How return only two decimals with float?

Question

I've got a float value and i need to have only two decimals after comma. I'm using this code:

public static float getWhatINeed() {
  StatFs statFs = new StatFs(Environment.getDataDirectory().getAbsolutePath());
  float total = 
      ((float)statFs.getBlockCount() * statFs.getBlockSize()) / (1073741824);
  return total;
}

And it returns for example: 12.552425 in a textview. I need display something like: 12.55 that is enough for me. I saw this:

String s = String.format("%.2f", 1.2975118);

somewhere but I can't use it in my case because I use a float value and I need to use float. How could I solve this?

Seems duplilcate of http://stackoverflow.com/questions/8911356/whats-the-best-practice-to-round-a-float-to-2-decimals — Pankaj Kumar, Nov 25 '13 at 10:55
Here [What's the best practice to round a float to 2 decimals?](http://stackoverflow.com/questions/8911356/whats-the-best-practice-to-round-a-float-to-2-decimals). — Simon Dorociak, Nov 25 '13 at 10:56

score 1 · Answer 1 · answered Nov 25 '13 at 10:55

There is no mechanism to limit the number of decimal points in a float. A float is a float and it has an "unlimited" number of decimals. The String display of a float may be limited to a format only showing a specific number of decimals.

If you really NEED 2 decimals, use BigDecimal

You basically have 4 options:

return a float and deal with the fact that there are n decimal places
format to a String (which means a lot of string parsing if you need to do calculation)
convert to use BigDecimal
convert to use int and assume that the ones digit represents hundredths.

score 0 · Answer 2 · answered Nov 25 '13 at 10:54

0

Did you try:

new DecimalFormat("00.00").format(1.2975118);

answered Nov 25 '13 at 10:54

Nermeen

15,883
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score 0 · Answer 3 · answered Nov 25 '13 at 10:59

0

You can try as follows

 DecimalFormat df = new DecimalFormat("0.##");
    float a=1.256f;
    System.out.println(df.format(a));
}

Out put

1.26

answered Nov 25 '13 at 10:59

Ruchira Gayan Ranaweera

34,993
17
75
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score -3 · Answer 4 · answered Nov 25 '13 at 10:55

-3

After setting precision and get as a String You can canvert it back to float by

float f = Float.parseFloat(YourString);

answered Nov 25 '13 at 10:55

Viswanath Lekshmanan

9,945
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This will not work as it could result in a float equivelant to "1.120000000000000000001". This is why "This data type should never be used for precise values, such as currency" – John B Nov 25 '13 at 10:59

How return only two decimals with float?

4 Answers4