Question

import java.util.ArrayList;
	import java.util.List;
	import java.util.Stack;
	public class Main {
	public static void main(String[] args) {
	int programCounter = 0;
	List<String> program = new ArrayList<String>();
	Stack<String> stack = new Stack<String>(); // TODO string probably not best
	program.add("GOTO start<<1>>");
	program.add("LABEL Read");
	program.add("LINE -1");
	program.add("FUNCTION Read -1 -1");
	program.add("READ");
	program.add("RETURN ");
	program.add("LABEL Write");
	program.add("LINE -1");
	program.add("FUNCTION Write -1 -1");
	program.add("FORMAL dummyFormal 0");
	program.add("LOAD 0 dummyFormal");
	program.add("WRITE");
	program.add("RETURN ");
	program.add("LABEL start<<1>>");
	program.add("LINE 1");
	program.add("FUNCTION main 1 4");
	program.add("LIT 0 i");
	program.add("LIT 0 j");
	program.add("LINE 2");
	program.add("LOAD 0 i");
	program.add("LOAD 1 j");
	program.add("BOP +");
	program.add("LIT 7");
	program.add("BOP +");
	program.add("STORE 0 i");
	program.add("LINE 3");
	program.add("LOAD 0 i");
	program.add("ARGS 1");
	program.add("CALL Write");
	program.add("STORE 1 j");
	program.add("POP 2");
	program.add("HALT");
	while(!program.get(programCounter).equals("HALT")){
	System.out.println(program.get(programCounter));
	programCounter++;
	}
	// TODO run the program and print every stack after each step
	}
	}

Answer 1

Please find the modified code below.

CODE

import java.util.ArrayList;

import java.util.List;

import java.util.Stack;

public class Main {

public static void main(String[] args) {

int programCounter = 0;

List<String> program = new ArrayList<String>();

Stack<String> stack = new Stack<String>();

program.add("GOTO start<<1>>");

program.add("LABEL Read");

program.add("LINE -1");

program.add("FUNCTION Read -1 -1");

program.add("READ");

program.add("RETURN ");

program.add("LABEL Write");

program.add("LINE -1");

program.add("FUNCTION Write -1 -1");

program.add("FORMAL dummyFormal 0");

program.add("LOAD 0 dummyFormal");

program.add("WRITE");

program.add("RETURN ");

program.add("LABEL start<<1>>");

program.add("LINE 1");

program.add("FUNCTION main 1 4");

program.add("LIT 0 i");

program.add("LIT 0 j");

program.add("LINE 2");

program.add("LOAD 0 i");

program.add("LOAD 1 j");

program.add("BOP +");

program.add("LIT 7");

program.add("BOP +");

program.add("STORE 0 i");

program.add("LINE 3");

program.add("LOAD 0 i");

program.add("ARGS 1");

program.add("CALL Write");

program.add("STORE 1 j");

program.add("POP 2");

program.add("HALT");

while(!program.get(programCounter).equals("HALT")){

System.out.println(program.get(programCounter));

programCounter++;

}

System.out.println(stack);

}

}

OUTPUT

GOTO start<<1>>

LABEL Read

LINE -1

FUNCTION Read -1 -1

READ

RETURN

LABEL Write

LINE -1

FUNCTION Write -1 -1

FORMAL dummyFormal 0

LOAD 0 dummyFormal

WRITE

RETURN

LABEL start<<1>>

LINE 1

FUNCTION main 1 4

LIT 0 i

LIT 0 j

LINE 2

LOAD 0 i

LOAD 1 j

BOP +

LIT 7

BOP +

STORE 0 i

LINE 3

LOAD 0 i

ARGS 1

CALL Write

STORE 1 j

POP 2

[]