Basically storage class defines the accessibity of a variable. If you specify a variable with auto storage class, then that variable can be accessed only in that function or block where it is declared. if you specify a variable with static storage class, it has the same visibily like an auto variable but it can retains it's value between function calls where as an auto variable cannot. look at this example: void main() { int i,j ;
for(j = 0; j< =2; j++) { i = fun1(); printf("%d",i); } } int fun1() { static int k =0; k = k+1; return k; } it prints 1 2 3
AUTO EXTERN STATIC are the storage classes in c++
No such thing, pick one ot the three: static int x; extern int x; int x;
A static variable in C is a variable whose value and memory allocation persists throughout the execution of the program. If the variable is declared at file scope (outside of any blocks) the static attribute means the variable is visible only to the file containing it, i.e. it can not be referenced through an extern reference in a different file.
Extern and Global are the storage space in C program. Global provides us to access the variables from anywhere inside the program only whereas Extern provides us to access the variables from outside that program, i,e., some other program.
Different from what? Storage classes are auto, register, static, extern and typedef (formally).
A storage class defines the visibility and lifetime of variables or/and functions within a C Program. There are following storage classes which can be used in a C Program: auto register static extern
AUTO EXTERN STATIC are the storage classes in c++
No such thing, pick one ot the three: static int x; extern int x; int x;
A static variable in C is a variable whose value and memory allocation persists throughout the execution of the program. If the variable is declared at file scope (outside of any blocks) the static attribute means the variable is visible only to the file containing it, i.e. it can not be referenced through an extern reference in a different file.
Extern and Global are the storage space in C program. Global provides us to access the variables from anywhere inside the program only whereas Extern provides us to access the variables from outside that program, i,e., some other program.
Different from what? Storage classes are auto, register, static, extern and typedef (formally).
Storage classes.
auto, extern, static, register, typedef (only formally)
Only global/static variables are, local variables aren't.
We don't. The auto storage class is the default storage class for all local variables and is therefore completely redundant in C. It exists for no other reason than that C evolved from B and inherited all its storage classes (auto, static, extern and register).
Can static variables be declared in a header file?You can't declare a static variable without defining it as well (this is because the storage class modifiersstatic and extern are mutually exclusive). A static variable can be defined in a header file, but this would cause each source file that included the header
In C there are four storage classes: auto, static, extern and register. These storage classes essentially define the scope or visibility of a name (a function or variable). All four are inherited from B, the language from which C evolved.The auto storage class is used to explicitly declare a non-static local variable. However, given that all non-static local variables are implicitly automatic in C, explicit use of the auto storage class is therefore redundant in C. Moreover, in C++11, explicit use of the auto storage class was dropped entirely; the auto keyword is now used for automatic type deduction in C++.The static storage class is used to explicitly declare a static local variable. In addition, all global variables and functions are implicitly static and have external linkage, but if explicitly declared static they have internal linkage only.The extern storage class is used to allow access to a name that has external linkage.The register storage class is used to define a variable that should be allocated in a CPU register rather than in working memory (RAM).