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In C, variables with static storage duration that are not initialized explicitly are initialized to zero (or null, for pointers). [3] Not only are uninitialized variables a frequent cause of bugs, but this kind of bug is particularly serious because it may not be reproducible: for instance, a variable may remain uninitialized only in some ...
Check that the variable is initialized (without obtaining the lock). If it is initialized, return it immediately. Obtain the lock. Double-check whether the variable has already been initialized: if another thread acquired the lock first, it may have already done the initialization. If so, return the initialized variable.
In computing, a data segment (often denoted .data) is a portion of an object file or the corresponding address space of a program that contains initialized static variables, that is, global variables and static local variables. The size of this segment is determined by the size of the values in the program's source code, and does not change at ...
In Perl, local variables are declared using the my operator. Uninitialized scalars will have the value undef; uninitialized arrays or hashes will be (). [5] Perl also has a local operator that does not create automatic variables, [6] instead giving global (package) variables a temporary value, which is dynamically scoped to the enclosing block ...
In computer programming, initialization or initialisation is the assignment of an initial value for a data object or variable. The manner in which initialization is performed depends on the programming language, as well as the type, storage class, etc., of an object to be initialized.
increment local variable #index by signed byte const: iload 15 0001 0101 1: index → value load an int value from a local variable #index: iload_0 1a 0001 1010 → value load an int value from local variable 0 iload_1 1b 0001 1011 → value load an int value from local variable 1 iload_2 1c 0001 1100 → value load an int value from local ...
Local variables may have a lexical or dynamic scope, though lexical (static) scoping is far more common.In lexical scoping (or lexical scope; also called static scoping or static scope), if a variable name's scope is a certain block, then its scope is the program text of the block definition: within that block's text, the variable name exists, and is bound to the variable's value, but outside ...
If the initialization is not done explicitly, external (static or not) and local static variables are initialized to zero. Local automatic variables are uninitialized, i.e. contain "trash" values. The static keyword applied to a function definition changes the linkage of the function so that it is only visible from the translation unit where ...