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### C# program to print fibonacci series

A prime number is not divisible by any other number apart from 1 and itself. So, we use this logic in this program to determine if a number is prime.

using System;

namespace SamplePrograms
{
class FibonacciSeries
{
public static void Main()
{
// Prompt the user to enter their target number
Console.WriteLine("How many numbers do you want in the fibonacci series");

// Read the user input from console and convert to integer

// Create integer variables to hold previous and next numbers
int PreviousNumber = -1, NextNumber = 1;

// This for loop controls the number of fibonacci series elements
for (int i = 0; i < Target; i++)
{
// Logic to compute fibonacci series numbers
int Sum = PreviousNumber + NextNumber;
PreviousNumber = NextNumber;
NextNumber = Sum;
Console.Write(NextNumber + "  ");
}

}
}
}
A prime number is not divisible by any other number apart from 1 and itself. So, we use this logic in this program to determine if a number is prime.

1. print stars in diamond,find number of vowels in a string

1. Find No of vowel :-

public int NoOfVowel(string str)
{
int i = 0;
char[] cArray = str.ToCharArray();

i = cArray.Count(a => a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u');

return i;
}