c# console application programs

1. C# Console Application
Examples (50+ C# Examples)
4 years ago
2 Comments
by Mike
67,039 views
C# is a simple, modern, general-purpose, object-oriented and high-level programming language
originally developed by Microsoft and released in 2002. This tutorial gives a complete
understanding of C#. This reference will take you through simple and practical approaches while
learning C# Programming language.
There are more over 40 examples in this C# examples list. And C# Examples are listing from
basic to complex
Basic C# Examples
Example 1: C# Program to Print Hello World
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class Program
{
staticvoid Main(string[] args)
{
Console.WriteLine("Hello World!");
Console.ReadKey();
}
}
Example 2: C# Program to Print an Integer Entered by User
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class Program
{
staticvoid Main(string[] args)
{
int number;
Console.Write("Enter a number:");
number = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("You entered :{0}",number);
Console.ReadLine();
}
}

2. Example 3: C# Program to Add Two Integers
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class Program
{
staticvoid Main(string[] args)
{
int num1, num2, sum;
Console.WriteLine("Calculate the sum of two numbers:");
Console.Write("Input number1:");
num1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Input number2:");
num2 = Convert.ToInt32(Console.ReadLine());
sum = num1 + num2;
Console.Write("Result:"+sum);
Console.ReadKey();
}
}
Example 4: C# Program to Multiply two Floating Point Numbers Entered by User
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class Program
{
staticvoid Main(string[] args)
{
float number1,number2,product;
Console.Write("Enter a number1:");
number1 = Convert.ToSingle(Console.ReadLine());
Console.Write("Enter a number2:");
number2 = Convert.ToSingle(Console.ReadLine());
product = number1 * number2;
Console.WriteLine("{0} * {1} = {2}",number1,number2, product);
Console.ReadLine();
}
}
Example 5: Multiply Two Floating Point Numbers in C# Console
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class Program
{
staticvoid Main(string[] args)
{
float number1,number2,product;
number1 = 12.45f;
number2 = 10.74f;
product = number1 * number2;

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Console.WriteLine("{0} * {1} = {2}",number1,number2, product);
Console.ReadLine();
}
}
Example 6: C# Program to Compute Quotient and Remainder
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class Program
{
staticvoid Main(string[] args)
{
int dividend = 50, divisor = 8;
int quotient = dividend / divisor;
int remainder = dividend % divisor;
Console.WriteLine("Dividend:{0} Divisor:{1}",dividend,divisor);
Console.WriteLine("Quotient = " + quotient);
Console.WriteLine("Remainder = " + remainder);
Console.ReadLine();
}
}
Example 7: Program To Calculate the Simple Interest in C#
Code:
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int P, T;
float R, SI;
Console.Write("Enter Amount :");
P = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter Rate :");
R = Convert.ToSingle(Console.ReadLine());
Console.Write("Enter Time :");
T = Convert.ToInt32(Console.ReadLine());
SI = P * R * T / 100;
Console.WriteLine("Interest is :{0}", SI);
Console.ReadKey();
Console.ReadLine();
Output:

4. Example 8: C# Calculate Rectangle Area
Code:
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class Program
{
staticvoid Main(string[] args)
{
int area, length, width;
Console.Write("Please write the length of your rectangle: ");
length = Convert.ToInt32(Console.ReadLine());
Console.Write("Please write the width of your rectangle: ");
width = Convert.ToInt32(Console.ReadLine());
area = length * width;
Console.WriteLine("The area of rectangle : {0}", area);
Console.ReadKey();
}
}
Output:

5. Example 9: C# Square Area and Perimeter Calculator
Code:
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staticvoid Main(string[] args)
{
int squareheight,area,perimeter;
Console.Write("What is theheight of your square? :");
squareheight = Convert.ToInt32(Console.ReadLine());
area = squareheight * squareheight;
perimeter = 4 * squareheight;
Console.WriteLine("Area : {0}nPerimeter : {1}",area,perimeter); // "n"--> new line
Console.ReadKey();
}
Output:
Example 10: Area and Perimeter of Circle in C# Console Application
Code:
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class Program
{
staticvoid Main(string[] args)
{
double r,perimeter, area;
Console.Write("Please write the radius of your circle : ");
r = Convert.ToDouble(Console.ReadLine());
perimeter = 2 * 3.14 * r;
area = 3.14 * Math.Pow(r, 2);//area = 3.14 * r * r;
Console.WriteLine("=============================================");
Console.WriteLine("The perimeter of yor circle : {0}",perimeter);
Console.WriteLine("The area of yor circle : {0}", area);
Console.ReadKey();
}
}

