java: how can I convert double precision numbers to decimal

Question

I want to convert double precision numbers to decimal .

for example I have 23.43, the double value would be (using matlab) : 174 71 255 122 20 110 55 64 now having this how can I write a java program that gives me 23.43 ?

and here is the calculation of double precision in matlab :

MATLAB constructs the double data type according to IEEE Standard 754 for double precision. Any value stored as a double requires 64 bits, formatted as shown in the table below:

Bits Usage

63 Sign (0 = positive, 1 = negative)

62 to 52 Exponent, biased by 1023

51 to 0 Fraction f of the number 1.f

In what bizarro way are you converting 23.43 that it gives you that monstrosity? :-) — paxdiablo, May 24 '12 at 08:07
@melisazand I think that the problem is how are you getting "that" in matlab rather that a simple 23.43. You should try to fix the output in matlab, not in java. — Pablo, May 24 '12 at 08:14
actually it's not possible . I want to send data from matlab and use that in my app . I should use double other wise the data would not send completely . and the problem with double is that matlab convert it to this strange format ! — melisa zand, May 24 '12 at 08:16

score 5 · Accepted Answer · edited May 24 '12 at 08:19

5

long l = Double.doubleToLongBits(double);
double d = Double.longBitsToDouble(long);

edited May 24 '12 at 08:19

Buhake Sindi

87,898
29
167
228

answered May 24 '12 at 08:10

Liu guanghua

981
1
9
18

Looks like what you have is a byte array. You'll need to convert your numbers to a long first to use this answer, it shouldn't be complicated. – Haozhun May 24 '12 at 08:12
I tried to convert -22 now I recieve 4.668931E18 , first i convert byte to long and then double to long but what is this number ? – melisa zand Jun 01 '12 at 10:37

java: how can I convert double precision numbers to decimal

1 Answers1