Recap:

• Console.ReadLine() statement can be used for taking input from the user, in the form of a string;
• Every built-in data type has a Parse method. It can be used for extracting data of that type from a string;
• Giving a value of a very big magnitude (can be positive or negative) for int.Parse will crash the program. This happens because int has a limited capacity, and if the number is bigger than that capacity, the program doesn't know what to do, so it crashes. In cases where values of big magnitude are expected, using long.Parse is preferable;
• Using float.Parse when dealing with very precise values can potentially cause loss of data because float has a limited precision, and parsing a very precise value will cause the program to round off the input - therefore causing some loss of precision/data. It is preferable to use double.Parse in such cases;
• A character can be parsed from a string using the char.Parse() method. It can also be parsed via indexing as well. So using Console.ReadLine()[0] is a shorter way of writing char.Parse(Console.ReadLine()).