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Synopsis:
    #include <math.h>
    double log10( double x );

Description:
    The log10 function computes the logarithm (base 10) of x.  A domain
    error occurs if the argument is negative.  A range error occurs if the
    argument is zero.

Returns:
    The log10 function returns the logarithm (base 10) of the argument.
     When the argument is outside the permissible range, the  matherr
    function is called.  Unless the default  matherr function is replaced,
    it will set the global variable  errno to  EDOM, and print a "DOMAIN
    error" diagnostic message using the  stderr stream.

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

    void main()
      {
        printf( "%f\n", log10(.5) );
      }

    produces the following:

    -0.301030

Classification:
    ANSI

Systems:
    Math

See Also:
    exp, log, log2, pow, matherr