How do I use the tryParse method in my program?

Question

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I wrote this program and asks a user to guess a number between 20 and 30 and to avoid the user entering something like a letter, I used a certain code but I would like to know how to use the tryParse method. Could someone please put the tryParse method in my code?

C#

using System;

class ApplicationEntry
 Collapse | Copy Code
{
static void Main(string[] args)
{
bool repeat = true, repeat2 = true, repeat3 = true;
while (repeat == true)
{
repeat2 = true;
Random r = new Random();
int numb = (r.Next(20, 30));
 Collapse | Copy Code

while (repeat2 == true)
{
Console.WriteLine("Please enter a numbers between 20 and 30");
int guess1 = Convert.ToInt32(Console.ReadLine());

if ((guess1 < 20 || guess1 > 30) && guess1 != numb)
{
Console.WriteLine("Invalid. Please enter a number between 20 and 30");
repeat3 = false;
}
else if (guess1 == numb)
{
Console.WriteLine("Good job");
repeat2 = false;
repeat3 = true;
}
else
{
Console.WriteLine("Wrong! Try again");
repeat2 = true;
repeat3 = false;
}
while (repeat3 == true)
{
Console.WriteLine("Would you like to play again?");
string answer = Console.ReadLine();
if (answer == "yes" || answer == "Yes" || answer == "YES")
{
repeat3 = false;
repeat = true;
repeat2 = false;
}
else if (answer == "no" || answer == "No" || answer == "NO")
{
repeat = false;
repeat3 = false;
}
else
{
Console.WriteLine("I didn't understand that");
}


}

}
}

Console.Write("\nPress any key to exit program: ");
Console.ReadKey();
}

}

Posted 18-Mar-13 17:37pm

Yrtsg

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Hari Om Prakash Sharma · Accepted Answer · 2013-03-18T18:03:00

Instead of writing this statement

int guess1 = Convert.ToInt32(Console.ReadLine());

Try TryParse method to check invalid entries like characters, read more [^]

int guess1;
bool result = Int32.TryParse(Console.ReadLine(), out guess1);
if (result)
{
   //successfully converted into Int value        
}
else
{
   //invalid entry, try again
   //continue;
}

_Maxxx_ · Accepted Answer · 2013-03-18T18:07:00

C#

if (!int.TryParse(Console.ReadLine(), guess1)
{
     Console.WriteLine("Invalid. Please enter a number between 20 and 30");
}

So the tryParse takes the string (Console.ReadLine()) and tries to parse it to an integer, putting the result (if it succeeds) in guess1.

The function returns a boolean - false if the conversion fails -

How do I use the tryParse method in my program?

2 solutions

Solution 1

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