Variable and Operators programming problem quiz for PRC M3 Computer Science Class Download it here https://drive.google.com/open?id=0BygcPuqDWsNyQnZ6Qm9OYk94c0U&authuser=0

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();