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I was trying to obtain a random number rounded off to its first decimal place. I got what I wanted with the following code,

(Math.floor(Math.random() * 100) / 10)

But when trying to deduct a value from the output, I had unexpected decimals showing up for some numbers.

(Math.floor(Math.random() * 100) / 10) - 1 //When deducting the problem occurs.

Any clues as to why this is happening?

Sample output in jsfiddle

satilog
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1 Answers1

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Use Math.round

var number = document.getElementById("num");
setInterval(function() {
   number.innerHTML = Math.round(Math.floor(Math.random() * 100) / 10) - 1;
 }, 1000);
<p id="num" style="color:black">asd</p>
brk
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