in Java, how to delete all 0s in float?

java floating-point zero
clerksx picture clerksx · Dec 1, 2011 · Viewed 15.8k times · Source

I'd like to change float like this way:

10.5000 -> 10.5 10.0000 -> 10

How can I delete all zeros after the decimal point, and change it either float (if there's non-zeros) or int (if there were only zeros)?

Thanks in advance.

Answer

maerics picture maerics · Dec 1, 2011

Well the trick is that floats and doubles themselves don't really have trailing zeros per se; it's just the way they are printed (or initialized as literals) that might show them. Consider these examples:

Float.toString(10.5000); // => "10.5"
Float.toString(10.0000); // => "10.0"

You can use a DecimalFormat to fix the example of "10.0":

new java.text.DecimalFormat("#").format(10.0); // => "10"

Related questions

How do I check if a zero is positive or negative?

Is it possible to check if a float is a positive zero (0.0) or a negative zero (-0.0)? I've converted the float to a String and checked if the first char is a '-', but are there any other ways?

Read More
How to convert float to int with Java

I used the following line to convert float to int, but it's not as accurate as I'd like: float a=8.61f; int b; b=(int)a; The result is : 8 (It should be 9) When a = -7.65f, the result is : -7 (…

Read More
How to nicely format floating numbers to String without unnecessary decimal 0?

An 64-bit double can represent integer +/- 253 exactly Given this fact I choose to use a double type as a single type for all my types, since my largest integer is unsigned 32-bit. But now I have to print these …

Read More