Question 251588 in Javascript Question posted in
A very good W3school tutorial can be found here.

Could you please tell me what's wrong this javascript code

This code is supposed to calculate the sum, substract, multiply, divide at the same time when the user types in x and y but it’s showing Nan

function perform(x, y) {
  x = prompt("enter first no. ")
  y = prompt(" enter second no. ")

  function sum(x, y) {
    console.log(parseInt(x + y));
  }

  sum();

  function minus(x, y) {
    console.log(parseInt(x - y));
  }

  minus();

  function multiply(x, y) {
    console.log(parseInt(x * y));
  }

  multiply();
  
  function divide(x, y) {
    console.log(parseInt(x / y));
  }

  divide();
}
Tags:

2

Answers


  1. 0

    Both X and Y are strings, when entered via the prompt dialog. You need to parse them separately before adding them, e.g.:

    function sum(x, y) {
    console.log(parseInt(x) + parseInt(y));
}

    In addition, you are calling all the methods without providing the variable inputs, so instead of sum(), you should call sum(x,y)

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  2. 0

    prompt will return A string containing the text entered by the user, or null. as stated in the mdn docs: https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt

    So instead of parseInt(x - y) you should first parse each input into a integer (or float) and then do the addition, multiplication etc.

    (function perform() {
  const x = parseInt(prompt("enter first no. "))
  const y = parseInt(prompt("enter second no. "))

  sum(x, y);
  minus(x, y);
  multiply(x, y);
  divide(x, y);
})();

function sum(x, y) {
  console.log(x + y);
}

function minus(x, y) {
  console.log(x - y);
}

function divide(x, y) {
  console.log(x / y);
}

function multiply(x, y) {
  console.log(x * y);
}

    and please read the so link commented by @Ivar

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