using System;

string borderLine = "______________________________________________" + "\n";

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//Simple Function & Returns Value//

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int multiplySumAndDifference(int a, int b, int c, int d)

{

return (a + b) * (c - d);

}

​

Console.WriteLine( multiplySumAndDifference(1, 2, 3, 4) );

Console.WriteLine( multiplySumAndDifference(6, 0, 4, 7) );

Console.WriteLine( multiplySumAndDifference(3, 1, 7, 2) );

​

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Console.WriteLine(borderLine);

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//Void Function And Prints One Output//

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void oldEnoughToVoteOrDrink()

{

    Console.WriteLine("What is your name?");

        string name = Console.ReadLine();

    Console.WriteLine("What is your age?");

        int age = int.Parse(Console.ReadLine());

    if (age < 18)                    { Console.WriteLine("\n" + "My name is " + name + " and I am too young to vote or drink."); }

    else if (age >= 21)              { Console.WriteLine("\n" + "My name is " + name + " and I am old enough to vote or drink."); }

    else if (age >= 18 || age < 21)  { Console.WriteLine("\n" + "My name is " + name + " and I am old enough to vote, but not yet old enough to drink."); }

​

}

​

oldEnoughToVoteOrDrink();

​

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Console.WriteLine(borderLine);

///////////////////////////////////

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//Simple Function With No Parameters And Returns Date//

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string getCurrentDate()

{

    string date = System.DateTime.Now.ToLongDateString();

    return date;

}

​

Console.WriteLine("\n" + "The date is currently: " + getCurrentDate());