Fraction Math in C#

Fraction

Math in C#

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

Current Solution

if (
    args is not [var leftRaw, var op, var rightRaw]
    || !Fraction.TryParse(leftRaw, out var a)
    || !Fraction.TryParse(rightRaw, out var b)
)
{
    Console.Error.WriteLine("Usage: ./fraction-math operand1 operator operand2");
    return;
}

Console.WriteLine(
    op switch
    {
        "+" => (a + b).ToString(),
        "-" => (a - b).ToString(),
        "*" => (a * b).ToString(),
        "/" => (a / b).ToString(),
        "==" => (a == b ? 1 : 0),
        "!=" => (a != b ? 1 : 0),
        ">" => (a > b ? 1 : 0),
        "<" => (a < b ? 1 : 0),
        ">=" => (a >= b ? 1 : 0),
        "<=" => (a <= b ? 1 : 0),
        _ => "Error: Invalid operator",
    }
);

public readonly record struct Fraction(long N, long D) : IComparable<Fraction>
{
    public override string ToString() => $"{N}/{D}";

    public static Fraction Create(long n, long d)
    {
        if (d == 0)
            throw new DivideByZeroException();

        long g = Gcd(n, d);
        return new(n / g * Math.Sign(d), Math.Abs(d / g));
    }

    static long Gcd(long a, long b)
    {
        a = Math.Abs(a);
        b = Math.Abs(b);

        while (b != 0)
            (a, b) = (b, a % b);

        return a == 0 ? 1 : a;
    }

    public static bool TryParse(ReadOnlySpan<char> s, out Fraction f)
    {
        f = default;

        int i = s.IndexOf('/');
        return i >= 0
            && long.TryParse(s[..i], out long n)
            && long.TryParse(s[(i + 1)..], out long d)
            && d != 0
            && (f = Create(n, d)) == f;
    }

    public static Fraction operator +(Fraction a, Fraction b) =>
        Create(a.N * b.D + b.N * a.D, a.D * b.D);

    public static Fraction operator -(Fraction a, Fraction b) =>
        Create(a.N * b.D - b.N * a.D, a.D * b.D);

    public static Fraction operator *(Fraction a, Fraction b) => Create(a.N * b.N, a.D * b.D);

    public static Fraction operator /(Fraction a, Fraction b) => Create(a.N * b.D, a.D * b.N);

    public static bool operator <(Fraction a, Fraction b) => a.N * b.D < b.N * a.D;

    public static bool operator >=(Fraction a, Fraction b) => !(a < b);

    public static bool operator >(Fraction a, Fraction b) => b < a;

    public static bool operator <=(Fraction a, Fraction b) => !(b < a);

    public int CompareTo(Fraction other) => (N * other.D).CompareTo(other.N * D);
}

Fraction Math in C# was written by:

• Alexander Ruban
• Ștefan-Iulian Alecu

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.