using System;
using System.Collections.Generic;
using System.Linq;
class MainClass {
static void Main() {
// declaring and initializing valid variables
int age = 25;
float distance = 9.81f;
double speed = 19.99999;
decimal balance = 1000.50m;
bool isActive = true;
char letter = 'A';
string name = "John";
// declare a variable and then assign it
string greeting;
greeting = "Hello";
// invalid variable name (this will produce an error)
// remeber variables cannot start with a number
// erase the 1 to make it work
string 1day = "Monday";
// you can reassign a variable as many times as you'd like
greeting = "Hello, how are you";
// write the greeting to stdout (standard output)
Console.WriteLine(greeting);
}
}
