1.
Write a C# Sharp program to print Hello and your name in a
separate line.
public class Exercise1
{
public static void Main( )
{
System.Console.WriteLine("Hello");
System.Console.WriteLine("Alexandra Abramov!");
}
}
2. Write a C# Sharp program to print the sum of two numbers.
public class Exercise2
{
public static void Main()
{
System.Console.WriteLine(15+17);
}
}
3. Write a C# Sharp program to swap two numbers.
using System;
public class Exercise5
public static void Main(string[] args)
int number1, number2, temp;
Console.Write("\nInput the First Number : ");
number1 = int.Parse(Console.ReadLine());
Console.Write("\nInput the Second Number : ");
number2 = int.Parse(Console.ReadLine());
temp = number1;
number1 = number2;
number2 = temp;
Console.Write("\nAfter Swapping : ");
Console.Write("\nFirst Number : "+number1);
Console.Write("\nSecond Number : "+number2);
Console.Read();
4. Write a C# Sharp program that takes four numbers as input to
calculate and print the average
using System;
public class Exercise9
public static void Main()
int number1,number2,number3,number4;
Console.Write("Enter the First number: ");
number1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter the Second number: ");
number2 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter the third number: ");
number3 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter the four number: ");
number4 = Convert.ToInt32(Console.ReadLine());
int result = (number1 + number2 + number3 + number4) / 4;
Console.WriteLine("The average of {0} , {1} , {2} , {3} is: {4} ",
number1, number2, number3, number4, result);
5. Write a C# program to convert from celsius degrees to Kelvin and
Fahrenheit
using System;
public class Exercise14
public static void Main( )
Console.Write("Enter the amount of celsius: ");
int celsius = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Kelvin = {0}", celsius + 273);
Console.WriteLine("Fahrenheit = {0}", celsius * 18 / 10 + 32);
6. Write a C# Sharp program that takes three letters as input and
display them in reverse order.
using System;
public class Exercise1
public static void Main()
char letter,letter1,letter2;
Console.Write("Input letter: ");
letter = Convert.ToChar(Console.ReadLine());
Console.Write("Input letter: ");
letter1 = Convert.ToChar(Console.ReadLine());
Console.Write("Input letter: ");
letter2 = Convert.ToChar(Console.ReadLine());
Console.WriteLine("{0} {1} {2}",letter2,letter1,letter);
7. Write a C# Sharp program to check whether a given number is
even or odd.
using System;
public class Exercise2
public static void Main()
int num1, rem1;
Console.Write("\n\n");
Console.Write("Check whether a number is even or odd :\n");
Console.Write("---------------------------------------");
Console.Write("\n\n");
Console.Write("Input an integer : ");
num1= Convert.ToInt32(Console.ReadLine());
rem1 = num1 % 2;
if (rem1 == 0)
Console.WriteLine("{0} is an even integer.\n",num1);
else
Console.WriteLine("{0} is an odd integer.\n",num1);
8. Write a C# Sharp program to find the sum of first 10 natural
numbers.
using System;
public class Exercise2
public static void Main()
int j, sum = 0;
Console.Write("\n\n");
Console.Write("Find the sum of first 10 natural numbers:\n");
Console.Write("----------------------------------------------");
Console.Write("\n\n");
Console.Write("The first 10 natural number is :\n");
for (j = 1; j <= 10; j++)
sum = sum + j;
Console.Write("{0} ",j);
Console.Write("\nThe Sum is : {0}\n", sum);
}
9. Write a program in C# Sharp to store elements in an array and print
it.
using System;
public class Exercise1
public static void Main()
int[] arr = new int[10];
int i;
Console.Write("\n\nRead and Print elements of an array:\n");
Console.Write("-----------------------------------------\n");
Console.Write("Input 10 elements in the array :\n");
for(i=0; i<10; i++)
Console.Write("element - {0} : ",i);
arr[i] = Convert.ToInt32(Console.ReadLine());
Console.Write("\nElements in array are: ");
for(i=0; i<10; i++)
Console.Write("{0} ", arr[i]);
Console.Write("\n");
}
10. Write a program in C# Sharp to find the sum of all elements
of the array.
using System;
public class Exercise3
public static void Main()
int[] a= new int[100];
int i, n, sum=0;
Console.Write("\n\nFind sum of all elements of array:\n");
Console.Write("--------------------------------------\n");
Console.Write("Input the number of elements to be stored in the
array :");
n = Convert.ToInt32(Console.ReadLine());
Console.Write("Input {0} elements in the array :\n",n);
for(i=0;i<n;i++)
Console.Write("element - {0} : ",i);
a[i] = Convert.ToInt32(Console.ReadLine());
for(i=0; i<n; i++)
sum += a[i];
}
Console.Write("Sum of all elements stored in the array is : {0}\n\n",
sum);
11. Write a program in C# Sharp to copy the elements one array
into another array.
