log() Function in C++

The std::log() in C++ is a built-in function that is used to calculate the natural logarithm (base e) of a given number. The number can be of any data type i.e. int, double, float, long long. It is defined inside the <cmath> header file.

2.3979
-0.693147
0
-inf
inf
nan

Syntax

std::log(n);

Parameters

• n: Value whose natural logarithm is to be found.

Return Value

• Returns the natural log (base e) of the value