Storage Classes in C++ Assignment Help
Storage classes are defined to classify the scope and lifetime of the variables. Allocation of storage is defined for variables and way of variable can be treated by the compiler will depends on these storage classes. To define a variable, apart from the data type storage classes are required. Storage classNamehave not used till now, but the default storage classNameis playing its role. The default storage classNameis Auto. These storage classes are divided into different types
- Static Storage className
- Extern Storage className
- Auto Storage className
- Mutable Storage className
- Register Storage className
The auto Storage className
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This auto storage classNameis default storage classNamethat is used or the compiler is automatically assigning to the variables. The variables are visible within the function that is declared and terminated as soon as the function execution gets is over. If the value is not assigned then the variables having "auto" as their storage classNamehas the garbage value. The keyword used for storage classNameis "auto".
Example:
The register Storage className
The register storage classNameis the classNameused to differentiate local variables which is stored in the CPU register instead of RAM (primary memory). The register storage classNameregister is used only for those quick access variables such as counters. The variable declared within the register will always be stored in the CPU register that depends on hardware implementation. For declaring register variables "register" keyword is used
Example:
The static Storage className
The scope of a static variable is defining the local function it will not get terminated when the function execution gets over. In other words, the static storage classNamecompiled to keep the local variable in existence during the lifetime of the program instead of destroying when the function scope ends. The value of the static variable persists in between the function calls. By default. The initial value of the static variable stores as zero (0). The static modifier is also applied to global variables.
Example:
static int var3 = 6;
The extern Storage className
The global scope of the extern storage classNameis the variables. When the programmers want a variable to be visible outside the file in which it is declared, an extern variable is used. Sharing across multiple files does not end until the program execution gets terminated.
Example:
extern int var3; // declaration of variable 'var4'
int var3; // definition of variable 'var4'
The mutable Storage className
The classNameobject is the only specifier applied to mutable storage className. The overriding of the constant member function may result in function which means a mutable member can be modified by a const member function.
