i need help with my java program. Its having trouble running and I need help making sure it works. Please post the results and output for it. Heres my code and below are also what the program is supposed to do. import java.util.*; public class SimpleCalculator { private final String input; private int position; private boolean hasDivByZero = false; private Map symbolTable; private List instructions; public SimpleCalculator(String input) { this.input = input; this.position = 0; this.symbolTable = new HashMap<>(); this.instructions = new ArrayList<>(); } public static void main(String[] args) { SimpleCalculator calculator = new SimpleCalculator("3 + 5 * (2 - 1)"); calculator.parseExpression(); if (calculator.hasDivByZero) { System.out.println("Error: division by zero"); } else { System.out.println("Result: " + calculator.instructions); } } public void parseExpression() { parseTerm('+'); } public String parseTerm(char op) { String t1 = parseFactor(); while (peek() == op || peek() == '/') { char operator = consume(); String t2 = parseFactor(); if (operator == '/' && t2.equals("0")) { hasDivByZero = true; break; } String result = newTemp(); emit(result + " = " + t1 + " " + operator + " " + t2); t1 = result; } return t1; } public String parseFactor() { if (consume('(')) { String result = parseExpression(); consume(')'); return result; } StringBuilder sb = new StringBuilder(); while (Character.isDigit(peek())) { sb.append(consume()); } String variable = sb.toString(); Optional.ofNullable(symbolTable.get(variable)) .filter(type -> type.equals("int")) .orElseThrow(() -> new IllegalArgumentException("Error: " + variable + " is not defined or not an integer")); return variable; } private String newTemp() { String temp = "t" + (instructions.size() + 1); symbolTable.put(temp, "int"); return temp; } private void emit(String instruction) { instructions.add(instruction); } private char consume() { return input.charAt(position++); } private boolean consume(char c) { if (peek() == c) { position++; return true; } return false; } private char peek() { return position < input.length() ? input.charAt(position) : '\0'; } }

i need help with my java program. Its having trouble running and I need help making sure it works. Please post the results and output for it. Heres my code and below are also what the program is supposed to do. import java.util.; public class SimpleCalculator { private final String input; private int position; private boolean hasDivByZero = false; private Map symbolTable; private List instructions; public SimpleCalculator(String input) { this.input = input; this.position = 0; this.symbolTable = new HashMap<>(); this.instructions = new ArrayList<>(); } public static void main(String[] args) { SimpleCalculator calculator = new SimpleCalculator("3 + 5 (2 - 1)"); calculator.parseExpression(); if (calculator.hasDivByZero) { System.out.println("Error: division by zero"); } else { System.out.println("Result: " + calculator.instructions); } } public void parseExpression() { parseTerm('+'); } public String parseTerm(char op) { String t1 = parseFactor(); while (peek() == op || peek() == '/') { char operator = consume(); String t2 = parseFactor(); if (operator == '/' && t2.equals("0")) { hasDivByZero = true; break; } String result = newTemp(); emit(result + " = " + t1 + " " + operator + " " + t2); t1 = result; } return t1; } public String parseFactor() { if (consume('(')) { String result = parseExpression(); consume(')'); return result; } StringBuilder sb = new StringBuilder(); while (Character.isDigit(peek())) { sb.append(consume()); } String variable = sb.toString(); Optional.ofNullable(symbolTable.get(variable)) .filter(type -> type.equals("int")) .orElseThrow(() -> new IllegalArgumentException("Error: " + variable + " is not defined or not an integer")); return variable; } private String newTemp() { String temp = "t" + (instructions.size() + 1); symbolTable.put(temp, "int"); return temp; } private void emit(String instruction) { instructions.add(instruction); } private char consume() { return input.charAt(position++); } private boolean consume(char c) { if (peek() == c) { position++; return true; } return false; } private char peek() { return position < input.length() ? input.charAt(position) : '\0'; } }

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

i need help with my java program. Its having trouble running and I need help making sure it works. Please post the results and output for it.

Heres my code and below are also what the program is supposed to do.
import java.util.*;

public class SimpleCalculator {

private final String input;
private int position;
private boolean hasDivByZero = false;
private Map<String, String> symbolTable;
private List<String> instructions;

public SimpleCalculator(String input) {
this.input = input;
this.position = 0;
this.symbolTable = new HashMap<>();
this.instructions = new ArrayList<>();
}

public static void main(String[] args) {
SimpleCalculator calculator = new SimpleCalculator("3 + 5 * (2 - 1)");
calculator.parseExpression();
if (calculator.hasDivByZero) {
System.out.println("Error: division by zero");
} else {
System.out.println("Result: " + calculator.instructions);
}
}

public void parseExpression() {
parseTerm('+');
}

public String parseTerm(char op) {
String t1 = parseFactor();

while (peek() == op || peek() == '/') {
char operator = consume();
String t2 = parseFactor();

if (operator == '/' && t2.equals("0")) {
hasDivByZero = true;
break;
}

String result = newTemp();
emit(result + " = " + t1 + " " + operator + " " + t2);
t1 = result;
}

return t1;
}

public String parseFactor() {
if (consume('(')) {
String result = parseExpression();
consume(')');
return result;
}

StringBuilder sb = new StringBuilder();
while (Character.isDigit(peek())) {
sb.append(consume());
}

String variable = sb.toString();

Optional.ofNullable(symbolTable.get(variable))
.filter(type -> type.equals("int"))
.orElseThrow(() -> new IllegalArgumentException("Error: " + variable + " is not defined or not an integer"));

return variable;
}

private String newTemp() {
String temp = "t" + (instructions.size() + 1);
symbolTable.put(temp, "int");
return temp;
}

private void emit(String instruction) {
instructions.add(instruction);
}

private char consume() {
return input.charAt(position++);
}

private boolean consume(char c) {
if (peek() == c) {
position++;
return true;
}
return false;
}

private char peek() {
return position < input.length() ? input.charAt(position) : '\0';
}
}