declaration

I want to write reusable code and need to declare some variables at the beginning and reuse them in the script, such as: DEFINE stupidvar = 'stupidvarcontent'; SELECT stupiddata FROM stupidtable WHERE stupidcolumn = &stupidvar; How can I declare a variable and reuse it in statements that follow such as in using it SQLDeveloper. Attempts Use a DECLARE section and insert the following SELECT statement in BEGIN and END; . Acces the variable using &stupidvar . Use the keyword DEFINE and access the variable. Using the keyword VARIABLE and access the the variable. But I am getting all kinds of

I recently learned the spiral rule for deobfuscating complex declarations, that must have been written with a series of typedefs. However, the following comment alarms me: A frequently cited simplification, which only works for a few simple cases. I do not find void (*signal(int, void (*fp)(int)))(int); a "simple case". Which is all the more alarming, by the way. So, my question is, in which situations will I be correct to apply the rule, and in which it would be in error? Basically speaking, the rule simply doesn't work, or else it works by redefining what is meant by spiral (in which case,

Why does this first if compile well and the second fail? if(proceed) {int i;} // This compiles fine. if(proceed) int i;// This gives an error. (Syntax error on token ")", { expected after this token) Brian Roach Because the language spec says so: http://docs.oracle.com/javase/specs/jls/se7/html/jls-6.html A declaration introduces an entity into a program and includes an identifier (§3.8) that can be used in a name to refer to this entity. A declared entity is one of the following: ... A local variable, one of the following: * A local variable declared in a block (§14.4) * A local variable

I want to declare a variable in SQLite and use it in insert operation. Like in MS SQL: declare @name as varchar(10) set name = 'name' select * from table where name = @name For example, I will need to get last_insert_row and use it in insert . I have found something about binding but I didn't really fully understood it. SQLite doesn't support native variable syntax, but you can achieve virtually the same using an in-memory temp table. I've used the below approach for large projects and works like a charm. /* Create in-memory temp table for variables */ BEGIN; PRAGMA temp_store = 2; CREATE TEMP

I've seen default used next to function declarations in a class. What does it do? class C { C(const C&) = default; C(C&&) = default; C& operator=(const C&) & = default; C& operator=(C&&) & = default; virtual ~C() { } }; It's a new C++11 feature . It means that you want to use the compiler-generated version of that function, so you don't need to specify a body. You can also use = delete to specify that you don't want the compiler to generate that function automatically. With the introduction of move constructors and move assignment operators, the rules for when automatic versions of

I heard (probably from a teacher) that one should declare all variables on top of the program/function, and that declaring new ones among the statements could cause problems. But then I was reading K&R and I came across this sentence: "Declarations of variables (including initializations) may follow the left brace that introduces any compound statement, not just the one that begins a function". He follows with an example: if (n > 0){ int i; for (i=0;i<n;i++) ... } I played a bit with the concept, and it works even with arrays. For example: int main(){ int x = 0 ; while (x<10){ if (x>5){ int y