6. Example 11: Program to finds the average of 3 numbers in C#
Code:
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class Program
{
staticvoid Main(string[] args)
{
int number1,number2,number3,avarage;
Console.Write("Enter 1st number :");
number1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter 2nd number :");
number2 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter 3rd number :");
number3 = Convert.ToInt32(Console.ReadLine());
avarage = (number1 + number2 + number3) / 3;
Console.Write("Avarage of three numbers is {0}",avarage);
Console.ReadKey();
}
}
Output:

7. Example 12: C# Math.Pow Example
Code:
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double baseNumber, powerNumber;
Console.Write("Enter base number :");
baseNumber = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter exponent number :");
powerNumber = Convert.ToDouble(Console.ReadLine());
double returnNumber = Math.Pow(baseNumber, powerNumber);
Console.WriteLine("{0}^{1} = {2}", baseNumber, powerNumber, returnNumber);
Console.ReadLine();
Output:

8. Example 13: C# Math.Pow Negative Exponent Example
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double baseNumber, powerNumber;
Console.Write("Enter base number :");
baseNumber = Convert.ToDouble(Console.ReadLine()); //2
Console.Write("Enter exponent number :");
powerNumber = Convert.ToDouble(Console.ReadLine()); //-2
double returnNumber = Math.Pow(baseNumber, powerNumber);
Console.WriteLine("{0}^{1} = {2}", baseNumber, powerNumber, returnNumber);
Console.ReadLine();
Output:

9. Example 14: C# Program to Count Number of Words in a String
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staticvoid Main(string[] args)
{
string sentence;
Console.Write("Enter String : ");
sentence = Console.ReadLine();
string[] words = sentence.Split(' ');
Console.WriteLine("Count of words :"+words.Length);
Console.ReadKey();
}
Output:

10. Example 15: Convert Dollars to Cents in C#
Solution 1: Calculate in Main Method
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class Program
{
staticvoid Main(string[] args)
{
double dollar_amount;
int cents;
// int compute_cents;
Console.Write("Enter dollar amount :");
dollar_amount = Convert.ToDouble(Console.ReadLine());
cents =(int) (dollar_amount * 100);
Console.WriteLine("{0} $ = {1} ¢",dollar_amount,cents);
Console.ReadLine();
}
}
Solution 2: Calculate with Custom Method
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class Program
{
staticvoid Main(string[] args)
{
double dollar_amount;
int cents;
// int compute_cents;
Console.Write("Enter dollar amount :");
dollar_amount = Convert.ToDouble(Console.ReadLine());
cents = compute_cents(dollar_amount);
Console.WriteLine("{0} $ = {1} ¢",dollar_amount,cents);
Console.ReadLine();
}
staticint compute_cents(double dollar_amount)
{
return (int)(dollar_amount * 100);
}
}
Output:

11. For More Simple Examples
C# Conditional Examples
Example 16: Fibonacci Series in C# with Method
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace test
{
class Program
{
staticlong[] numbers;

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staticlong Fib(int n)
{
if (0 == numbers[n])
{
numbers[n] = Fib(n - 1) + Fib(n - 2);
}
return numbers[n];
}
staticvoid Main()
{
Console.Write("n = ");
int n = int.Parse(Console.ReadLine());
numbers = new long[n + 2];
numbers[1] = 1;
numbers[2] = 1;
long result = Fib(n);
Console.WriteLine("fib({0}) = {1}", n, result);
Console.ReadKey();
}
}
}
Output:
Example 17: Find Number is Even or Odd using if else Statement in C#
Code 1:
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staticvoid Main(string[] args)
{
int n;
Console.Write("Enter an integer : ");
n = Int32.Parse(Console.ReadLine());
if(n%2==0)
{
Console.WriteLine("{0} is even",n);
}
else

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{
Console.WriteLine("{0} is odd", n);
}
Console.ReadKey();
}
Code 2 (with static method):
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class Program
{
staticbool IsEvenNumber(int num)
{
if (num % 2 == 0)
{
return true;
}
else
{
return false;
}
}
staticvoid Main(string[] args)
{
int n;
Console.Write("Enter an integer : ");
n = Int32.Parse(Console.ReadLine());
if (IsEvenNumber(n))
{
Console.WriteLine("{0} is even", n);
}
else
{
Console.WriteLine("{0} is odd", n);
}
Console.ReadKey();
}
}
Output:

