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[C#]Loops – 10

Write a program to calculate the Nth Catalan number by given N.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
    class NthCatalan
    {
        static void Main()
        {
            Console.WriteLine("Type a number \"N\" (N>0) to see the Nth Catalan number: ");
            int N = 10;
            decimal dividend = 1m;
            decimal dividerOne = 1m;
            decimal dividerTwo = 1m;
            decimal nC = 1m;
 
            for (int i = 1; i <= (2*N); i++)
            {
                dividend *= i;
            }
            for (int j = 1; j <= (1+N); j++)
            {
                dividerOne *= j;
            }
            for (int k = 1; k <= N; k++)
{
dividerTwo *= k;
}
            nC = dividend / (dividerOne * dividerTwo);
            Console.WriteLine(nC);
        }
    }
 

[C#]Loops – 8

Write a program that calculates the greatest common divisor (GCD) of given two numbers.

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using System;
 
class FindGCDofTwoNum
{
    static void Main()
    {
        Console.WriteLine("Type first number and press ENTER:");
        int firstInput = int.Parse(Console.ReadLine());
        Console.WriteLine("Type second number and press ENTER:");
        int secondInput = int.Parse(Console.ReadLine());
 
        while (firstInput!= 0 && secondInput!= 0)
        {
            if (firstInput> secondInput)
            {
                firstInput %= secondInput;
            }
            else
            {
                secondInput %= firstInput;
            }
        }
 
        if (firstInput == 0)
        {
            Console.WriteLine("The GCD is {0}", secondInput);
        }
        else
        {
            Console.WriteLine("The GCD is {0}", firstInput);
        }
    }
}
 

[C#]Loops – 7

Write a program that reads a number N and calculates the sum of the first N members of the sequence of Fibonacci: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, …

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using System;
 
class PrintFirsNnumbOfFibonacci
{
    static void Main()
    {
        ulong firstNumber = 0;
        ulong secondNumbr = 1;
        ulong thirdNumber = firstNumber + secondNumbr;
        ulong sum = firstNumber+secondNumbr+thirdNumber;
        Console.WriteLine("Type how many numbers from the Fibonacci Seq you want to sum (starting from 0 at first position) ");
        int N = int.Parse(Console.ReadLine());
 
        if (N == 1)
        {
            Console.WriteLine("Sum of the first member of the Fibonacci Seq = {0}", N-1);
        }
        if (N == 2)
        {
            Console.WriteLine("Sum of the first {0} members of the Fibonacci Seq = {1}", N, N - 1);
        }
        if (N == 3)
        {
            Console.WriteLine("Sum of the first {0} members of the Fibonacci Seq = {1}", N, N - 1);
        }
        if(N > 3)
        {
            for (int i = 1; i <= N - 3; i++)
            {
                firstNumber = secondNumbr;
                secondNumbr = thirdNumber;
                thirdNumber = firstNumber + secondNumbr;
                sum = sum + thirdNumber;
            }
            Console.WriteLine("Sum of the first {0} members of the Fibonacci Seq = {1}", N, sum);
        }
        
    }
}
 

[C#]Loops – 6

Write a program that, for a given two integer numbers N and X, calculates the sum S = 1 + 1!/X + 2!/X2 + … + N!/XN

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using System;
 
    class CalcTheSum
    {
        static void Main()
        {
            Console.WriteLine("Type number N and press ENTER:");
            int N = int.Parse(Console.ReadLine());
            Console.WriteLine("Type number X and press ENTER:");
            int X = int.Parse(Console.ReadLine());
            decimal dividend = 1m;
            decimal divider = 1m;
            decimal sum = 1m;
 
                for (int j = 1; j <= N; j++)
                {
                        dividend *= j;
                        divider *= X;
                        sum = sum + (dividend / divider);
                }
                Console.WriteLine("The Sum \"S\" = {0}", sum);
        }
    }
 

[C#]Conditional Statements – 11*

Write a program that converts a number in the range [0…999] to a text corresponding to its English pronunciation.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
    class ConverNtoText
    {
        static void Units(int lastDigit)
        {
            List<string> listUnits = new List<string>() { "", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            Console.Write("{0} ", listUnits[lastDigit]);
        }
        static void Tens(int middleDigit)
        {
            List<string> listTens = new List<string>() {"", "twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety"};
            Console.Write("{0} ", listTens[middleDigit - 1]);
        }
        static void Teens(int teenGroup)
        {
            List<string> listTeens = new List<string>() { "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
            Console.Write("{0} ", listTeens[teenGroup - 10]);
        }
        static void Main()
        {
            Console.WriteLine("Type a number (0 - 999) and press ENTER:");
            int input = int.Parse(Console.ReadLine());
 
            int lastDigit = input % 10;
            int middleDigit = (input / 10) % 10;
            int firstDigit = (input / 100) % 100;
            int teenGroup = input - (firstDigit * 100);
            if (firstDigit == 0)
            {
                if (middleDigit == 0 && lastDigit == 0)
                {
                    Console.Write("zero");
                }
 
                if (middleDigit == 0 && lastDigit != 0)
                {
                    Units(lastDigit);
                }
 
                if (middleDigit > 1)
                {
                    Tens(middleDigit);
                    Units(lastDigit);
                }
                if (teenGroup > 9 && teenGroup <20 )
                {
                    Teens(teenGroup);
                }
            }
            if (firstDigit > 0)
            {
                if (middleDigit > 1)
                {
                    Units(firstDigit);
                Console.Write("hundred ");
                Tens(middleDigit);
                Units(lastDigit);
                }
                if (middleDigit == 0 && lastDigit == 0)
                {
                    Units(firstDigit);
                    Console.Write("hundred");
                }
                if (middleDigit == 0 && lastDigit != 0)
                {
                Units(firstDigit);
                Console.Write("hundred and ");
                Units(lastDigit);
                }
                if (teenGroup > 9 && teenGroup < 20)
                {
                    Units(firstDigit);
                    Console.Write("hundred and ");
                    Teens(teenGroup);
                }
            }
 
            Console.WriteLine();
        }
    }