Truncate Two Decimal Places Without Rounding

Truncate Two decimal places without rounding

value = Math.Truncate(100 * value) / 100;

Beware that fractions like these cannot be accurately represented in floating point.

Truncate number to two decimal places without rounding

Convert the number into a string, match the number up to the second decimal place:

function calc(theform) {    var num = theform.original.value, rounded = theform.rounded    var with2Decimals = num.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0]    rounded.value = with2Decimals}
<form onsubmit="return calc(this)">Original number: <input name="original" type="text" onkeyup="calc(form)" onchange="calc(form)" /><br />"Rounded" number: <input name="rounded" type="text" placeholder="readonly" readonly></form>

How do I get 2 place decimal without rounding off in MySQL?

TRUNCATE()

MySQL TRUNCATE() returns a number after truncated to certain decimal places. The number and the number of decimal places are specified as arguments of the TRUNCATE function.

  SELECT TRUNCATE(DateColumn,n) from TableName;

example:

  SELECT TRUNCATE(25.21512,2) from dual;

result:

-> 25.21

I want to show only the decimal places "Truncate floats without rounding"

If you don't want to round numbers, you can truncate floats with string operations like this:

def truncate_number(num, limit):
int_part, fract_part = str(float(num)).split('.')
return float(f'{int_part}.{fract_part[:limit]}')

In [9]: truncate_number(35.3169, 2)
Out[9]: 35.31

In [9]: truncate_number(1.1199, 2)
Out[9]: 1.11

In [11]: truncate_number(1.1199, 3)
Out[11]: 1.119

In [11]: truncate_number(-1.1199, 3)
Out[11]: -1.119

Keep in mind that this function wont convert 1 to 1.000:

In [13]: truncate_number(1, 3)
Out[13]: 1.0

Truncate decimal places without rounding

You can use floor here

<xsl:value-of select='format-number(floor(17.99), "0")' /> <!-- 17 -->
<xsl:value-of select='format-number(floor(19.01), "0")' /> <!-- 19 -->
<xsl:value-of select='format-number(floor(18.0), "0")' /> <!-- 18 -->

In fact, you might not even need the format-number here

<xsl:value-of select='floor(17.99)' /> <!-- 17 -->
<xsl:value-of select='floor(19.01)' /> <!-- 19 -->
<xsl:value-of select='floor(18.0)' /> <!-- 18 -->

Truncate float (not rounded) to 2 decimal places

This can be done by dropping the extra digits you don't want by using multiplication and division. For example, if you want 0.994 to be 0.99, you can multiply by 100 (to cover 2 decimal places), then truncate the number, and then divide it back by 100 to it to the original decimal place.

example:

  0.994 * 100 = 99.4
99.4 truncated = 99.0
99.0 / 100 = 0.99

So here is a function that will do that:

const truncateByDecimalPlace = (value, numDecimalPlaces) =>
Math.trunc(value * Math.pow(10, numDecimalPlaces)) / Math.pow(10, numDecimalPlaces)

console.log(truncateByDecimalPlace(0.996, 2)) // 0.99


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