using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "a", "H", "over", "Jack"};

        string name = presidents.Last();
        Console.WriteLine(name);
    }
}

    

   
 


using System;
delegate int NumericSequence();

class Test {
    static void Main() {
        int seed = 0;
        NumericSequence natural = () => seed++;
        Console.WriteLine(natural());
        Console.WriteLine(natural());
    }
}

    

   
 

using System;

class Test {
    static void Main() {
        Func<int, int> square = x => x * x;
        Console.WriteLine(square(3));     // 9
    }
}

    

   
 

using System;
delegate int Transformer(int i);

class Test {
    static void Main() {
        Transformer square = x => x * x;
        Console.WriteLine(square(3));    // 9
    }
}

    

   
 

using System;
delegate int NumericSequence();

class Test {
    static NumericSequence Natural() {
        return () => { int seed = 0; return seed++; };
    }

    static void Main() {
        NumericSequence natural = Natural();
        Console.WriteLine(natural());
        Console.WriteLine(natural());
    }
}

    

   
 
using System;
delegate int NumericSequence();

class Test {
    static NumericSequence Natural() {
        int seed = 0;
        return () => seed++;

    }

    static void Main() {
        NumericSequence natural = Natural();
        Console.WriteLine(natural());
        Console.WriteLine(natural());
    }
}

    

using System;
using System.Linq;
using System.Linq.Expressions;

class Program {
static void Main(string[] args) {
Expression> isOddExpression = i => (i & 1) == 1;
ParameterExpression param = Expression.Parameter(typeof(int), “i”);
Expression> isOdd =
Expression.Lambda>(
Expression.Equal(
Expression.And(
param,
Expression.Constant(1, typeof(int))),
Expression.Constant(1, typeof(int))),
new ParameterExpression[] { param });

Func isOddCompiledExpression = isOddExpression.Compile();
for (int i = 0; i < 10; i++) { if (isOddCompiledExpression(i)) Console.WriteLine(i + " is odd"); else Console.WriteLine(i + " is even"); } } } [/csharp]