The two main things in the job below (details taken from StackOverflow) are "_real", which is the value you want to convert, and "_accuracy", which specifies the max relative error; not the max absolute error.

So _accuracy = 0.01 would find a fraction within 1% of the value.

I also quickly threw this job together, so I didn't test for extremely large integers or any edge cases.

Here's a simple job that demonstrates how it works.

static void KW_DecToFrac(Args _args) { // Create a function that accepts these two parameters real _real = 0.45; real _accuracy = 0.01; int sign = _real < 0 ? -1 : (_real == 0 ? 0 : 1); real maxError; System.Decimal d; int n; int lower_n = 0; int lower_d = 1; int middle_n; int middle_d; int upper_n = 1; int upper_d = 1; int z; void f(int _N, int _D) { info(strFmt("%1/%2", _N, _D)); } _real = abs(_real); maxError = sign == 0 ? _accuracy : _real * _accuracy; d = System.Math::Floor(_real); n = System.Decimal::ToInt32(d); _real -= n; if (_real < maxError) { f(sign * n, 1); return; } if (1 - maxError < _real) { f(sign * (n+1), 1); return; } while (true) { z++; middle_n = lower_n + upper_n; middle_d = lower_d + upper_d; if (middle_d * (_real + maxError) < middle_n) { upper_n = middle_n; upper_d = middle_d; } else if (middle_n < (_real - maxError) * middle_d) { lower_n = middle_n; lower_d = middle_d; } else { f((n * middle_d + middle_n) * sign, middle_d); return; } } info("Done"); }