variable-declaration

I have looked over numerous tutorials, manuals and documentations, but I still can not get this to work. I am trying to create a stored procedure using phpMyAdmin. I cant seem to find the errors here, the sql errors are so vague... CREATE PROCEDURE insertToonOneShot(IN locale CHAR(2), IN name VARCHAR(16), IN realm VARCHAR(24), IN faction CHAR(1), IN toon_level INT, IN class_name INT) BEGIN DECLARE @realmID INT; DECLARE @classID INT; DECLARE @toonID INT; SET @realmID = SELECT id FROM realms WHERE realms.name = realm; SET @classID = SELECT id FROM classes WHERE classes.name = class_name; IF NOT

What is the difference between declaring an ivar within an @interface versus putting a variable within an @implementation in a .m file? @interface MyClass : NSObject { int num; } - (void)doSomething; @end vs. @implementation MyClass int num2; - (void)doSomething { num = 137; num2 = 138; } @end Is there ever a time when you want to put a variable within the @implementation ? The difference between using an ivar and declaring a variable inside the implementation is that the variable within the implementation is at file scope and global. That means all instances (and any static methods) will

You cannot declare a void variable: void fn() { void a; // ill-formed } Yet this compiles: void fn() { void(); // a void object? } What does void() mean? How is it useful? Why is void a; ill-formed, while void() OK? void fn() { void a = void(); // ill-formed } The statement void(); creates a void value and then discards it. (You can't actually do much with a void value other than discard it or return it.) The standard † says in 5.2.3 [expr.type.conv The expression T(), where T is a simple-type-specifier or typename-specifier for a non-array complete object type or the (possibly cv-qualified)

I do have a question on variable re-declaration in loops. Why declaring an object in a foor loop doesn't trigger the redeclaration error? Do the object get destroyed and recreated at each iteration of the loop? I'm inserting a sample code class DataBlock { int id; string data; public: DataBlock(int tid=0,const string &tdata=""){ id=tid; data=tdata; } } int main(int argc, char *argv[]){ ifstream file; int temp_id; //temporary hold the the id read from the file string temp_data; //temporary hold the data read from the file set <DataBlock> s; //check for command line input here file.open(argv[1])

Does the C11 standard (note I don't mean C++11) allow you to declare variables at any place in a function? The code below is not valid in ANSI C (C89, C90): int main() { printf("Hello world!"); int a = 5; /* Error: all variables should be declared at the beginning of the function. */ return 0; } Is it valid source code in C11? Yes. This was already valid in C99 (see the second bullet here ). More or less. C99 introduced the ability to declare variables part way through a block and in the first section of a for loop, and C2011 has continued that. void c99_or_later(int n, int *x) { for (int i =

In VBA, can I Dim multiple objects as Integers in a single line in this concise fashion, or does this declare only d be an Integer? Dim a, b, c, d As Integer You can test: Sub test() Dim a, b, c, d As Integer Debug.Print TypeName(a) Debug.Print TypeName(b) Debug.Print TypeName(c) Debug.Print TypeName(d) End Sub The output in the immediate window: Empty Empty Empty Integer The empty might be slightly confusing, but it makes it clear that only the last is an integer. Using F8 to step though the code, while viewing the results in the Locals Window is even more informative since then the types of

What's the meaning of the asterisk (*) and the number, after the variable declaration? As seen in WpName As String * 6 Public Type WayPoint WpIndex As Integer WpName As String * 6 WpLat As Double WpLon As Double WpLatDir As String * 1 WpLonDir As String * 1 End Type Luke Girvin The asterisk declares the variable as a fixed-length string, where the number indicates the length of the string: http://www.1sayfa.com/1024/diger/vb/ch07.htm#Heading8 The declaration of a fixed-length string variable contains an asterisk (*) to tell Visual Basic that the string will be a fixed length. The final