Part I - User Input Validation

Console.WriteLine("Please enter a positive number");
int n = int.Parse(Console.ReadLine());
while (n < 0)
{
    Console.WriteLine($"You entered {n}, I asked you for a positive number. Please try again.");
    n = int.Parse(Console.ReadLine());
}

Part II - First While Loops

1. Write a while loop that display the “*" character 100 times at the screen.

2. Modify your previous loop, so that a new line character is displayed on the screen every time 10 “*" has been displayed on the screen. That is, your program should display on the screen:

**********
**********
**********
**********
**********
**********
**********
**********
**********
**********

Part III - TryParse Method

Console.WriteLine("Please, enter an integer.");
string message = Console.ReadLine();
int a;
bool res = int.TryParse(message, out a);
if (res)
    {
        Console.WriteLine($"The value entered was an integer: {a}.");
    }
else
    {
        Console.WriteLine("The value entered was not an integer, so 0 is assigned to a.");
    }
Console.WriteLine(a);

Part IV - Pushing Further

The following are two independent tasks, to widen your understanding of this class, and to prepare you for the next labs.

1. Actually, there is a TryParse method in other classes as well: there is for instance a Double.TryParse and a Decimal.TryParse method. Write a small program that uses one of them.

2. Write a static method that takes a string as an argument, and return a boolean: true if the string given as a parameter is an integer, false otherwise. You should use TryParse in the body of your method. Note that you can define a static method in the same file as your Main method:

class Program
    {

    static bool MyMethod(string param)
    {
        // Code goes here, we just return false to avoid an error message:
        return false;
    }
    static void Main()
    {
        Console.WriteLine(MyMethod("Test"));
    }
}