NAME
    isstr - whether a value is a string

SYNOPSIS
    isstr(x)

TYPES
    x		any, &any

    return	int

DESCRIPTION
    Determine if x is a string.  This function will return 1 if x is
    a string, 0 otherwise.

EXAMPLE
    > print isstr("1"), isstr(1), isstr("")
    1 0 1

LIMITS
    none

LIBRARY
    none

SEE ALSO
    isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
    ishash, isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
    isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
    issimple, issq, istype