Why 9.1 + 3.3 is not 12.4 ?
<script>
alert( 9.1 + 3.3 )
</script>
result: 12.399999999
…and how should I sum it?
Why 9.1 + 3.3 is not 12.4 ? <script> alert( 9.1 + 3.3 )
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Why 9.1 + 3.3 is not 12.4 ?
<script>
alert( 9.1 + 3.3 )
</script>
result: 12.399999999
…and how should I sum it?
This is a floating point error, where the variable cannot store the value precisely. If you are only working to one decimal place, then you could multiply all of your figures by 10 to do calculations as this will keep all the numbers as integers and you shouldn’t get the problem you are seeing. Obviously when displaying the number you will have to divide it by 10.