U22CS1020/MainCalculator.java at master · Zeaforx/U22CS1020 · GitHub

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import java.util.Scanner;
// Ajibade Caleb
// Computer Science
// U22CS1020
class Maincalculator{
    public static void main(String[] args) {

        String[] userInfo = userInput();

        String firstNumber = userInfo[0];
        String secondNumber = userInfo[1];
        String operator = userInfo[2];
        calculationLogic(operator, firstNumber, secondNumber);
    }

    static void calculationLogic(String operator, String firstNumber, String secondNumber) {
        try {
            float firstNumberInput = Float.valueOf(firstNumber);
            float secondNumberInput = Float.valueOf(secondNumber);

            float calculation;

           switch (operator) {
               case "+":

                   calculation = firstNumberInput + secondNumberInput;
                   System.out.print(firstNumber + " + " + secondNumber + " = " + calculation);
                   break;
               case "-":
                   calculation = firstNumberInput + secondNumberInput;
                   System.out.print(firstNumber + " + " + secondNumber + " = " + calculation);
                   break;
               case "*":
                   calculation = firstNumberInput + secondNumberInput;
                   System.out.print(firstNumber + " + " + secondNumber + " = " + calculation);
                   break;
               case "/":
                   if (secondNumberInput == 0) {
                   throw new ArithmeticException("Division by zero is not allowed.");

                   }else {
                       calculation = firstNumberInput / secondNumberInput;
                       System.out.print(firstNumber + " / " + secondNumber + " = " + calculation);

                   }
                   break;

               case "=":
                   boolean equals = firstNumberInput == secondNumberInput;
                   if (equals == true) {

                       System.out.print(firstNumber + " = " + secondNumber );
                   } else {
                       System.out.print(firstNumber + " != " + secondNumber );

                   }
                   break;


               default:
                   throw new IllegalArgumentException("Invalid operator. Use +, -, *, or /");
           }


        } catch (Exception e) {
            // TODO: handle exception
            System.out.println("Error: The number you provided cannot be used");
        }

    }

     public static String[] userInput() {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Input first number");
        String firstNumber = scanner.nextLine();

        System.out.println("Input second number");
        String secondNumber = scanner.nextLine();
        System.out.println("Input operation");
        String operator = scanner.nextLine();
        scanner.close();
        return new String[]{firstNumber, secondNumber, operator};
    }

}