C# Error 1 Use Of Unassigned Local Variable
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Use Of Unassigned Local Variable C# Array
ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the use of unassigned local variable c# for loop 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 use of unassigned local variable c# string minute: Sign up Why compile error “Use of unassigned local variable”? up vote 27 down vote favorite 5 My code is the following int tmpCnt; if (name == "Dude") tmpCnt++; Why is there an error Use of unassigned local variable tmpCnt?
Use Of Unassigned Local Variable C# Decimal
I know I didn't explicitly initialize it but due to Default Value Table a value type is initialized with 0 anyways. The reference also reminds me: Remember that using uninitialized variables in C# is not allowed. But why do I have to do it explicitly if it's already done by default? Wouldn't it gain performance if I wouldn't have to do it? Just wondering... c# .net compiler-construction share|improve this question asked Feb 10 '12 at 18:41 theknut 59521231 Can anyone help
Use Of Unassigned Local Variable C# Struct
me with the headline? Couldn't find a fitting for this one :-S –theknut Feb 10 '12 at 18:44 I have a local struct, never initialized, compiles with no errors. Today I created a different struct, treated identically, got "uninitialized local variable error". All its members were set to a value before use, but I could not first set it to null, since it was 'just' a struct. The struct that compiled contained only ints, bools and strings. The one that gave the error also contained DateTimes. "MyStructType myStruct = new MyStructType();" killed the error. Not the first time I've been bitten by missing something a few levels down. –mickeyf Jun 2 at 19:14 add a comment| 9 Answers 9 active oldest votes up vote 55 down vote accepted Local variables aren't initialized. You have to manually initialize them. Members are initialized, for example: public class X { private int _tmpCnt; // This WILL initialize to zero ... } But local variables are not: public static void SomeMethod() { int tmpCnt; // This is not initialized and must be assigned before used. ... } So your code must be: int tmpCnt = 0; if (name == "Dude") tmpCnt++; So the long and the short of it is, members are initialized, locals are not. That is why you get the compiler error. share|improve this answer answered Feb 10 '12 at 18:45 James Michael Hare 25.2k55168 3 Thanks! Didn't know about the difference on membe
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Use Of Unassigned Local Variable C# List
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 use of unassigned local variable c# try catch them; 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: http://stackoverflow.com/questions/9233000/why-compile-error-use-of-unassigned-local-variable MyClass c; try { throw new Exception(); } catch (Exception) { } c.MyProperty = 2; // "Use of unassigned local variable 'c'". 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 http://stackoverflow.com/questions/6213113/fixing-the-use-of-unassigned-local-variable-with-a-null-assignment-why 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 because you know better than him so he should not complain about this. This is probably due to the fact that assigning null is considered to imply an explicit action by the developer. share|improve this answer answered Jun 2 '11 at 10:12 Joao Angelo 30.9k57597 1 Although that made me laugh, I'm still not closer to an answer. –Andreas Grech Jun 2 '11 at 10:13 6 @Andreas: This is the actual answer, this is why it is allowed. C# will let you intentionally shoot your self in the foot. It just won't let you do it unintentionally. –Binary Worrier Jun 2 '11 at 10:17 Although the way I answered
SQL Server 2014 Express resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference https://social.msdn.microsoft.com/Forums/en-US/cf18e070-89bf-457c-96db-81a2ea2c0b27/use-of-unassigned-local-variable?forum=winforms Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Ask a question Quick access Forums home Browse forums users https://www.daniweb.com/programming/software-development/threads/417130/c-use-of-unassigned-local-variable-error FAQ Search related threads Remove From My Forums Answered by: Use of unassigned local variable Windows Forms > Windows Forms General Question 0 Sign in to vote I'm an extreme noob use of with C# - as in I took a tutorial yesterday and today I'm writing my first program. Not surprisingly I'm running into a problem. The issue is "use of unassigned local variable" and it's happening for the variables Question1 through Question5. The program consists of five questions and the user will select one of three possible answers for each. I've assigned a number use of unassigned value to each radio button and when they click the Submit button, I add those values together and assign them to varResults. Based on the value of varResults, a messagebox is shown telling you which Walking Dead character you are most like. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WalkingDeadQuiz { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { int Question1; int Question2; int Question3; int Question4; int Question5; int varResults; if (radioButton1.Checked) { Question1 = 1; } else if (radioButton2.Checked) { Question1 = 2; } else if (radioButton3.Checked) { Question1 = 3; } if (radioButton4.Checked) { Question2 = 1; } else if (radioButton5.Checked) { Question2 = 2; } else if (radioButton6.Checked) { Question2 = 3; } if (radioButto
of unassigned local variable error Donate $1 now to see this question answered quickly Sponsored questions offer a monetary incentive to answerers to produce quality responses. Be intelligently matched with 5 likely answerers who will be alerted to help. 2Contributors 1Reply 7Views 4 YearsDiscussion Span 4 Years Ago Last Post by Mitja Bonca 0 4 Years Ago to anyone I am currently writing this C# program for a C# class I am taking and I have the correct formula which is Future Value=PresentValue*(1=Rate)Year the issue I am having is there is an error message for the futureValue= presentValue, the presentValue has the message Use of unassigned local variable 'presentValue' and I did declare it in the beginning using double presentValue and its still giving me that message how do I fix this problem. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace Future_Value_List_view { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { double rate, year, presentValue, futureValue; string lineOutput; listBox1.Items.Add("Rate/Year 5 10 15 20"); for (rate = 0.03; rate <= .05; rate += .005) { lineOutput = rate.ToString("p2"); for (year = 5; year <=20; year +=5) { futureValue = presentValue * Math.Pow(1 + rate, year); lineOutput = lineOutput + " " + futureValue.ToString("C"); } listBox1.Items.Add(lineOutput); } rate.ToString("p"); } } } ipodtrip 3 posts since Feb 2012 Newbie Member c# 0 Mitja Bonca 557 4 Years Ago When you instanitate new variables, specify their beggining values, like: //instead of: double rate, year, presentValue, futureValue; //do: double rate = 0, year = 0, presentValue = 0, futureValue = 0; This article has been dead for over six months. Start a new discussion instead. Message Insert Code Snippet Alt+I Code Inline Code Link H1 H2 Preview Submit your Reply Alt+S Related Articles c# Global Variable 6 replies I'm new to c# programming, and I am a little stuck on how to make a variable available across multiple forms. I read that i … delete all files and folders in a directory but leave the directory