C# Use Of Unassigned Local Variable Error
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C# Use Of Unassigned Local Variable Array
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C# Use Of Unassigned Local Variable Struct
only takes a 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 c# use of unassigned local variable if statement unassigned local variable tmpCnt? 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 c# use of unassigned local variable list theknut 59521231 Can anyone help 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 1
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C# Use Of Unassigned Local Variable Char
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Use Of Unassigned Local Variable C# For Loop
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 up C# error: Use of http://stackoverflow.com/questions/9233000/why-compile-error-use-of-unassigned-local-variable 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 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 http://stackoverflow.com/questions/256073/c-sharp-error-use-of-unassigned-local-variable 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)? Hope ya'll can give me some pointers :) Thanks. c# initialization share|improve this question edited Nov 2 '08 at 0:17 Blair Conrad 98.4k17106100 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 350k65568700 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 N
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