log

Find the logarithm of argument x with the base of a

log<return_type>(a, x);

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

log<int>(20, 400); //2
log<float>(1.43, 543.18); //17.6066

Just like ln(x), log(a, x) isn't defined for all non-positive arguments x, as the compiler will throw an exception:

Error: Logarithm is undefined for non-positive values.

Because the ln(x) function is so precise, we can just use the:

$$log_a(x) = \frac{ln(x)}{ln(a)}$$

formula to calculate the given logarithm.