A method of using logarithmic functions in C language _c language

C Language Log () function: Returns an e-base pair value
header file:

#include <math.h>

The log () function returns an e-base numeric value, which is a prototype:

 Double log (double x);

Log () is used to calculate the pair value of x with an E, and then returns the result. Set the return value to RET, the

x = Eret

If x is negative or 0, an error occurs and the errno value is set. Error code:
EDOM: parameter x is negative;
Erange: Parameter x is zero value, 0 is undefined for value.

Note: Please join-LM when compiling with GCC.

"Instance" to find the logarithm of 5.5.

#include <stdio.h>
#include <math.h>
int main ()
{
 double param, result;
 param = 5.5;
 result = log (param);
 printf ("log (%f) =%f\n", param, result);
 return 0;
}

Output results:

Log (5.500000) = 1.704748

C language log10 () function: Returns a value of 10
header file:

#include <math.h>

LOG10 () returns a 10-based numeric value, which is a prototype:

 Double log10 (double x);

LOG10 () is used to calculate the pair value of a 10-based x, and then returns the result. Set the return value to RET, the

x = 10ret

Return value: Returns the numeric value of the argument x with a 10 base.

If x is negative or 0, an error occurs and the errno value is set. Error code:
EDOM: parameter x is negative;
Erange: Parameter x is zero value, 0 is undefined for value.

Note: Please join-LM when compiling with GCC.

Instance

#include <math.h>
Main () {
 double answer;
 Answer = log10 (MB);
 printf ("log10" =%f\n ", answer);
}

Output results:

LOG10 (100) = 2.000000