Fraction Math in Powershell

Welcome to the Fraction Math in Powershell page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

function Show-Usage() {
    Write-Host "Usage: ./fraction-math operand1 operator operand2"
    Exit 1
}

class Fraction : IComparable {
    [int]$Num
    [int]$Den

    Fraction([int]$n, [int]$d) {
        if ($d -lt 0) {
            $n = -$n
            $d = -$d
        }

        $g = [Fraction]::Gcd($n, $d)
        $this.Num = [Math]::Floor($n / $g)
        $this.Den = [Math]::Floor($d / $g)
    }

    static [int] Gcd([int]$a, [int]$b) {
        if (-not $a) {
            return $b
        }

        while ($b) {
            $a, $b = $b, ($a % $b)
        }

        return $a
    }

    static [Fraction] Parse([string]$str) {
        $parts = $str.Split('/')
        $d = 1
        $n = [int]::Parse($parts[0])
        if ($parts.Length -eq 2) {
            $d = [int]::Parse($parts[1])
        } elseif ($parts.Length -gt 2) {
            throw "Invalid format"
        }

        return [Fraction]::new($n, $d)
    }

    [string] ToString() {
        return "$($this.Num)/$($this.Den)"
    }

    [bool] Equals([object]$other) {
        return $this.Num -eq $other.Num -and $this.Den -eq $other.Den
    }

    # n1/d1 OP n2/d2 = n1*d2 OP n2*d1
    [int] CompareTo([object]$other) {
        return $this.Num * $other.Den - $other.Num * $this.Den
    }

    # n1/d1 +/- n2/d2 = (n1*d2 +/- n2*d1) / (d1*d2)
    static [Fraction] op_Addition([Fraction]$lhs, [Fraction]$rhs) {
        return [Fraction]::new($lhs.Num * $rhs.Den + $rhs.Num * $lhs.Den, $lhs.Den * $rhs.Den)
    }

    static [Fraction] op_Subtraction([Fraction]$lhs, [Fraction]$rhs) {
        return [Fraction]::new($lhs.Num * $rhs.Den - $rhs.Num * $lhs.Den, $lhs.Den * $rhs.Den)
    }

    # n1/d1 * n2/d2 = (n1*n2) / (d1*d2)
    static [Fraction] op_Multiply([Fraction]$lhs, [Fraction]$rhs) {
        return [Fraction]::new($lhs.Num * $rhs.Num, $lhs.Den * $rhs.Den)
    }

    # (n1/d1) / (n2/d2) = (n1*d2) / (n2*d1)
    static [Fraction] op_Division([Fraction]$lhs, [Fraction]$rhs) {
        return [Fraction]::new($lhs.Num * $rhs.Den, $rhs.Num * $lhs.Den)
    }
}

function Invoke-FractionMath([Fraction]$frac1, [string]$op, [Fraction]$frac2) {
    switch ($op) {
        "+" { return $frac1 + $frac2 }
        "-" { return $frac1 - $frac2 }
        "*" { return $frac1 * $frac2 }
        "/" { return $frac1 / $frac2 }
        "==" { return $frac1 -eq $frac2 }
        "!=" { return $frac1 -ne $frac2 }
        ">" { return $frac1 -gt $frac2 }
        ">=" { return $frac1 -ge $frac2 }
        "<" { return $frac1 -lt $frac2 }
        "<=" { return $frac1 -le $frac2 }
        default { throw "Invalid operation" }
    }
}

if ($args.Length -lt 3) {
    Show-Usage
}

try {
    $frac1 = [Fraction]::Parse($args[0])
    $frac2 = [Fraction]::Parse($args[2])
} catch {
    Show-Usage
}

$op = $args[1]
$result = Invoke-FractionMath $frac1 $op $frac2
if ($result -is [bool]) {
    Write-Output ([int]$result)
} else {
    Write-Output "$result"
}

Fraction Math in Powershell was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.