How do I convert a String to a BigInteger?
Using the constructor BigInteger(String val) Translates the decimal String representation of a BigInteger into a BigInteger. Javadoc
biginteger
A good and basic implementation of BigInt class in C++
Here’s one. I haven’t used it, but it doesn’t look too complex, and it was the first result when I googled “bigint c++”.
Converting from Integer, to BigInteger
The method you want is BigInteger#valueOf(long val). E.g., Making a String first is unnecessary and undesired.
Unsigned long in Java
Currently, I am using signed values, -2^63 to 2^63-1. Now I need the same range (2 * 2^64), but with positive values only. I found the java documentations mentioning unsigned long, which suits this use. I tried to declare 2^64 to a Long wrapper object, but it still loses the data, in other words, it … Read more