Calculator Challenge

Now that you know how to write functions and use control structures like if statements and switches, let's try to write a simple calculator.

Instructions:

Create a function called calculator that takes three parameters: num1, num2 and operator. The operator can be +, -, * or /. The function should return the result of the calculation. If anything other than the four operators is passed in, the function should return an error message.

Example:

calculator(5, 2, '+') // returns 7
calculator(5, 2, '-') // returns 3
calculator(5, 2, '*') // returns 10
calculator(5, 2, '/') // returns 2.5
calculator(5, 2, '%') // returns an error message

Hint:

• You can use an if statement to the operator, but this is a good example for using a switch statement.

Click For Solution

function calculator(num1, num2, operator) {
let result;
switch (operator) {
  case '+':
    result = num1 + num2;
    break;
  case '-':
    result = num1 - num2;
    break;
  case '*':
    result = num1 * num2;
    break;
  case '/':
    result = num1 / num2;
    break;
  default:
    result = 'Invalid operator';
}
console.log(result);
return result;
}

calculator(3, 4, '*'); // returns 12