How Can I Validate Console Input to Ensure Only Integers Are Accepted?

Validating Console Input as Integers

When working with user input in your code, it's essential to ensure its validity to prevent errors and maintain the integrity of your program. One such scenario is validating console input to allow only integers.

In the provided code, you've defined a program that reads three integer inputs from the console:

int a = Convert.ToInt32(Console.ReadLine());
int b = Convert.ToInt32(Console.ReadLine());
int c = Convert.ToInt32(Console.ReadLine());

However, this approach potentially allows users to input non-integer values, which can cause parsing errors and unexpected behavior.

To address this, utilize the int.TryParse method. This method attempts to convert a string to an integer, returning true if successful and false otherwise. Here's a modified version of your code:

string line = Console.ReadLine();
int value;
if (int.TryParse(line, out value))
{
   // this is an int
   // do you minimum number check here
}
else
{
   // this is not an int
}

In this approach, the user's input is first read as a string into the line variable. The int.TryParse method attempts to parse the string into an int and stores the result in the value variable. If TryParse returns true, you know the input is valid and can proceed with your minimum number check logic. If it returns false, you can handle the non-integer input appropriately, such as displaying an error message or requesting a corrected input.

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