Why does If Else statment not output anything?

Question

Attempting to have the user input four numbers, where they are, and their destination. Then have the output which direction they will be heading.
No matter which values I enter the same thing happens. How can I make the code use the results of the prompts?

var output = document.getElementById("output");
var number=prompt ("What is your current Latitude?");
var number=prompt ("What is your current Longitude?");
var number=prompt ("What is your destination Latitude?");
var number=prompt ("What is your destination longitude?");


var intCurrentLatitude = 0;
var intCurrentLongitude = 0;
var intDestinationLatitude = 0;
var intDestinationLongitude = 0;

if ( (intCurrentLatitude<=intDestinationLatitude) && (intCurrentLongitude<=intDestinationLongitude) ) {
output.textContent = "We'd be headed North East, capt'n!";
}
else if ( ( intCurrentLatitude<=intDestinationLatitude) && (intCurrentLongitude>=intDestinationLongitude) ) {
    output.textContent = "Ye'd best head North West, captain!";
}
else if ( ( intCurrentLatitude>=intDestinationLatitude) && (intCurrentLongitude>=intDestinationLongitude) ) {
output.textContent = "Ye'd best head South West, captain!";
}
else if ( ( intCurrentLatitude>=intDestinationLatitude) && (intCurrentLongitude<=intDestinationLongitude) ) {
output.textContent = "Ye'd best head South East, captain!";
}
else{
output.textContent = "Land Ho!";
}

HTML

<head>
<meta charset="utf-8">
  <title>More if</title>

<body>
 <div id= "output">


 <div id= "input2">
    </div>

</body>


<script src="moreif.js"></script>
<script src="moreif2.js"></script>
</head>
</html>

*"seems to be doing nothing"* is not a proper technical problem description. Any errors thrown? — charlietfl, Jun 01 '16 at 23:48
Side note: `prompt()` returns string values. You'll need to convert them if you want number values. [How do I convert a string into an integer in JavaScript?](https://stackoverflow.com/questions/1133770/how-do-i-convert-a-string-into-an-integer-in-javascript) — Jonathan Lonowski, Jun 01 '16 at 23:52

score 2 · Answer 1 · answered Jun 01 '16 at 23:49

I'm not sure what you're trying to accomplish, but the code is doing exactly what it's supposed to. Each of your conditions are asking if a variable is "less than or equal to zero".

The variables you're testing are all at 0, so the first condition fulfills and your program exits.

score 1 · Accepted Answer · answered Jun 01 '16 at 23:49

You kept changing the number value and prompt returns a string. Use parseFloat to convert a decimal in string form to a number. You did not use the result of the prompts.

var output = document.getElementById("output");

var intCurrentLatitude = parseFloat(prompt("What is your current Latitude?"));
var intCurrentLongitude = parseFloat(prompt("What is your current Longitude?"));
var intDestinationLatitude = parseFloat(prompt("What is your destination Latitude?"));
var intDestinationLongitude = parseFloat(prompt("What is your destination longitude?"));

if ( (intCurrentLatitude<=intDestinationLatitude) && (intCurrentLongitude<=intDestinationLongitude) ) {
output.textContent = "We'd be headed North East, capt'n!";
}
else if ( ( intCurrentLatitude<=intDestinationLatitude) && (intCurrentLongitude>=intDestinationLongitude) ) {
    output.textContent = "Ye'd best head North West, captain!";
}
else if ( ( intCurrentLatitude>=intDestinationLatitude) && (intCurrentLongitude>=intDestinationLongitude) ) {
output.textContent = "Ye'd best head South West, captain!";
}
else if ( ( intCurrentLatitude>=intDestinationLatitude) && (intCurrentLongitude<=intDestinationLongitude) ) {
output.textContent = "Ye'd best head South East, captain!";
}
else{
output.textContent = "Land Ho!";
}

<head>
<meta charset="utf-8">
  <title>More if</title>

<body>
 <div id= "output">


 <div id= "input2">
    </div>

</body>


<script src="moreif.js"></script>
<script src="moreif2.js"></script>
</head>
</html>

Why does If Else statment not output anything?

2 Answers2