NAME
    strerror - returns a string describing an error value

SYNOPSIS
    strerror([x])

TYPES
    x		error-value or integer in [0, 32767], defaults to errno()

    return	string

DESCRIPTION
    If x is the error-value with index n, strerror(x) and strerror(n)
    return one of:

		a system-generated message,
		a calc-generated description,
		a user-defined description created by newerror(str),
		the string "Error n",

    where, in the last form, n is represented decimally.

EXAMPLE
    System error messages may be different for different systems.
    > errmax(errcount()+3)
	    0
    > strerror(2)
 	"No such file or directory"

    > x = 3 * ("a" + "b")
    > print strerror(x)
    Bad arguments for +

    > a = newerror("alpha")
    > print strerror(a)
    alpha

    > print strerror(999)
    Error 999

    > a = 1/0
    > print strerror()
    Division by zero

LIMITS
    none

LIBRARY
    none

SEE ALSO
    errcount, errmax, error, iserror, errno, newerror, errorcodes