program to Print Sum of factorial Series in C

C# program to Print Sum of factorial Series

Program Statement:

Write a program to display the sum of the following series.

2/1! + 4/3! + 6/5! + 8/7! + 10/9! + . . . + n/(n-1)!

Solution:

 public class factorial
 {
 int n;
 public void ser()
 {
 double f, sum = 2, res = 1, up = 2;

 Console.WriteLine(" Series = 2/1! + 4/3! + 6/5! + 8/7! + 10/9! + . . . + n/(n-1)!");
 Console.WriteLine();
 Console.Write(" Enter ending point : ");
 n = Convert.ToInt16(Console.ReadLine());

 for (int i = 2; i <= n; i++)
 {
 if (i % 2 == 1)
 {
 f = 1;
 for (int x = i; x > 0; x--)
 { f = f * x; }
 up = up + 2;
 res = up / f;
 sum = sum + res;
 }
 }
 Console.WriteLine(" Sum : {0} ", sum);
 Console.WriteLine();
 }
 } 

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C program to print Factorial of all Prime numbers in csharp

C# program to print Factorial of all Prime numbers

Program Statement:

Write a program using loop which takes one value n from user and show the factorial of all prime numbers which are less then n. e.g. if n = 10 then program will print the factorial of 2,3,5,7.

Solution:

 public class fop
 {
 int x, a, b, p, fac=1;
 public void fact()
 {
 Console.WriteLine(" Show factorial of primes less than n ");
 Console.Write(" Enter ending point : ");
 x = Convert.ToInt32(Console.ReadLine());
 for (a = 2; a < x; a++)
 {
 p = 1;
 for (b = 2; b < a; b++)
 {
 if (a % b == 0)
 { p = 0; }
 }
 if (p == 1)
 {
 fac = 1;
 for (int c = 1; c <= a; c++)
 { fac = fac * c;}
 Console.Write(" Factorial of {0} is : {1} ", a,fac);
 }
 }
 Console.WriteLine(" ");
 }
 } 

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Program to print sum of factorial of Odd series in C

C# Program to print sum of factorial of Odd series

Program Statement:

Write a program to display the sum of the following series i.e. sum of the factorial of odd series

1! + 3! + 5! + 7! + 9! + . . . + n!

Solution:

 static void Main(string[] args)
 {
 int i, j, f,last, sum = 0;
 Console.WriteLine("Enter Last value:");
 last = Convert.ToInt32(Console.ReadLine());
 i = 1;
 while (i <= last)
 {
 f = 1;
 j = i;
 while (j >= 1)
 {
 f = f * j;
 j--;
 }
 sum = sum + f;
 Console.WriteLine("factorial of " +i+"="+f);
 i = i + 2;
 }
 Console.WriteLine("sum of all factorial = " + sum);
 Console.ReadLine();
 }

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C Program to print sum of the factorial of odd series multiply with x where power of x is square of corresponding number

C# Program to print sum of the factorial of odd series multiply with x where power of x is square of corresponding number

Program Statement:

Write a program to display the sum of the following series i.e. sum of the factorial of odd series multiply with x where power of x is square of corresponding number.

X1*1! + X9*3! + X25*5! + X49*7! + X81*9! + . . . + Xn2*n!

Solution:

 class _power
 {
 long n, f, x, sum = 0;
 public long power(long a, long b)
 {
 long res = 1;
 for (int i = 1; i <= b; i++)
 res = res * a;
 return res;
 }
 public void cal()
 {
 Console.WriteLine(" Series X^1*1! + X^9*3 +...+X^n2*n! ");
 Console.Write(" Enter value of x : ");
 x = Convert.ToInt32(Console.ReadLine());
 Console.Write(" Enter ending point : ");
 n = Convert.ToInt32(Console.ReadLine());
 for (int i = 1; i <= n; i++)
 {
 if (i % 2 != 0)
 {
 f = 1;
 for (int j = i; j >= 1; j--)
 f = f * j;
 sum = sum + ((power(x, i * i)) * f);
 }
 }
 Console.WriteLine(" Result = {0} ", sum);
 }
 } 

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C Program which calculated factorial to prime function

C# Program which calculated factorial to prime function

Program Statement:

Write two functions max(int,int) and prime(int). max function will take two arguments and will return the maximum of two numbers in main. Then main function will pass this calculated factorial to prime function which will show that passed value is prime or not.

Solution:

 public class _max
 {
 public int max(int a, int b)
 {
 if (a > b)
 return a;
 else
 return b;
 }
 public void prime(int n)
 {
 if (n == 1)
 Console.WriteLine(" {0} is maximum but not prime number! ", n);
 if (n >= 2)
 {
 if (n % 2 != 0)
 {
 Console.WriteLine(" {0} is maximum and Prime number! ", n);
 }
 else
 { Console.WriteLine(" {0} is maximum but not a Prime number! ", n); }
 }
 }
 } 

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