Question

Javascript что за код?????? // Define global variables to store the user inputs let num1;let num2;// Function to prompt users to enter two numbersfunction getInput() { num1 = parseFloat(prompt('Enter a number: ')); num2 = parseFloat(prompt('Enter a second number: '));}// Function to add the two numbersfunction add() { getInput(); let sum = num1 + num2; alert('The sum is: ' + sum);}// Function to subtract the two numbersfunction subtract() { getInput(); let difference = num1 - num2; alert('The difference is: ' + difference);}// Function to multiply the two numbersfunction multiply() { getInput(); let product = num1 * num2; alert('The product is: ' + product);}// Function to divide the two numbersfunction divide() { getInput(); let quotient = num1 / num2; alert('The quotient is: ' + quotient);}```​

Answer 1

Ответ:

Этот код на языке JavaScript описывает набор функций для выполнения математических операций с двумя числами, введенными пользователем через диалоговое окно. Код содержит четыре функции: add() для сложения, subtract() для вычитания, multiply() для умножения и divide() для деления. Каждая функция вызывает функцию getInput(), которая запрашивает у пользователя два числа и сохраняет их в глобальных переменных num1 и num2. Затем каждая функция выполняет соответствующую математическую операцию и выводит результат в виде диалогового окна.

Объяснение:

Answer 2

The provided code is a JavaScript code snippet that defines several functions for performing basic arithmetic operations on user-inputted numbers. Let's break it down step by step:

Global Variables

The code starts by defining two global variables, `num1` and `num2`, which will be used to store the user inputs. These variables are initially undefined.

Function to Prompt User Inputs

The `getInput()` function is defined to prompt the users to enter two numbers. It uses the `parseFloat()` function to convert the user inputs from strings to floating-point numbers and adds them to the `num1` and `num2` variables.

Function to Add the Numbers

The `add()` function is defined to add the two numbers. It calls the `getInput()` function to get the user inputs, then calculates the sum of `num1` and `num2` and stores it in a variable called `sum`. Finally, it displays an alert message with the sum.

Function to Subtract the Numbers

The `subtract()` function is defined to subtract the second number from the first number. It follows a similar structure to the `add()` function, but instead of calculating the sum, it calculates the difference and displays it in an alert message.

Function to Multiply the Numbers

The `multiply()` function is defined to multiply the two numbers. It also calls the `getInput()` function to get the user inputs, then calculates the product of `num1` and `num2` and displays it in an alert message.

Function to Divide the Numbers

The `divide()` function is defined to divide the first number by the second number. It follows a similar structure to the previous functions, but instead of calculating the product or sum, it calculates the quotient and displays it in an alert message.

Overall, this code allows users to input two numbers and perform basic arithmetic operations such as addition, subtraction, multiplication, and division on those numbers.

Please note that the code snippet you provided has some syntax errors. For example, there are unnecessary `+` symbols after each line, and the variables `sum`, `difference`, `product`, and `quotient` are not properly initialized. To fix these issues, the code should be modified. Here's an updated version of the code:

// Define global variables to store the user inputs
let num1;
let num2;

// Function to prompt users to enter two numbers
function getInput() {
  num1 = parseFloat(prompt('Enter a number:'));
  num2 = parseFloat(prompt('Enter a second number:'));
}

// Function to add the two numbers
function add() {
  getInput();
  let sum = num1 + num2;
  alert('The sum is: ' + sum);
}

// Function to subtract the two numbers
function subtract() {
  getInput();
  let difference = num1 - num2;
  alert('The difference is: ' + difference);
}

// Function to multiply the two numbers
function multiply() {
  getInput();
  let product = num1 * num2;
  alert('The product is: ' + product);
}

// Function to divide the two numbers
function divide() {
  getInput();
  let quotient = num1 / num2;
  alert('The quotient is: ' + quotient);
}

Now the code should work as intended.