C# Basic Programs

 

1) Print Hello World! 

Code:
namespace HelloWorld { class Hello { static void Main(string[] args) { System.Console.WriteLine("Hello World!"); } } }

2) Fibonacci Series 

Code:
using System; public class FibonacciExample { public static void Main(string[] args) { int n1=0,n2=1,n3,i,number; Console.Write("Enter the number of elements: "); number = int.Parse(Console.ReadLine()); Console.Write(n1+" "+n2+" "); //printing 0 and 1 for(i=2;i<number;++i) //loop starts from 2 because 0 and 1 are already printed { n3=n1+n2; Console.Write(n3+" "); n1=n2; n2=n3; } } }

3) Prime Number Program 

Code:
using System; public class PrimeNumberExample { public static void Main(string[] args) { int n, i, m=0, flag=0; Console.Write("Enter the Number to check Prime: "); n = int.Parse(Console.ReadLine()); m=n/2; for(i = 2; i <= m; i++) { if(n % i == 0) { Console.Write("Number is not Prime."); flag=1; break; } } if (flag==0) Console.Write("Number is Prime."); } }

4) Palindrome program 

Code:
using System; public class PalindromeExample { public static void Main(string[] args) { int n,r,sum=0,temp; Console.Write("Enter the Number: "); n = int.Parse(Console.ReadLine()); temp=n; while(n>0) { r=n%10; sum=(sum*10)+r; n=n/10; } if(temp==sum) Console.Write("Number is Palindrome."); else Console.Write("Number is not Palindrome"); } }

5) Factorial program 

Code:
using System; public class FactorialExample { public static void Main(string[] args) { int i,fact=1,number; Console.Write("Enter any Number: "); number= int.Parse(Console.ReadLine()); for(i=1;i<=number;i++){ fact=fact*i; } Console.Write("Factorial of " +number+" is: "+fact); } }