I'm facing a problem to get the digit of a number after decimal point. I need the digit to do if else statement.
Here is an example:
31.30 = 31.30 31.31 = 31.30 31.32 = 31.30 31.33 = 31.35 31.34 = 31.35 31.35 = 31.35 31.36 = 31.35 31.37 = 31.35 31.38 = 31.40 31.39 = 31.30
So, I need to get the second digit after decimal point. Then, i can use the digit to do if else statement. This rounding issue is happening in Malaysia.
Something like this might work for doing the rounding to the nearest 5 cents, although then you may need to format the output to have the proper number of digits past the decimal point:
var origVal = 31.34;
var roundedVal = Math.round(origVal*20)/20;
Which would give you 31.35, i.e., rounded to the nearest nickel.
This seems a little more direct than getting the digit and doing an if/else.
for a part of your question
you can round javascript to specific precision by
Link :Number rounding in JavaScript
var original=28.453
1) //round "original" to two decimals
var result=Math.round(original*100)/100 //returns 28.45
2) // round "original" to 1 decimal
var result=Math.round(original*10)/10 //returns 28.5
3) //round 8.111111 to 3 decimals
var result=Math.round(8.111111*1000)/1000 //returns 8.111
from How can I round down a number in Javascript?
Round towards negative infinity - Math.floor()
+3.5 => +3.0 -3.5 => -4.0 Round towards zero - usually called Truncate(), but not supported by JavaScript - can be emulated by using Math.ceil() for negative numbers and Math.floor() for positive numbers.
+3.5 => +3.0 using Math.floor() -3.5 => -3.0 using Math.ceil()
