c# prac5 var 18

// 1
using System;

public class Program
{

    static double f(double x1, double y1, double x2, double y2)
    {
        return Math.Sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
    }

    static double min(double a, double b)
    {
        return a > b ? b : a;
    }

    public static void Main()
    {
        Console.Write("Minimal distance between 3 points\nEnter first point:\nx = ");
        double x1, x2, x3, y1, y2, y3;
        x1 = double.Parse(Console.ReadLine());
        Console.Write("y = ");
        y1 = double.Parse(Console.ReadLine());
        Console.Write("Enter second point:\nx = ");
        x2 = double.Parse(Console.ReadLine());
        Console.Write("y = ");
        y2 = double.Parse(Console.ReadLine());
        Console.Write("Enter third point:\nx = ");
        x3 = double.Parse(Console.ReadLine());
        Console.Write("y = ");
        y3 = double.Parse(Console.ReadLine());
        double d1, d2, d3, d;
        d1 = f(x1, y1, x2, y2);
        d2 = f(x1, y1, x3, y3);
        d3 = f(x3, y3, x2, y2);
        d = min(d1, d2);
        d = min(d, d3);
        Console.Write("\nMinimal distance between ");
        if(d == d1)
            Console.Write("first and second");
        else if(d == d2)
            Console.Write("first and third");
        else
            Console.Write("second and third");
        Console.Write(" point and it is {0:.###}", d);
    }
}


// 2 & 3
using System;

public class Program
{

    static double f(double x)
    {
        double y;
        if(x < 3)
            y = x*x - 0.3;
        else if(x > 5)
            y = x*x + 1;
        else
            y = 0;
        return y;
    }

    static double f(double x, out double y)
    {
        if(x < 3)
            y = x*x - 0.3;
        else if(x > 5)
            y = x*x + 1;
        else
            y = 0;
        return 0;
    }

    public static void Main()
    {
        Console.Write("table of f(x) where a <= x <= b by step h\nEnter a = ");
        double a, b, h, i;
        a = double.Parse(Console.ReadLine());
        Console.Write("Enter b = ");
        b = double.Parse(Console.ReadLine());
        Console.Write("Enter h = ");
        h = double.Parse(Console.ReadLine());
        Console.Write("Now table:\n");
        for(i = a; i <= b; i += h)
        {
            Console.Write("F({0}) = {1}\n", i, f(i));
        }
        Console.Write("\nTable overloaded:\n");
        for(i = a; i <= b; i += h)
        {
            double y;
            f(i, out y);
            Console.Write("F({0}) = {1}\n", i, y);
        }
    }
}