converting double to binary in java

Question

I am generating sequence of numbers of type double like 0.9913963644564902 0.0341175990344773 0.13181105852355268 0.45773616980747556 and I have to convert it to binary representation in java.

What do you mean by "convert to binary"? What output are you expecting for this example? — Oliver Charlesworth, Dec 22 '13 at 13:57
You probably want to use a DataOutputStream. Read the javadoc. — JB Nizet, Dec 22 '13 at 13:59
The author most probably wants the actual floating point number in binary format (infinite precision). I do not think he wants to have all fields of the IEEE 8 byte double as a binary integer. — Tadas S, Dec 22 '13 at 14:07
@afk5min: But that's not something he/she can have, as most finite decimal expansions have infinite binary expansions. — Oliver Charlesworth, Dec 22 '13 at 14:13

score 2 · Accepted Answer · answered Dec 22 '13 at 14:02

2

This will help you. I have tried out using one of your input double value - 0.9913963644564902

 public static void main(String[] args){
        double d = 0.9913963644564902;
        System.out.println("0b"+Long.toBinaryString(Double.doubleToRawLongBits(d)));
    }

The output would be

run:
0b11111111101111101110011000010011011110010101101101100001110011
BUILD SUCCESSFUL (total time: 0 seconds)

answered Dec 22 '13 at 14:02

Keerthivasan

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Why would you think the author would want a binary INTEGER as a result? – Tadas S Dec 22 '13 at 14:09
1

Thanks it worked . will it also work for negative numbers – Kailash Dec 22 '13 at 14:10
Yes, for -0.9913963644564902, output would be *run: 0b1011111111101111101110011000010011011110010101101101100001110011 BUILD SUCCESSFUL (total time: 0 seconds)* – Keerthivasan Dec 22 '13 at 14:12
Do you need to map the sequence numbers and binary. go for Map – Keerthivasan Dec 22 '13 at 14:24
Yes, ofcourse you can! – Keerthivasan Dec 22 '13 at 14:30

converting double to binary in java

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