14. Example 18: Find Numbers Above and Below the Average in C#
C# Code:
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staticvoid Main(string[] args)
{
int counter = 0;
int[] numbers = new int[10];
int sum=0,avg=0,low=0,high=0;
for(int i=0;i<10;i++)
{
Console.Write("Number {0}: ",(i+1));
numbers[i] = Convert.ToInt32(Console.ReadLine());
sum += numbers[i];
}
avg = sum / 10;
//avg = sum / numbers.Length;
for (int i=0;i<10;i++)
{
if(numbers[i]<avg)
{
low++;
}
else
{
high++;
}
}
Console.WriteLine("The average is : {0}", avg);
Console.WriteLine("The numbers above the average are: {0}", high);
Console.WriteLine("The numbers below the average are: {0}", low);
Console.ReadKey();
}
Output:

15. Example 19: C# Program to Print all Prime Numbers in an Interval
Source Code:
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staticvoid Main(string[] args)
{
int num1, num2,sayac=0;
Console.Write("Enter lower range: ");
num1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter upper range: ");
num2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Prime numbers between {0} and {1} are: ",num1,num2);
Console.WriteLine("==============================================");
for(int i=num1;i<num2;i++)
{
sayac = 0;
if(i>1)
{
for(int j=2;j<i;j++)
{
if(i%j==0)
{
sayac = 1;
break;
}
}
if(sayac==0)
{
Console.WriteLine(i);
}
}
}
Console.ReadKey();
}
Output:

16. Example 20: Finding the biggest of three numbers in C#
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staticvoid Main(string[] args)
{
int number1, number2, number3;
string result;
Console.Write("Input the first number :");
number1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Input the second number :");
number2 = Convert.ToInt32(Console.ReadLine());
Console.Write("Input the third number :");
number3 = Convert.ToInt32(Console.ReadLine());
if (number1 > number2 && number1 > number3)
{
result= "The 1st Number is the greatest among three. n";
}
else if (number2 > number1 && number2 > number3)
{
result = "The 2nd Number is the greatest among three n";
}
else
{
result= "The 3rd Number is the greatest among three n";
}
Console.WriteLine(result);
Console.ReadLine();
}
Output:
Example 21: Generates the Sum of N Numbers in C#

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class Program
{
staticvoid Main(string[] args)
{
int number, sum=0;
Console.Write("Enter a Number : ");
number = Convert.ToInt32(Console.ReadLine());
if(number<0)
{
Console.Write("Please Enter Positive Number");
}
else
{
while(number>0)
{
sum += number;
number -=1;
}
}
Console.WriteLine("The sum is "+sum);
Console.ReadKey();
}
}
Output:

18. Example 22: Counting program the total letter in text in C# Console
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staticvoid Main(string[] args)
{
string myString = Console.ReadLine();
int count = 0;
for (int i = 0; i < myString.Length; i++)
{
// check thechar for whitespace. If char is not whitespace, increase the count variable
if (!char.IsWhiteSpace(myString[i]))
{
count++;
}
}
Console.WriteLine("Total letters: "+ count);
Console.ReadLine();
}
Alternavite code (foreach loop):
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staticvoid Main(string[] args)
{
Console.Write("Enter string :");
string myString = Console.ReadLine();
int count = 0;
foreach (char item in myString)
{
// check thechar for whitespace. If char is not whitespace, increase the count variable
if (!char.IsWhiteSpace(item))
{
count++;
}
}
Console.WriteLine("Total letters: "+ count);
Console.ReadLine();
}
Output:

19. Example 23: Get Month Name From Month Number – C#(Switch Case)
C# Code:
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class Program
{
staticvoid Main(string[] args)
{
int monthNumber;
Console.Write("Enter Month Number (1 - 12): ");
monthNumber = Convert.ToInt32(Console.ReadLine());
switch (monthNumber)
{
case 1:
Console.WriteLine("January");
break;
case 2:
Console.WriteLine("February");
break;
case 3:
Console.WriteLine("March");
break;
case 4:
Console.WriteLine("April");
break;
case 5:
Console.WriteLine("May");
break;
case 6:
Console.WriteLine("June");
break;
case 7:
Console.WriteLine("July");

