What is log10l in C?
The log10l() function takes an argument of type double as input and returns the base-10 logarithm of . log10l() in C is defined in the <math.h> header file. The returned value is equivalent to the following in mathematical notation:
The function is defined in the C++ <math.h> header file as:
long double log10l(double x);
Below is an example of how to use the log10l() function, as well as a comparison of log10l() and log10():
#include <stdio.h>#include <math.h>int main() {long double result = log10l(3.0);double result1 = log10(3.0);printf("Result of log10l(3.0): %f\n", result);printf("Result of log10(3.0): %f\n", result1);return 0;}
The difference between functions log10 and log10l is that log10 simply has a return type of double compared to the return type of log10l, which is long double.
Below are the ways in which the results of the log10l function vary in different ranges of parameter x:
-
If
xis less than 0, the results are not a number (NAN) -
If
xis greater than 0, the results are legitimate -
If
xis equal to 0, the result is -
#include <stdio.h>#include <math.h>#include <iostream>using namespace std;int main() {//long double result = log10l(0.0);long double result1 = log10(0.0);long double result2 = log10(-3.0);long double result3 = log10(3.0);cout<<"for x < 0: "<< result2<<endl;cout<<"for x > 0: "<< result3<<endl;cout<<"for x = 0: "<< result1<<endl;return 0;}
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