The document is a code snippet that demonstrates how to obtain and manipulate user input in a console application, including collecting names and performing basic arithmetic operations. It showcases variable declarations, user prompts for name and number inputs, and the calculation of the sum of two numbers. Sections for calculating the difference, product, and quotient of the numbers are indicated but not completed.

1. //Declares String Variables "firstName" and "lastName"
string firstName = "John";
string lastName = "Doe";
//Writes the values of "firstName" and "lastName" on the screen
Console.WriteLine("Name:" + firstName + " " + lastName);
//Asks for new value for "firstName"
Console.WriteLine("Please enter a new first name:");
firstName = Console.ReadLine();
//Asks for new value for "firstName"
Console.WriteLine("Please enter a new last name:");
lastName = Console.ReadLine();
//Writes down the new first name
Console.WriteLine("New first name: " + firstName);
//Writes down the new last name
Console.WriteLine("New last name: " + lastName);
Console.WriteLine("Name: " + firstName + " " + lastName);
//Takes the value of a two variables "Number1" and "Number2"
Console.WriteLine("Enter a number:");
string _Number1 = Console.ReadLine();
Double Number1 = Convert.ToDouble(_Number1);
Console.WriteLine("Enter another number:");
string _Number2 = Console.ReadLine();
Double Number2 = Convert.ToDouble(_Number2);
//Add Number 1 to Number 2 and store value as a double variable "SUM"
Double SUM = Number2 + Number1;
//Print Result SUM
Console.WriteLine("The sum is " + SUM);
//Subtract Number 1 with Number 2 and store value as a double variable "DIFF"
(Insert code below)
//Print Result SUM
Console.WriteLine("The difference is " + DIFF);
//Multiply Number 1 with Number 2 and store value as a double variable "PROD"
(Insert code below)
//Print Result PROD (Insert code below)
//Divide Number 1 with Number 2 and store value as a double variable "QUOT"
(Insert code below)
//Print Result QUOT (Insert code below)
Console.WriteLine("Tap ENTER Key to close program");
Console.Read();