the distance from a point to a line

This should do it though there's no error checking (if input is invalid 0 is substituted):

using System;

class Program

{

static void Main()

{

double A, B, C, x, y, dist;

Console.Write("Enter A : ");

double.TryParse(Console.ReadLine(), out A);

Console.Write("Enter B : ");

double.TryParse(Console.ReadLine(), out B);

Console.Write("Enter C: ");

double.TryParse(Console.ReadLine(), out C);

Console.Write("Enter x : ");

double.TryParse(Console.ReadLine(), out x);

Console.Write("Enter y : ");

double.TryParse(Console.ReadLine(), out y);

dist = distance(A, B, C, x, y);

Console.WriteLine("The distance between them is {0}", dist);

Console.ReadKey();

}

static double distance(double A, double B, double C, double x, double y)

{

double num = Math.Abs(A * x + B * y + C);

double denom = Math.Sqrt(A * A + B * B);

return num/denom;

}

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