forcing output type

forcing output type

[Clint Adams]

Is there a way to get either

print $(( 2/3 ))

or

float f; (( f = 2/3 )); print $f

to output the equivalent of what would be output
if, for instance, the "2" were replaced by "2.0"?

Re: forcing output type

[Zefram]

Clint Adams wrote:
>float f; (( f = 2/3 )); print $f
>
>to output the equivalent of what would be output
>if, for instance, the "2" were replaced by "2.0"?

The expression "2/3" is a truncating integer division; its value is
exactly 0.  Just as in C, if you want to do a floating-point division
you have to provide floating-point operands.

-zefram

Re: forcing output type

[Clint Adams]

> The expression "2/3" is a truncating integer division; its value is
> exactly 0.  Just as in C, if you want to do a floating-point division
> you have to provide floating-point operands.

Here's a hack that lets one do "calc 2/3" and get a floating point
answer.

calc () {
        setopt localoptions extendedglob
        local expr="$*"
        if [[ "$expr" != *.* && "$expr" = *(#b)([0-9]##)(#B)' '#/' '#([0-9]##)* ]]
        then
                expr="${expr/${match[1]}/${match[1]}.0}" 
        fi
        print $(( $expr ))
}