Declaration

double log(double dX);

Description

This function returns the log base e of the passed-in argument.

Overloads

float log(float);
double log(double);
long double log(long double);

Related Functions

float logf(float);
long double logl(long double);

* Note: Since C does not allow function overloading, these other versions of this function exist.

Domain (0, ∞) Range (-∞, ∞) Periodicity None Symmetry None Asymptotes x = 0

Example

#include <iostream>
#include <cmath>

int main() {
    using namespace std;

    double dX = 1000.0;
    cout << "x = " << dX << "  log(x) = " << log(dX) << endl;

    dX = 1.8;
    cout << "x = " << dX << "  log(x) = " << log(dX) << endl;

    return 0;
}

Output