04 | variable lvalue and rvalue in C Programming Language Tutorials
This tutorial is for clearing the variable defination,declaration , lvalue , rvalue concept in c language. Also some important interview questions.
Answer 1: Option B
Explanation:
extern int fun(); declaration in C is to indicate the existence of a global function and it is defined externally to the current module or in another file.
int fun(); declaration in C is to indicate the existence of a function inside the current module or in the same file.
Answer 2: Option A
Explanation:
Declaring is the way a programmer tells the compiler to expect a particular type, be it a variable, class/struct/union type, a function type (prototype) or a particular object instance. (ie. extern int i)
Declaration never reserves any space for the variable or instance in the program's memory; it simply a "hint" to the compiler that a use of the variable or instance is expected in the program. This hinting is technically called "forward reference".
Answer 3: Option C
Explanation:
extern int x; - is an external variable declaration.
double pow(double, double); - is a function prototype declaration.
Therefore, 1 and 3 are declarations. 2 is definition.
Answer 4: Option A
Explanation:
- During declaration we tell the datatype of the Variable.
- During definition the value is initialized.
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Please watch: "(5) 5 | Auto, Register, Static, Extern storage classes in C Programming Language Tutorials "
• 5 | Auto, Register, Static, Extern st...
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