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break;
case 8:
Console.WriteLine("August");
break;
case 9:
Console.WriteLine("September");
break;
case 10:
Console.WriteLine("October");
break;
case 11:
Console.WriteLine("November");
break;
case 12:
Console.WriteLine("December");
break;
default:
Console.WriteLine("you did not enter correct value for month name");
break;
}
Console.ReadLine();
}
}
Output:
Example 24: Program Library Fine Calculation in C#
The fee structure is as follows:
1. If the book is returned on before 5 days, no fine will be charged.
2. If the book is returned after the expected return day (between 5 and 10 days) – fine: 0.5$
per day
3. If the book is returned after the expected return day (between 10 and 30 days) fine: 1$ per
day
4. If the book is not returned after 30 days, cancel membership. fine: 1.5$ per day
Code:

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class Program
{
staticvoid Main(string[] args)
{
int days;
float fine=0;
Console.Write("Enter totaldays:");
days = Convert.ToInt32(Console.ReadLine());
if(days <= 5)
{
fine = 0;
}
else if(days > 5 && days <= 10)
{
fine = (days - 5) * 0.5F;
}
else if(days > 10 && days <=30)
{
// ----5 days--- --between 10 and 30---
fine = 5 * 0.5F + (days - 10) * 1;
}
else
{
// -5 days- -10 , 30- - >30 -
fine = 5 * 0.5F + 20 * 1 + (days-30) * 1.5F;
Console.WriteLine("Canceled your Membership");
}
Console.WriteLine("Your fine:"+fine);
Console.ReadLine();
}
}
Output

22. Example 25: Program to Find Leap Year in C#
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staticvoid Main(string[] args)
{
int year;
Console.Write("Enter theYear :");
year = Convert.ToInt32(Console.ReadLine());
if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
Console.WriteLine("{0} is Leap Year",year);
else
Console.WriteLine("{0} is not a Leap Year",year);
Console.ReadLine();
}
Output:
For Mode If Else Examples
C# Loop Examples

23. Example 26: C# program to find min and max in an array
Code:
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class Program
{
staticvoid Main(string[] args)
{
//www.csharp-console-examples.com
int[] numbers = new int[10];
Random rnd = new Random();
int min, max;
for (int i = 0; i < numbers.Length; i++)
{
numbers[i] = rnd.Next(1, 100);
Console.WriteLine(numbers[i]);
}
min = numbers[0];
max = numbers[0];
for (int i = 1; i < numbers.Length; i++)
{
if (min > numbers[i])
min = numbers[i];
if (max < numbers[i])
max = numbers[i];
}
Console.WriteLine("=====================================");
Console.WriteLine("The highest number in the array: > > > " + max);
Console.WriteLine("The lowest number in thearray: > > > " + min);
Console.ReadKey();
}
}
Output:
C# program using for loop to find maximum value from an array

24. Example 27: C# Program to Calculate the Power of a Number Without Using Math.Pow
Code:(With for loop)
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class Program
{
staticvoid Main(string[] args)
{
int baseNumber, expNumber;
double result = 1;
Console.Write("Base Number : ");
baseNumber = Convert.ToInt32(Console.ReadLine());
Console.Write("exponent Number : ");
expNumber = Convert.ToInt32(Console.ReadLine());
bool sing = false;
if (expNumber > 0) sing = true;
expNumber = Math.Abs(expNumber);
for (int i = 1; i <= expNumber; i++)
{
if(sing)
result = result * baseNumber;
else
result /= baseNumber;
}
Console.WriteLine("Base {0} and exponent {1} Result = {2}", baseNumber, expNumber, result);
Console.ReadLine();
}
}

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Code: (With While Loop)
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class Program
{
staticvoid Main(string[] args)
{
int baseNumber, expNumber, result = 1;
Console.Write("Base Number : ");
baseNumber = Convert.ToInt32(Console.ReadLine());
Console.Write("exponent Number : ");
expNumber = Convert.ToInt32(Console.ReadLine());
while (expNumber != 0)
{
result *= baseNumber;
--expNumber;
}
Console.WriteLine("Result = {0}", result);
Console.ReadLine();
}
}
Output:

26. Example 28: C# Program to Find the Factorial of a Number
Source Code:
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staticvoid Main(string[] args)
{
int i, number, fact;
Console.WriteLine("Enter theNumber");
number = int.Parse(Console.ReadLine());
fact = number;
for (i = number - 1; i >= 1; i--)
{
fact = fact * i;
}
Console.WriteLine("nFactorial of Given Number is: "+fact);
Console.ReadLine();
}
Output:
Example 29: Display Numbers Between 1 to N Using For Loop
Code:
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staticvoid Main(string[] args)
{
int n;
Console.Write("Number :");
n = Convert.ToInt32(Console.ReadLine());

