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how to convert a binary to a decimal?

Posted on 2014-01-07
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Last Modified: 2014-01-09
Given one string consisting of numbers which actually corresponds to a real big binary number(>0), how to convert it to a decimal string in java. For example,

"10010001000111110110110100010100001001100100101001010001100000011101111110011101000101101111101001101101111100110001100011001001101001" in binary =
"12345678910111213141516171819202122232425" in decimal
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Question by:jl66
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by:jl66
ID: 39763488
Revised title.
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dpearson earned 2000 total points
ID: 39764271
Check out the BigInteger class:
http://docs.oracle.com/javase/6/docs/api/java/math/BigInteger.html

One of the constructors takes a string and a "radix" which is the fancy term for base, so for binary this is 2:

            BigInteger bi = new BigInteger("100101000111111110000", 2);
                bi.toString() ; // Print it in Decimal

Hope that helps,

Doug
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Author Comment

by:jl66
ID: 39764277
If we restrict the binary number to be <=2^128, is it a bit easy to resolve it?
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by:dpearson
dpearson earned 2000 total points
ID: 39764289
BigInteger handles arbitrary sized numbers.  So you should be fine with any sized binary.
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Author Closing Comment

by:jl66
ID: 39769674
Thanks a lot. Very helpful.
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