a simple expression,\nSeparate pieces with a space, example: 12 + 96, or 12 96 + \nPress q to exit\n");
System.out.println("All expressions are evaluated from RIGHT to LEFT.");
while(!str.equals("q"))
{
str = kb.nextLine(); //using the keyboard you enter the equation
tokens = str.split("\\s+"); //splits what you typed in.
fillStacks(operands,operators,tokens);
result = calculate(operands,operators);
System.out.println(result + "\nAnother Expression? (q to quit)");
} // end while
System.out.println("Thanks! Bye now!");
}//end main
/** Methods for Addition, Subtraction, Multiplication and Division */
private static double add(Stack<Double> stk)
{
double op2 = stk.pop();
double op1 = stk.pop();
double result = op1 + op2;
stk.push(result);
return result;
}// end add
private static double subtract(Stack<Double> stk)
{
double op2 = stk.pop();
double op1 = stk.pop();
double result = op1 - op2;
stk.push(result);
return result;
}// end subtract
private static double divide(Stack<Double> stk)
{
double op2 = stk.pop();
double op1 = stk.pop();
double result = op1 / op2;
stk.push(result);
return result;
}//end divide
private static double multiply(Stack<Double> stk)
{
double op2 = stk.pop();
double op1 = stk.pop();
double result = op1 * op2;
stk.push(result);
return result;
}//end multiply
/**Method for error checking user input. If parseInt fails, this method is invoked, and determines whether input is invalid,
or an operator.*/
public static boolean isOperator(String str)
{
boolean tf;
if(str.equals("+") || str.equals("-") || str.equals("/") || str.equals("*"))
tf = true;
else if(str.equals("q") || str.equals("Q"))
tf = false;
else
{
tf = false;
System.out.println("Invalid input. Please try again.");
}
return tf;
}//end isOperator
/**Methods for filling stacks and evaluating expressions.*/
private static void fillStacks(Stack<Double> stkd, Stack<String> stks,String[] str)
{
boolean isOp;
for(int i = 0; i < str.length; i++)
{
try
{
stkd.push(Double.parseDouble(str[i]));
}//end try
catch (NumberFormatException e)
{
isOp = isOperator(str[i]);
if(isOp == true)
stks.push(str[i]);
}//end catch
}//end for
}//end fillStacks
/**perform calculations based on operators, loop until operator stack is empty*/
private static double calculate(Stack<Double> stkd, Stack<String> stks)
{
double result = 0;
String str = "";
while(!stks.empty())
{
str = stks.pop();
if(str.equals("+"))
result = add(stkd);
else if(str.equals("-"))
result = subtract(stkd);
else if(str.equals("/"))
result = divide(stkd);
else if(str.equals("*"))
result = multiply(stkd);
}//end while
return result;
}
}//end rpnCalc
and please don't try reporting this because I am not asking anyone to write the full code for me, just tell me what i should do. thank you.
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