How do I print the return value on the console?

April 12, 2022

I’ve got a course task to make a calculator in Javascript. I’ve got the functions for the different operators and the case-switch but I’m struggling with how to print the return values of the functions. Here’s the code I’ve got so far:

let firstValue = prompt("Enter a number");

let secondValue = prompt("Enter a second number");

let operation = prompt("How should these numbers interact");

function addition(firstValue, secondValue) {
  return firstValue + secondValue;
}

function subtraction(firstValue, secondValue) {
  return firstValue - secondValue;
}

function division(firstValue, secondValue) {
  return firstValue / secondValue;
}

function multiplication(firstValue, secondValue) {
  return firstValue * secondValue;
}

function powerTo(firstValue, secondValue) {
  return firstValue ^ secondValue;
}

switch (operation) {
  case "+":
    addition();
    break;
  case "-":
    subtraction();
    break;
  case "/":
    division();
    break;
  case "*":
    multiplication();
    break;
  case "^":
    powerTo();
    break;
  default:
    console.log("No operation inputted");
    break;
}

console.log(`${firstValue} ${operation} ${secondValue} =`)

>Solution :

Assign the result of calling the operation function to a variable, then display that in the console.

You also need to pass arguments to all the functions.

And you should convert the input to a number before using it in calculations. Most of the arithmetic operators will convert it automatically, but + will do string concatenation.

let firstValue = Number(prompt("Enter a number"));

let secondValue = Number(prompt("Enter a second number"));

let operation = prompt("How should these numbers interact");

function addition(firstValue, secondValue) {
  return firstValue + secondValue;
}

function subtraction(firstValue, secondValue) {
  return firstValue - secondValue;
}

function division(firstValue, secondValue) {
  return firstValue / secondValue;
}

function multiplication(firstValue, secondValue) {
  return firstValue * secondValue;
}

function powerTo(firstValue, secondValue) {
  return firstValue ^ secondValue;
}

let result;

switch (operation) {
  case "+":
    result = addition(firstValue, secondValue);
    break;
  case "-":
    result = subtraction(firstValue, secondValue);
    break;
  case "/":
    result = division();
    break;
  case "*":
    result = multiplication(firstValue, secondValue);
    break;
  case "^":
    result = powerTo(firstValue, secondValue);
    break;
  default:
    console.log("No operation inputted");
    break;
}

console.log(`${firstValue} ${operation} ${secondValue} = ${result}`)