Check whether a float number contains decimals or not

Question

How can I check whether a float number contains decimals like 2.10, 2.45, 12382.66 and not 2.00 , 12382.00. I want to know if the number is \"round\" or not. How can I do th

Answer 1

import java.lang.Math;
public class Main {
    public static void main(String arg[]){
        convert(50.0f);
        convert(13.59f);

    }

    private static void convert(float mFloat){
        if(mFloat - (int)mFloat != 0)
            System.out.println(mFloat);
        else
            System.out.println((int)mFloat);
    }
}

Answer 2

In Scala you can use isWhole() or isValidInt() to check if number has no fractional part:

object Example {
  def main(args: Array[String]) = {

    val hasDecimals = 3.14.isWhole //false
    val hasDecimals = 3.14.isValidInt//false

  }
}

Answer 3

If you care only about two decimals, get the remainder by computing bool hasDecimals = (((int)(round(x*100))) % 100) != 0;

In generic case get a fractional part as described in this topic and compare it to 0.

Answer 4

Using modulus will work:

if(num % 1 != 0) do something!
// eg. 23.5 % 1 = 0.5

Answer 5

You could do this:

  float num = 23.345f;
  int intpart = (int)num;
  float decpart = num - intpart;
  if(decpart == 0.0f)
  {
    //Contains no decimals
  }
  else
  {
     //Number contains decimals
  }

Answer 6

I use this c function for objective c

BOOL CGFloatHasDecimals(float f) {
    return (f-(int)f != 0);
}