GeezerVison

The World Wide Web, restored to 800 pixels of glory.

GeezerVison is showing javascript.info — Show the sign

Tutorial
The JavaScript language
JavaScript Fundamentals
Conditional branching: if, '?'

back to the lesson

Show the sign

importance: 2

Using if..else, write the code which gets a number via prompt and then shows in alert:

1, if the value is greater than zero,
-1, if less than zero,
0, if equals zero.

In this task we assume that the input is always a number.

Demo in new window

let value = prompt('Type a number', 0);

if (value > 0) {
  alert( 1 );
} else if (value < 0) {
  alert( -1 );
} else {
  alert( 0 );
}

You are visitor 01402503 — GeezerVison does not store the pages you look up.
Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required.