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Calculator.java

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package BasicJavaPrograms.FunctionsMethods;

import java.util.Scanner;

public class Calculator {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int choice;

do {

System.out.println("\n--- Calculator Menu ---");

System.out.println("1. Addition");

System.out.println("2. Subtraction");

System.out.println("3. Multiplication");

System.out.println("4. Division");

System.out.println("5. Exit");

System.out.print("Enter your choice: ");

choice = sc.nextInt();

if (choice >= 1 && choice <= 4) {

System.out.print("Enter the first number: ");

int num1 = sc.nextInt();

System.out.print("Enter the second number: ");

int num2 = sc.nextInt();

switch (choice) {

case 1:

System.out.println("Result: " + add(num1, num2));

break;

case 2:

System.out.println("Result: " + subtract(num1, num2));

break;

case 3:

System.out.println("Result: " + multiply(num1, num2));

break;

case 4:

try {

System.out.println("Result: " + divide(num1, num2));

} catch (IllegalArgumentException e) {

System.out.println("Error: " + e.getMessage());

}

break;

}

} else if (choice == 5) {

System.out.println("Exiting Calculator. Goodbye!");

} else {

System.out.println("Invalid choice. Please try again.");

}

} while (choice != 5);

sc.close();

}

public static int add(int a, int b) {

return a + b;

}

public static int subtract(int a, int b) {

return a - b;

}

public static int multiply(int a, int b) {

return a * b;

}

public static double divide(int a, int b) {

if (b == 0) {

throw new IllegalArgumentException("Cannot divide by zero");

}

return (double) a / b;

}

}