C library function - log10()

Description

The C library function double log10(double x) returns the common logarithm (base-10 logarithm) of x.

Declaration

Following is the declaration for log10() function.

double log10(double x)

Parameters

• x -- This is the floating point value.

Return Value

This function returns the common logarithm of x, for values of x greater than zero.

Example

The following example shows the usage of log10() function.

#include <stdio.h>
#include <math.h>

int main ()
{
   double x, ret;
   x = 10000;
  
   /* finding value of log1010000 */
   ret = log10(x);
   printf("log10(%lf) = %lf\n", x, ret);
   
   return(0);
}

Let us compile and run the above program, this will produce the following result:

log10(10000.000000) = 4.000000