using System;
public class Exercise4
public static void Main()
int[] arr1 = new int[100];
int[] arr2 = new int[100];
int i, n;
Console.Write("\n\nCopy the elements one array into another array
:\n");
Console.Write("----------------------------------------------------\n");
Console.Write("Input the number of elements to be stored in the
array :");
n = Convert.ToInt32(Console.ReadLine());
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());
/* Copy elements of first array into second array.*/
for(i=0; i<n; i++)
arr2[i] = arr1[i];
/* Prints the elements of first array */
Console.Write("\nThe elements stored in the first array are :\n");
for(i=0; i<n; i++)
Console.Write("{0} ", arr1[i]);
/* Prints the elements copied into the second array. */
Console.Write("\n\nThe elements copied into the second array are :\n");
for(i=0; i<n; i++)
Console.Write("{0} ", arr2[i]);
Console.Write("\n\n");
12. Write a program in C# Sharp to input a string and print it
using System;
public class Exercise1
{
public static void Main()
string str;
Console.Write("\n\nAccept a string from keyboard :\n");
Console.Write("-----------------------------------\n");
Console.Write("Input the string : ");
str= Console.ReadLine();
Console.Write("The string you entered is : {0}\n", str);
13. Write a program in C# Sharp to find the length of a string
without using library function.
using System;
public class Exercise2
public static void Main()
string str; /* Declares a string of size 100 */
int l= 0;
Console.Write("\n\nFind the length of a string :\n");
Console.Write("---------------------------------\n");
Console.Write("Input the string : ");
str = Console.ReadLine();
foreach(char chr in str)
{
l += 1;
Console.Write("Length of the string is : {0}\n\n", l);
14. Write a program in C# Sharp to create a user define function
using System;
class funcexer1
public static void welcome()
Console.WriteLine("Welcome Friends!");
public static void HaveAnice()
Console.WriteLine("Have a nice day!");
public static void Main()
Console.Write("\n\nSee, how to create an user define function :\n");
Console.Write("------------------------------------------------\n");
welcome();
HaveAnice();
Console.Write("\n");
}
15. Write a program in C# Sharp to find the factorial of a given
number using recursion
using System;
class RecExercise9
static void Main(string[] args)
Console.WriteLine("\n\n Recursion : Find the factorial
of a given number :");
Console.WriteLine("-------------------------------------------------------");
Console.Write(" Input any positive number : ");
int n1 = Convert.ToInt32(Console.ReadLine());
long fact = FactorialCalcu(n1);
Console.WriteLine(" The factorial of {0} is : {1} ", n1, fact);
Console.ReadKey();
private static long FactorialCalcu(int n1)
if (n1 == 0)
return 1;
return n1 * FactorialCalcu(n1-1);
}
16. Write a program in C# Sharp to find the Fibonacci numbers
for a n numbers of series using recursion.
using System;
class RecExercise10
public static int FindFibonacci(int n)
int p = 0;
int q = 1;
for (int i = 0; i < n; i++)
int temp = p;
p = q;
q = temp + q;
return p;
static void Main()
Console.WriteLine("\n\n Recursion : Find the Fibonacci numbers for a n
numbers of series :");
Console.WriteLine("-----------------------------------------------------------
------------");
Console.Write(" Input number of terms for the Fibonacci series
: ");
int n1 = Convert.ToInt32(Console.ReadLine());
Console.Write("\n The Fibonacci series of {0} terms is : ",n1);
for (int i = 0; i < n1; i++)
Console.Write("{0} ",FindFibonacci(i));
Console.ReadKey();
17. Write a C# Sharp program to extract the Date property and
display the DateTime value in the formatted output.
using System;
public class Example1
public static void Main()
DateTime dt1 = new DateTime(2016, 6, 8, 11, 49, 0);
Console.WriteLine("Complete date: "+dt1.ToString());
// Get date-only portion of date, without its time.
DateTime dateOnly = dt1.Date;
Console.WriteLine("Short Date: "+dateOnly.ToString("d"));
Console.WriteLine("Display date using 24-hour clock format:");
Console.WriteLine(dateOnly.ToString("g"));
Console.WriteLine(dateOnly.ToString("MM/dd/yyyy HH:mm"));
18. Write a program in C# Sharp to remove a file from the disk.
using System;
using System.IO;
using System.Text;
class filexercise1
public static void Main()
string fileName = @"mytest.txt";
Console.Write("\n\n Remove a file from the disk (at
first create the file ) :\n");
Console.Write("--------------------------------------------------------------\
n");
// Delete the file if it exists.
if (File.Exists(fileName))
File.Delete(fileName);
Console.WriteLine(" The file {0} deleted
successfully.\n\n",fileName);
else
Console.WriteLine(" File does not exist");
Console.ReadKey();
19. Write a program in C# Sharp to create a file with text and
read the file.
using System;
using System.IO;
using System.Text;
class filexercise3
public static void Main()
string fileName = @"mytest.txt";
try
// Delete the file if it exists.
if (File.Exists(fileName))
File.Delete(fileName);
Console.Write("\n\n Create a file with text and read
the file :\n");
Console.Write("-------------------------------------------------\n");
// Create the file.
using (StreamWriter fileStr = File.CreateText(fileName))
{
fileStr.WriteLine(" Hello and Welcome");
fileStr.WriteLine(" It is the first content");
fileStr.WriteLine(" of the text file mytest.txt");
using (StreamReader sr = File.OpenText(fileName))
string s = "";
Console.WriteLine(" Here is the content of the
file mytest.txt : ");
while ((s = sr.ReadLine()) != null)
Console.WriteLine(s);
Console.WriteLine("");
catch (Exception MyExcep)
Console.WriteLine(MyExcep.ToString());
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