Java-core-mastery/consolecalculator.java at main · Riyasharma-17/Java-core-mastery · GitHub

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import java.util.Scanner;

public class consolecalculator {


    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);


        while (true) {


            double a = getNumber(sc, "Enter input a: ");

            char op = getOperator(sc);

            double b = getNumber(sc, "Enter input b: ");


            double result = calculate(a, op, b);


            if (Double.isNaN(result)) {
    if (op == '/' && b == 0)
        System.out.println("Error: Cannot divide by zero!");
    else
        System.out.println("Error: Invalid operation!");
}


            if (!askToContinue(sc)) {

                break;

            }

        }


        sc.close();

    }


    // Method to get number input

    public static double getNumber(Scanner sc, String message) {

        System.out.print(message);

        return sc.nextDouble();

    }
    // Method to get operator

    public static char getOperator(Scanner sc) {

        System.out.print("Enter operator (+, -, *, /): ");

        return sc.next().charAt(0);

    }


    // Method to perform calculation

    public static double calculate(double a, char op, double b) {


        switch (op) {

            case '+':

                return a + b;


            case '-':

                return a - b;


            case '*':

                return a * b;


            case '/':

                if (b == 0) {
                    return Double.NaN;

                }

                return a / b;


            default:

                return Double.NaN;

        }

    }


    // Method to ask user whether to continue

    public static boolean askToContinue(Scanner sc) {

        System.out.print("Do you want to continue? (y/n): ");

        char choice = sc.next().charAt(0);

        return Character.toLowerCase(choice) == 'y';

    }

}