The set of all global variables is known as the global environment or global state. Variable shadowing in computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope Data segment 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.
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A third way is by declaring and defining a variable as being constant
A global variable or static variable can be declared (or a symbol defined in assembly) with a keyword qualifier such as const, constexpr, constant, or final, meaning that its value will be set at compile time and should not be changeable at runtime.
The most common variable types in c++ are local variables inside a function or block, and temporary variables [6] the common feature about automatic variables is that they have a lifetime that is limited to the scope of the variable. A static variable is also known as global variable, it is bound to a memory cell before execution begins and remains to the same memory cell until termination A typical example is the static variables in c and c++.
Singletons are often preferred to global variables because they do not pollute the global namespace (or their containing namespace) Additionally, they permit lazy allocation and initialization, whereas global variables in many languages will always consume resources [1][3] the singleton pattern can also be used as a basis for other design patterns, such as the abstract factory, factory.
