What is the difference between static and extern?
Storage classes are used to indicate duration and scope of a variable or identifier. Duration indicates the life span of a variable. Scope indicates the visibility of the variable. The static storage class is used to declare an identifier that is a local variable either to a function or a file and that exists and retains its value after control passes from where it was declared. This storage class has a duration that is permanent. A variable declared of this class retains its value from one call of the function to the next. The scope is local. A variable is known only by the function it is declared within or if declared globally in a file, it is known or seen only by the functions within that file. This storage class guarantees that declaration of the variable also initializes the variable to zero or all bits off. The extern storage class is used to declare a global variable that will be known to the functions in a file and capable of being known to all functions in a program. This storage class has a duration that is permanent. Any variable of this class retains its value until changed by another assignment. The scope is global. A variable can be known or seen by all functions within a program.
What is difference between global and extern storage classes?
Global is a symbol declared at file scope, outside of any blocks. It is automatically visible to other modules unless it has the static attribute. Extern, on the other hand, is the declaration of a symbol that is global in some other module, with the intent that the resolution will be made by the linker. This answer is the C and C++ answer. I do not know C#, but I believe it similar. If anyone…
What does static variable mean in c language?
there are 3 main uses for the static. 1. If you declare within a function: It retains the value between function calls 2.If it is declared for a function name: By default function is extern..so it will be visible from other files if the function declaration is as static..it is invisible for the outer files 3. Static for global variables: By default we can use the global variables from outside files If it is static…
What is difference between Static and Global variable?
Static may be local of global -local static variable is limited to the function scope. and retain it's value when function is been called . compiler differentiate static variables with a prefix function name while dealing with same name static variable in different functions. - Global static variable is visible to all the function defined in the file and retain it value but it cannot be used outside this file. now Global Variable --- this…
What is the difference between static variable and global variable declaration?
When you say static variable, do you mean local static variable or global static variable? In C, the difference between global static variables and global variables is that static in this case means that the variable can be used only in the module (.c file) that it is declared. The difference between a local static variable and a global variable is the scope: the local variable can be used only inside the function that declares…