javascript_exercises/Exercise_02.html at master · Aeesh/javascript_exercises · 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>Calculator</title>
</head>
<body>
    <script>


        // addition function
        add = (num1, num2) => alert(num1+ '+' + num2 + ' = '+ (num1 + num2));

        // subtraction function
        sub = (num1, num2) => alert(num1+ '-' + num2 + ' = '+ (num1 - num2));

        // multiplication function
        mul = (num1, num2) => alert(num1+ '*' + num2 + ' = '+ (num1 * num2));

        // division function
        div = (num1, num2) => alert(num1+ '/' + num2 + ' = '+ (num1 / num2));

        // calling calc function
        calc();

        function calc(){
            var value1 = Number(prompt('enter first number'));
            var value2 = Number(prompt('enter second number'));
            do{
                var operation = Number(prompt ('select operation to perform:\n 1. Addition\n 2. subtraction\n 3. multiplication\n 4. Division'));
                if(operation===1){
                    add(value1, value2);
                }
                else if(operation===2){
                    sub(value1, value2);
                }
                else if(operation===3){
                    mul(value1, value2);
                }
                else if(operation===4){
                    div(value1, value2);
                }
                else{
                    alert('please select an operation!');
                }
            }
                while(!operation);

            var check = confirm('would you like to carry out another operation?');
            if(check){
                calc();
            }
            else{
               alert('you clicked cancel, bye!');
            }
        }


    </script>
</body>
</html>