The log1pf
function is a C library function that returns the natural logarithm of the sum of one and the argument. For example, if the argument provided is x,
the function calculates the natural logarithm of (1 + x)
, as shown below:
To use the log1pf
function, we need to include the math.h
header file, as shown below:
#include <math.h>
The log1pf
function in C produces more accurate results than computing log(x + 1)
separately.
The log1pf
function takes a single argument and returns a single value. It is declared as follows:
The log1pf
function takes a single argument of the float
type.
The log1pf
function returns a single value of the float
type:
If x
is less than -1, a domain error occurs.
If x
is equal to -1, a range error may occur.
If x
is equal to 0, the return value will be 0.
Hence, arguments with values greater than -1 will produce correct results, i.e., the natural logarithm (1+x).
The code below shows the use of the log1pf
function in C:
#include <stdio.h>#include <math.h>int main() {//Declare xfloat x = 0.80;//Call the functionfloat ans = log1pf (x);//Display resultprintf ("The natural log of (x+1) is: %f\n", ans);return 0;}