error: "v" is not a valid variable/function/unit. error: "r" is not a valid variable/function/unit. error: "on" is not a valid variable/function/unit. -(-(0 * e * (0 * second) * i)) = 0 s

usage: qalc [options] [expression] where options are: -b, -base BASE set the result number base -e, -exrates update exchange rates -f, -file FILE executes commands from a file first -i, -interactive start in interactive mode -l, -list displays a list of all user-defined variables, functions and units. --list-functions displays a list of all functions. --list-units displays a list of all units. --list-variables displays a list of all variables. -n, -nodefs do not load any functions, units, or variables from file -nocurrencies do not load any global currencies from file -nodatasets do not load any global data sets from file -nofunctions do not load any global functions from file -nounits do not load any global units from file -novariables do not load any global variables from file -t, -terse reduces output to just the result of the input expression -s, -set "OPTION VALUE" as set command in interactive program session (ex. -set "base 16") -/+u8 turn on/off unicode support The program will start in interactive mode if no expression and no file is specified (or interactive mode is explicitly selected).