Copying file from one destination to another destination in C# using System.IO.File Class

Step 1: Import System.IO class
Step 2: Create a test file in your local system.
Step 3: Give Source and Destination Path, which should be available on your system.
Step 4: Combine Path with File name using System.IO.Path class. You can also using basic string concordinate.
Step 5: Check if Direct is exist before moving the file.
Step 6: Use File.Copy static method to move the file.

Note: If you have any queries, please write in below comment box.

C# Program to find Happy and Sad Number

Description

As per Wiki, 

Happy Number – A happy number is a number defined by the following process: Starting with any positive integer, replace thenumber by the sum of the squares of its digits, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100..

Sad Number – An unhappy number is a number that is not happy, i.e., a number such that iterating this sum-of-squared-digits map starting with never reaches the number 1. The first few unhappy numbers are 2, 3, 4, 5, 6, 8, 9, 11, 12, 14, 15, 16, 17, 18…

Program

Output

Case 1

Enter the number:
10
Happy

Case 2

Enter the number:
18
Sad