#!/usr/bin/env zsh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH

# though technically compatible with other shells,
# extra functionality is through zsh's extended arithmetic functions.

arith() { ### @-
    ### perform arithmetic using the shell and display the result.
    ### see also [`hex`](#hex) and [`bin`](#bin).
    ### this example requires zsh:
    ###
    ### ```
    ### % db=6
    ### % noglob arith 10**(db/20.)
    ### 1.9952623149688795
    ### ```
#   <<<"$(($@))"
    printf "%s\n" "$(($@))"
}

[ -n "${preload+-}" ] || arith "$@"