ln

Find the natural logarithm of x

ln<return_type>(x);

will return the natural logarithm of x, given as the argument. The return_type specifies in which data type the result will be returned in, like shown in below example:

ln<int>(123); //2
ln<float>(371283123789); //26.6402
ln<bool>(7); //1

Natural logarithm f(x) = ln(x) isn't defined for non-positive numbers, so the compiler will throw an exception:

Error: The natural logarithm is undefined for non-positive values.

The function works so that it can also handle big integers/numbers aswell. How it works, as we first take the scientific notation of the number, calculate the value using the very fast converging expansion and then multiplying the value by n - 1 times of log10. You can find an in depth explanation of this approach here: https://math.stackexchange.com/questions/977586/is-there-an-approximation-to-the-natural-log-function-at-large-values.