Error 10 Use Of Unassigned Local Variable
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Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign use of unassigned local variable string up Use of unassigned local variable up vote 1 down vote favorite I've got problem with writing a converter from hex to bin, dec to bin etc. Here's my code, when I debug it I've got an error "Use of unassigned local variable Dec_Int10", could you help me? How can I fix this error? protected void Button_Click (object sender, Event Args e) use of unassigned local variable array { if (Page.IsValid) { int Dec_Int10; if(!(string.IsNullOrEmpty(TextBox1.Text))) { Dec_Int10 = Convert.ToInt32(TextBox1.Text, 10))); } if(!(string.IsNullOrEmpty(TextBox2.Text))) { Dec_Int10 = Convert.ToInt32(TextBox2.Text, 16))); } if(!(string.IsNullOrEmpty(TextBox3.Text))) { Dec_Int10 = Convert.ToInt32(TextBox3.Text, 8))); } if(!(string.IsNullOrEmpty(TextBox4.Text))) { Dec_Int10 = Convert.ToInt32(TextBox4.Text, 2))); } string Dec_Str10 = Convert.ToString(Dec_Int10, 10); string Hex_Str16 = Convert.ToString(Dec_Int10, 16); string Oct_Str8 = Convert.ToString(Dec_Int10, 8); string Bin_Str2 = Convert.ToString(Dec_Int10, 2); TextBox1.Text = Dec_Str10; TextBox2.Text = Hex_Str16; TextBox3.Text = Oct_Str8; TextBox4.Text = Bin_Str2; } } c# asp.net .net-3.5 .net-4.0 share|improve this question edited Nov 28 '11 at 17:55 Joel Coehoorn 248k92440661 asked Nov 5 '10 at 21:27 Alliah 3623 A precise error message?!? Never! –user166390 Nov 6 '10 at 0:11 add a comment| 7 Answers 7 active oldest votes up vote 4 down vote You get that error because there is no default value assigned to the variable and since the only assignments to it are inside if blocks, the compiler thinks there is a chance the variable will never be assigned. If you just initialize it to 0 you'll no longer have the error. This is one of the checks provided by the compiler to keep you from making ea
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other. Join them; it only takes a minute: Sign up C# error: Use of unassigned local variable up vote 22 down vote favorite 1 I'm not sure why I'm getting this error, but shouldn't this code compile, since I'm http://stackoverflow.com/questions/4110251/use-of-unassigned-local-variable already checking to see if queue is getting initialized? public static void Main(String[] args) { Byte maxSize; Queue queue; if(args.Length != 0) { if(Byte.TryParse(args[0], out maxSize)) queue = new Queue(){MaxSize = maxSize}; else Environment.Exit(0); } else { Environment.Exit(0); } for(Byte j = 0; j < queue.MaxSize; j++) queue.Insert(j); for(Byte j = 0; j < queue.MaxSize; j++) Console.WriteLine(queue.Remove()); } So if queue is not initialized, then the for loops aren't reachable right? Since the program already terminates with Environment.Exit(0)? http://stackoverflow.com/questions/256073/c-sharp-error-use-of-unassigned-local-variable Hope ya'll can give me some pointers :) Thanks. c# initialization share|improve this question edited Nov 2 '08 at 0:17 Blair Conrad 98.6k17106100 asked Nov 1 '08 at 20:33 jkidv 1,11131212 6 I can't give you any pointers, but I hope you can get a handle on this one. –wprl Nov 1 '08 at 20:40 add a comment| 5 Answers 5 active oldest votes up vote 65 down vote accepted The compiler doesn't know that the Environment.Exit() is going to terminate the program; it just sees you executing a static method on a class. Just initialize queue to null when you declare it. Queue queue = null; share|improve this answer edited Mar 9 '13 at 1:14 Zaid Masud 7,20634369 answered Nov 1 '08 at 20:35 tvanfosson 351k65570700 add a comment| up vote 9 down vote The compiler doesn't know that Environment.Exit() does not return. Why not just "return" from Main()? share|improve this answer answered Nov 1 '08 at 20:35 Brian 95.3k11188265 I prefer to use Environment.Exit with a non-zero error status in case the program is called from a script. That way the script can know whether the program was successful or not by checking the exit status. –tvanfosson Nov 1 '08 at 20:51 4 Change the return type of main to int and return the status. –Scott Langham Dec 5 '08 at 1:18 add a comment|
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings http://stackoverflow.com/questions/6213113/fixing-the-use-of-unassigned-local-variable-with-a-null-assignment-why and policies of this site About Us Learn more about Stack Overflow http://www.c-sharpcorner.com/forums/why-is-the-error-use-of-unassigned-local-variable the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; use of it only takes a minute: Sign up Fixing the 'Use of unassigned local variable' with a null assignment. Why? up vote 17 down vote favorite 1 With a piece of code like this, the compiler complains on c.MyProperty: MyClass c; try { throw new Exception(); } catch (Exception) { } c.MyProperty = 2; // "Use of unassigned local variable 'c'". use of unassigned Yet it doesn't complain if you assign a null to c in initialization: MyClass c = null; try { throw new Exception(); } catch (Exception) { } c.MyProperty = 2; // no complains this time. So, why does this work? If c wasn't assigned a null and the compiler hypothetically allowed it, wouldn't the same exception be thrown at c.MyProperty, Object reference not set to an instance of an object? c# exception variable-assignment share|improve this question asked Jun 2 '11 at 10:10 Andreas Grech 51.9k81248326 Hmm, that is interesting, my guess would be though that this code (second version) would still throw an exception at Runtime.. it's likely just a visual studio issue that is not picking up the null assignment - Just a guess ? –Dave Long Jun 2 '11 at 10:13 1 Take a look to stackoverflow.com/questions/4770426/… –Haplo Jun 2 '11 at 10:17 add a comment| 4 Answers 4 active oldest votes up vote 37 down vote accepted When you assign null to the variable you're telling the compiler to back off
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