Rudy Velthuis is the orignal author of this library. He unfortunately passed away a while back. In an effort to keep this valuable library alive we've done the following:

Pulled changes from all the other branches into this repository
Created Wiki articles based on his original documentation (with some updates)
Opened up for issues
Fixed some other issues and updated for Delphi 11.3

BigInteger
BigInteger is a multi-precision integer. Its size is only limited by available memory.

BigInteger is built for ease of use, speed and reliability. It is written in plain Object Pascal and x86-32/x86-64 assembler, but every assembler function has a so called "pure Pascal" equivalent as well. It is modelled after the BigInteger type in .NET, but is far more optimized than that and provides an interface that is more in line with Delphi. It uses higher level algorithms like Burnikel-Ziegler, Karatsuba, Toom-Cook, etc. to make things fast even for very large integers. It offers overloaded operators and all the usual functions. More information can be found on the BigIntegers unit wiki page.

BigDecimal
BigDecimal is a multi-precision decimal floating point type. It can have an almost unlimited precision.

BigDecimal is equally built for ease of use and reliability. It builds on top of BigInteger: the internal representation is a BigInteger for the significant digits, and a scale to indicate the decimals. It also offers overloaded operators and all the usual functions. This is modelled after the BigDecimal type in Java, but the interface is more in line with Delphi. More information about this type can be found on the BigDecimals unit wiki page.

BigRational
A type that holds a number as fraction (ratio) of two BigIntegers, a numerator and a denominator, i.e. 1/7 or 100/3. This type is very good at simple arithmetic (+, -, *, /), since it doesn't lose precision or need any rounding. Still a work in progress...

Only for V.I.P