Convert.ToInt32(Readline()) gives error when a character is entered

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Hi, Look at the Following code

C#

char c = 'a';
a=Convert.ToInt32(c);
Console.WriteLine("hi" + a);//displays output:- Hi97
a=Convert.ToInt32(Console.ReadLine());//Gives complie time error(throws an exception) if I enter 'a'(a only without quotes) on screen.

Why the Convert.ToInt32() is behaving differently in 2 situations.

Posted 6-Dec-11 6:04am

manish.netbug

Updated 6-Dec-11 6:06am

Wendelius

v2

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3 solutions

Solution 3

Because the equivalent of 'a' in ASCII character set is 97. Using Int32.TryParse method would be better in this case. See the link for your reference:
http://msdn.microsoft.com/en-us/library/f02979c7.aspx[^]

Regards,
Eduard

Posted 6-Dec-11 14:49pm

Eduard Lu

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Wendelius · Accepted Answer · 2011-12-06T06:10:00

Solution 1

In the first case you have defined a single character which is converted to ascii value (97) when added to the string.

When you use Console.ReadLine() method, the method doesn't return a character but a string. So this string cannot be converted to integer if it contains characters.

Posted 6-Dec-11 6:10am

Wendelius

Richard MacCutchan · Accepted Answer · 2011-12-06T06:13:00

Solution 2

See the documentation[^] for this and other situations.

Posted 6-Dec-11 6:13am

Richard MacCutchan