c# - Get decimals of a double? -


i have function adds double double need add digits after decimal point , number of digits varies based on size of number.

public double calculate(double x, double add)  {      string xstr;       if (x >= 10)          xstr = x.tostring("00.0000", numberformatinfo.invariantinfo);      if (x >= 100)          xstr = x.tostring("000.000", numberformatinfo.invariantinfo);      if (x < 10)          xstr = x.tostring("0.00000", numberformatinfo.invariantinfo);       string decimals = xstr.remove(0, xstr.indexof(".") + 1);      decimals = (convert.todouble(decimals) + add).tostring();      xstr = xstr.substring(0, xstr.indexof(".") + 1) + decimals;      x = convert.todouble(xstr, numberformatinfo.invariantinfo);       return x;  }

i'm wondering if there isn't simpler way without having convert number string first , adding decimal part of it. can see number added should 6 digit number ever decimal separator is.

if take remainder of object divided 1 you'll fractional portion of number:

double remainder = somedouble % 1;

to write whole method out, it's simple as:

public double calculate(double x, double add)  {     return math.floor(x) + (x + add) % 1; }

(this 1 of times you're glad % computes remainder, rather modulus. work negative numbers well.)


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