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for (int i = 1; i <= n; i++)
{
Console.WriteLine(i);
}
Console.ReadKey();
}
Output:
Example 30: Generates the Sum of N Numbers in C#
Code:
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class Program
{
staticvoid Main(string[] args)
{
int number, sum=0;
Console.Write("Enter a Number : ");
number = Convert.ToInt32(Console.ReadLine());
if(number<0)
{
Console.Write("Please Enter Positive Number");
}
else
{
while(number>0)
{
sum += number;
number -=1;
}
}
Console.WriteLine("The sum is "+sum);

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Console.ReadKey();
}
}
Output:
Example 31: C# Program to Print all Prime Numbers in an Interval
Source Code:
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staticvoid Main(string[] args)
{
int num1, num2,sayac=0;
Console.Write("Enter lower range: ");
num1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter upper range: ");
num2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Prime numbers between {0} and {1} are: ",num1,num2);
Console.WriteLine("==============================================");
for(int i=num1;i<num2;i++)
{
sayac = 0;
if(i>1)
{
for(int j=2;j<i;j++)
{
if(i%j==0)
{
sayac = 1;

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break;
}
}
if(sayac==0)
{
Console.WriteLine(i);
}
}
}
Console.ReadKey();
}
Output:
Example 32: Nested For Loop in C# (Multiplication Table)
Code 1:
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staticvoid Main(string[] args)
{ //www.csharp-console-examples.com
for (int i=1;i<=10;i++)
{
for (int j = 0; j <= 10; j++)
{
Console.WriteLine("{0}x{1} = {2}", i, j, i * j);
}
Console.WriteLine("====================");
}
Console.ReadKey();
}
Output:

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staticvoid Main(string[] args)
{ //www.csharp-console-examples.com
for (int j = 1; j <= 10; j++)
{
for (int i = 1; i <= 10; i++)
{
Console.Write("{0}*{1}={2}t", i, j, (i * j));
}
Console.WriteLine();
}
Console.ReadKey();
}
Output:

31. Example 33: Display Armstrong Number Between Two Intervals in C#
Code:
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staticvoid Main(string[] args)
{
int num1,num2, n, sum, r;
Console.Write("Enter positivenumber1 :");
num1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter positivenumber2 :");
num2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Armstrong Number from {0} to {1}",num1,num2);
for (int i = num1; i <= num2; i++)
{
sum = 0;
n = i;
while (n != 0)
{
r = n % 10;
sum = sum + (r * r * r);
n = n / 10;
}
if (i == sum)
Console.WriteLine(i);
}
Console.ReadKey();
}

32. Example 34: Checking for Palindrome Strings or Numbers in C#
Code:
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staticvoid Main(string[] args)
{
Console.Write("Enter something for to check that is it palindrome :");
string text = Console.ReadLine();
int len = text.Length;
bool flag = true;
//check palindrome
for (int i = 0; i < len/2; i++)
{
if (text[i] != text[len - (i + 1)])
{
flag = false;
break;
}
}
//if flag true, text is palindrome
if (flag)
{
Console.WriteLine("{0} is palindrome", text);
}
else
{
Console.WriteLine("{0} is not palindrome", text);
}
Console.ReadLine();
}

33. Example 35: Converting Algorithm of Decimal to Binary in C#
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class Program
{
staticvoid Main(string[] args)
{
int number;
Console.Write("Enter a Number : ");
number = int.Parse(Console.ReadLine());
int q;
string rem = "";
while (number >= 1)
{
q = number / 2;
rem += (number % 2).ToString();
number = q;
}
string binary = "";
for (int i = rem.Length - 1; i >= 0; i--)
{
binary = binary + rem[i];
}
Console.WriteLine("The Binary format for {0} is {1}",number, binary);
Console.ReadLine();
}
}
Other way: You can convert decimal to number, If you want to without think any algorithm
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class Program
{
staticvoid Main(string[] args)
{

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Console.Write("Enter a number : ");
int number = Convert.ToInt32(Console.ReadLine());
string binary = Convert.ToString(number, 2);
Console.WriteLine("The Binary format for {0} is {1}",number, binary);
Console.ReadLine();
}
}
Output:
Example 36: Find The Second Largest Number in Array Using C#
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staticvoid Main(string[] args)
{
int n, i, j = 0, largest, secondLargest;
int[] arr1 = new int[50];
Console.Write("nnFind the second largest element in an array :n");
Console.Write("-----------------------------------------n");
Console.Write("Input the sizeof array : ");
n = Convert.ToInt32(Console.ReadLine());
/* Stored values into the array*/
Console.Write("Input {0} elements in the array :n", n);
for (i = 0; i < n; i++)
{
Console.Write("element - {0} : ", i);
arr1[i] = Convert.ToInt32(Console.ReadLine());
}
/* find location of the largest element in the array */
largest = 0;
for (i = 0; i < n; i++)
{
if (largest < arr1[i])

