using System;
namespace Example.Utils
{
public interface ICalculator
{
double Add(double a, double b);
double Subtract(double a, double b);
double Multiply(double a, double b);
double Divide(double a, double b);
}
public class BasicCalculator : ICalculator
{
public double Add(double a, double b)
{
return a + b;
}
public double Subtract(double a, double b)
{
return a - b;
}
public double Multiply(double a, double b)
{
return a * b;
}
public double Divide(double a, double b)
{
if (Math.Abs(b) < double.Epsilon)
throw new DivideByZeroException("Division by zero");
return a / b;
}
}
public static class MathUtils
{
public static long Factorial(int n)
{
if (n < 0) throw new ArgumentException("Factorial is not defined for negative numbers");
if (n <= 1) return 1;
return n * Factorial(n - 1);
}
public static bool IsPrime(int n)
{
if (n < 2) return false;
for (int i = 2; i <= Math.Sqrt(n); i++)
{
if (n % i == 0) return false;
}
return true;
}
public static int Fibonacci(int n)
{
if (n < 0) throw new ArgumentException("Fibonacci is not defined for negative numbers");
if (n == 0) return 0;
if (n == 1) return 1;
return Fibonacci(n - 1) + Fibonacci(n - 2);
}
public static T Max<T>(T a, T b) where T : IComparable<T>
{
return a.CompareTo(b) >= 0 ? a : b;
}
public static T Min<T>(T a, T b) where T : IComparable<T>
{
return a.CompareTo(b) <= 0 ? a : b;
}
public static int Gcd(int a, int b)
{
return b == 0 ? Math.Abs(a) : Gcd(b, a % b);
}
public static int Lcm(int a, int b)
{
return Math.Abs(a * b) / Gcd(a, b);
}
}
public class Program
{
public static void Main(string[] args)
{
var calc = new BasicCalculator();
Console.WriteLine($"5 + 3 = {calc.Add(5.0, 3.0)}");
Console.WriteLine($"10! = {MathUtils.Factorial(10)}");
Console.WriteLine($"Fibonacci 8 = {MathUtils.Fibonacci(8)}");
Console.WriteLine($"Is 17 prime? {MathUtils.IsPrime(17)}");
Console.WriteLine($"GCD(24, 16) = {MathUtils.Gcd(24, 16)}");
}
}
}
