Computing with Big Numbers

Fexl has built-in functions to handle signed integers of arbitrary size, also known as "big numbers" or simply "bn" values.

The functions include:

• bn_eq0
• bn_cmp
• bn_lt
• bn_le
• bn_eq
• bn_ne
• bn_ge
• bn_gt
• bn_from_dec
• bn_to_dec
• bn_add
• bn_sub
• bn_mul
• bn_div
• is_bn
• bn_mod
• bn_gcd

The b20.fxl file runs some tests, including the computation of 2^256, a 78 digit number:

115792089237316195423570985008687907853269984665640564039457584007913129639936

The reference output is here.

Other tests of big numbers include b48.fxl and partition.fxl .