Fibonacci Series

Example - 0, 1, 1, 2, 3, 5, 8, 13, 21

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;
}
}
}

Output:

Enter the number of elements: 15
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377

Prime Number

Example - 2, 3, 5, 7, 11, 13, 17, 19, 23....

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.");
}
}

Output:

Enter the Number to check Prime: 17  
Number is Prime.

Enter the Number to check Prime: 57  
Number is not Prime.

Palindrome Number

Example - 121, 34543, 343, 131, 48984

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");
}
}

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Palindrome program

A palindrome number is a number that is same after reverse. For example 121, 34543, 343, 131, 48984 are the palindrome numbers.

Palindrome number algorithm

Get the number from user
Hold the number in temporary variable
Reverse the number
Compare the temporary number with reversed number
If both numbers are same, print palindrome number
Else print not palindrome number

Let's see the palindrome program in C#. In this program, we will get an input from the user and check whether number is palindrome or not.

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");
}
}

Output:

Enter the Number=121   
Number is Palindrome.

Enter the number=113  
Number is not Palindrome.

Factorial

4! = 4*3*2*1 = 24
6! = 6*5*4*3*2*1 = 720

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);
}
}

Output:

Enter any Number: 6
Factorial of 6 is: 720

Armstrong Number

0, 1, 153, 370, 371 and 407

371 = (3*3*3)+(7*7*7)+(1*1*1)
where:
(3*3*3)=27
(7*7*7)=343
(1*1*1)=1
So:
27+343+1=371

using System;
  public class ArmstrongExample
{
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+(r*r*r);
n=n/10;
}
if(temp==sum)
Console.Write("Armstrong Number.");
else
Console.Write("Not Armstrong Number.");
}
}

Output:

Enter the Number= 371
Armstrong Number.

Enter the Number= 342   
Not Armstrong Number.

reverse number

using System;
  public class ReverseExample
{
public static void Main(string[] args)
{
int  n, reverse=0, rem;
Console.Write("Enter a number: ");
n= int.Parse(Console.ReadLine());
while(n!=0)
{
rem=n%10;
reverse=reverse*10+rem;
n/=10;
}
Console.Write("Reversed Number: "+reverse);
}
}

Output:

Enter a number: 234  
Reversed Number: 432

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