Simple Question on float's string representation

[Prabhat Gupta]

Hi All,

I am trying to get literal value of a float variable in decimal form .not in scientific notation.What should be approach?

   public static void main(String[] args) {
     
        
        float f=123456789.123f;
        String strValue=String.valueOf(f);        
        System.out.println(strValue);
       
       
   
      }  

Here output is 1.23456792E8 but i wish it should be 123456789.123 .

Thanks in advance.

-Prabhat

[Wouter Oet]

java.text.NumberFormat is what your looking for

[Prabhat Gupta]

Thanks Wouter,
I tried what suggested by you .But it works for double type only not for float type.

public static void main(String[] args) {
  float number1=12345678912223.123f;
  double number2=12345678912223.123; 
  
  DecimalFormat decimalFormat=new DecimalFormat();
  decimalFormat.setGroupingUsed(false); 
  String res=decimalFormat.format(number1);
  System.out.println(number1);
  System.out.println(res); 
  

  res=decimalFormat.format(number2);
  System.out.println("\n"+number2);
  System.out.println(res);
  
  number2=(double)number1;
  res=decimalFormat.format(number2);
  System.out.println("\n"+number2);
  System.out.println(res);
  }    

Output :
1.2345679E13
12345679020032

1.2345678912223123E13
12345678912223.123

1.2345679020032E13
12345679020032


Even if i try to convert first float to double then format obtained double value ,the result is same as formatting of float number.

Any other suggestions are welcomed

--Prabhat

[Roel De Nijs]

Hi Prabhat,

Seems to me that floats and formatting behave very strange.

	public static void main(String[] args) {
		float[] floats = { 123456.123f, 1234567.123f, 12345678.123f };
		double[] doubles = { 123456.123, 1234567.123, 12345678.123 };

		NumberFormat nf = NumberFormat.getNumberInstance();
		nf.setGroupingUsed(false);
		for (int i = 0; i < floats.length; i++) {
			System.out.println("float: " + floats[i] + " - " + nf.format(floats[i]));
			System.out.println("double: " + doubles[i] + " - " + nf.format(doubles[i]));
			System.out.println();
		}
	}

Which outputs (on my pc):

float: 123456.125 - 123456,125
double: 123456.123 - 123456,123

float: 1234567.1 - 1234567,125
double: 1234567.123 - 1234567,123

float: 1.2345678E7 - 12345678
double: 1.2345678123E7 - 12345678,123

I don't have an explanation for that behavior.

Kind regards,
Roel