JavaScript-Journey/04.2-built-in.html at main · oxidara/JavaScript-Journey · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Built-in Functions | Playground</title>
    <script>
        /*
            ---------------------------------------------------------
                             JavaScript Assignment
            ---------------------------------------------------------

            TASK:
            -----
            1. This simple program asks the user to enter two numbers.
            2. It multiplies the numbers and displays the result
               directly on the webpage.

            STUDENT ASSIGNMENT:
            --------------------
            Using this basic example, create a full calculator that
            can perform ALL of the following operations:

                1. Addition (+)
                2. Subtraction (-)
                3. Multiplication (*)
                4. Division (/)
                5. Modulus (%)

            REQUIREMENTS:
            --------------
            1. Ask the user to enter two values.
            2. Ask the user to choose which operation they want to perform.
            3. Use if/else to perform the operation.
            4. Display the final result on the page using document.write()
              or (preferably) using HTML elements + innerHTML.
            5. Make sure your calculator handles invalid input properly.

            ---------------------------------------------------------
        */

        let numone = parseInt(prompt("First Value"));
        let operator = prompt("Choose Operator in (+ - * / %)");
        let numtwo = parseInt(prompt("Second Value"));

        let result;

        if (!isNaN(numone) || !isNaN(numtwo)) {

            if (operator == "+") {
                result = numone + numtwo;
                document.write(numone + " " + operator + " " + numtwo + " = " + result);
            }
            else if (operator == "-") {
                result = numone - numtwo;
                document.write(numone + " " + operator + " " + numtwo + " = " + result);
            }
            else if (operator == "*") {
                result = numone * numtwo;
                document.write(numone + " x " + numtwo + " = " + result);
            }
            else if (operator == "/") {
                if (numtwo == 0) {
                    result = `Division by ${numtwo} is not allowed.`;
                    document.write(result);
                }

                else {
                    result = numone / numtwo;
                    document.write(numone + " " + operator + " " + numtwo + " = " + result);
                }
            }
            else if (operator == "%") {
                result = numone % numtwo;
                document.write(numone + " " + operator + " " + numtwo + " = " + result);
            }

            // ! = = -> Strict Value or Type

            else {
                result = `"${operator}" isn't a valid operator, Please enter valid operator.`;
                document.write(result);
            }

        }

        else if (numone.length == 0 || numtwo.length == 0 || operator.length == 0) {
            result = "We can't proceed with empty fields.";
            document.write(result);
        }

        else {
            result = "For calculation numeric values required.";
            document.write(result);
        }


    </script>
</head>
<body>
    <!-- ... empty ... -->
</body>
</html>