Question

Please help with program this. Thank you so much in advance!

Create a Java program which implements a simple stack machine. The machine has 6 instructions Push operand Puts a value on the stack. The operand is either a floating point literal or one of 10 memory locations designated MO M9 Pop operand Pops the value on the top of the stack and moves it to the memory location MO-M9 Add Pops the top two values off the stack, performs the operation, then pushes the result on the Sub stack. Note that the value that was pushed first comes first in the operation. Sub works like this, Mul t2 pop(), t1 pop(), t3 t1 - t2, push(t3) Div Requirements 1. The program must be written in Java. It may implement its own stack, or it may use the Java API Stack class. Only floating point values are stored on the stack and in memory 2. The instructions are read from the machine.txt file. 3. In addition to moving a value from the stack to memory, the Pop operation must display a message on the console. 4. This program does not have to deal with error conditions like stack underflow or invalid input 5. The program needs work for any valid input file. The instructor will test it with data that is different from this sample data

Answer 1

Example.java

package abc4;

import java.io.File;
import java.io.FileReader;
import java.util.Scanner;
import java.util.Stack;

public class Example {
  
   public static void main(String args[]) throws Exception{
       File file = new File("siva.txt");
       Scanner br = new Scanner(new FileReader(file));
      
       Stack<Float> stack = new Stack<Float>();
      
       float Memory[] = new float[10];

       while(br.hasNext()){
           String cmd = br.nextLine();
           if(!cmd.equals("")){
               if(cmd.startsWith("Push")){
                   if(cmd.charAt(5) == 'M'){
                       stack.push(Memory[Character.getNumericValue(cmd.charAt(6))]);
                   }else{
                       stack.push(Float.parseFloat(cmd.substring(5)));
                   }
               }
               else if(cmd.startsWith("Pop")){
                   if(cmd.charAt(4) == 'M'){
                       Memory[Character.getNumericValue(cmd.charAt(5))] = stack.pop();
                       System.out.println(Memory[Character.getNumericValue(cmd.charAt(5))]+" Stored in location M"+Character.getNumericValue(cmd.charAt(5)));
                   }else
                       stack.pop();
               }
               else if(cmd.startsWith("Add")){
                   float t2 = stack.pop();
                   float t1 = stack.pop();
                   stack.push(t1+t2);
               }
               else if(cmd.startsWith("Sub")){
                   float t2 = stack.pop();
                   float t1 = stack.pop();
                   stack.push(t1-t2);
               }
               else if(cmd.startsWith("Mul")){
                   float t2 = stack.pop();
                   float t1 = stack.pop();
                   stack.push(t1*t2);
               }
               else if(cmd.startsWith("Div")){
                   float t2 = stack.pop();
                   float t1 = stack.pop();
                   stack.push(t1/t2);
               }
           }
       }
   }

}

In this program I have used java's stack class.