C# Sharp Exercises: Check a number is prime number or not
C# Sharp Recursion : Exercise-7 with Solution
Write a program in C# Sharp to check whether a number is prime or not using recursion.
Pictorial Presentation:
Sample Solution:
C# Sharp Code:
using System;
class RecExercise7
{
public static int Main()
{
int n1,primeNo;
Console.WriteLine("\n\n Recursion : Check a number is prime number or not :");
Console.WriteLine("--------------------------------------------------------");
Console.Write(" Input any positive number : ");
n1 = Convert.ToInt32(Console.ReadLine());
primeNo = checkForPrime(n1,n1/2);//call the function checkForPrime
if(primeNo==1)
Console.Write(" The number {0} is a prime number. \n\n",n1);
else
Console.WriteLine(" The number {0} is not a prime number. \n\n",n1);
return 0;
}
static int checkForPrime(int n1,int i)
{
if(i==1)
{
return 1;
}
else
{
if(n1 %i==0)
return 0;
else
return checkForPrime(n1,i-1);//calling the function checkForPrime itself recursively
}
}
}
Sample Output:
Recursion : Check a number is prime number or not : -------------------------------------------------------- Input any positive number : 5 The number 5 is a prime number.
Flowchart :
C# Sharp Code Editor:
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Next: Write a program in C# Sharp to Check whether a given String is Palindrome or not using recursion.
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