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{
largest = arr1[i];
j = i;
}
}
/* ignore the largest element and find the 2nd largest element in the array */
secondLargest = 0;
for (i = 0; i < n; i++)
{
if (i == j)
{
i++; /* ignoring the largest element */
i--;
}
else
{
if (secondLargest < arr1[i])
{
secondLargest = arr1[i];
}
}
}
Console.Write("The Second largest element in the array is : {0} nn", secondLargest);
Console.ReadKey();
}
Example 36: Enter Only Numbers in C# Console Application using do-while loop
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staticvoid Main(string[] args)
{
double val = 0;
string num = "";
Console.Write("Enter Number: ");
ConsoleKeyInfo chr;
do
{
chr = Console.ReadKey(true);
if (chr.Key != ConsoleKey.Backspace)
{
bool control = double.TryParse(chr.KeyChar.ToString(), out val);
if (control)
{
num += chr.KeyChar;
Console.Write(chr.KeyChar);
}
}
else
{
if (chr.Key == ConsoleKey.Backspace && num.Length > 0)
{
num = num.Substring(0, (num.Length - 1));
Console.Write("b b");
}
}
}
while (chr.Key != ConsoleKey.Enter);
Console.ReadKey();

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}
Example 37: C# Program to Calculate the Power of a Number Without Using Math.Pow using
while loop
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class Program
{
staticvoid Main(string[] args)
{
int baseNumber, expNumber, result = 1;
Console.Write("Base Number : ");
baseNumber = Convert.ToInt32(Console.ReadLine());
Console.Write("exponent Number : ");
expNumber = Convert.ToInt32(Console.ReadLine());
while (expNumber != 0)
{
result *= baseNumber;
--expNumber;
}
Console.WriteLine("Result = {0}", result);
Console.ReadLine();
}
}
Example 38: Fibonacci Series in C# with Method
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace test
{
class Program
{
staticlong[] numbers;
staticlong Fib(int n)
{
if (0 == numbers[n])
{
numbers[n] = Fib(n - 1) + Fib(n - 2);
}
return numbers[n];
}
staticvoid Main()
{
Console.Write("n = ");

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int n = int.Parse(Console.ReadLine());
numbers = new long[n + 2];
numbers[1] = 1;
numbers[2] = 1;
long result = Fib(n);
Console.WriteLine("fib({0}) = {1}", n, result);
Console.ReadKey();
}
}
}
Example 39: Calculate Sum and Average of an Array in C#
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staticvoid Main()
{
double sum=0, avg=0;
double[] numbers = { 10, 20, 50, 40};
for(int i=0;i<numbers.Length;i++)
{
sum += numbers[i];
}
avg = sum / numbers.Length;
Console.WriteLine("The Sum is : "+sum);
Console.WriteLine("The Average is : "+avg);
Console.ReadKey();
}
Example 40: Find Numbers Above and Below the Average in C#
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staticvoid Main(string[] args)
{
int counter = 0;
int[] numbers = new int[10];
int sum=0,avg=0,low=0,high=0;
for(int i=0;i<10;i++)
{
Console.Write("Number {0}: ",(i+1));
numbers[i] = Convert.ToInt32(Console.ReadLine());
sum += numbers[i];
}
avg = sum / 10;
//avg = sum / numbers.Length;
for (int i=0;i<10;i++)
{
if(numbers[i]<avg)
{
low++;
}
else
{
high++;

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}
}
Console.WriteLine("The average is : {0}", avg);
Console.WriteLine("The numbers above the average are: {0}", high);
Console.WriteLine("The numbers below the average are: {0}", low);
Console.ReadKey();
}
Find The Longest Word in String
Array
class Program
{
staticvoid Main(string[] args)
{
string[] arr = { "Chsarp", "Console","Examples","www.csharp-console-examples.com" };
string longWord = "";
int Wordcount = 0;
foreach (string item in arr)
{
if (item.Length > Wordcount)
{
Wordcount = item.Length;
longWord = item;
}
}
Console.WriteLine("The longest word: {0} nLetters count : {1}", longWord, Wordcount);
Console.ReadKey();
}
}
Output: