C Programming - Declarations and Initializations - Discussion

Discussion Forum : Declarations and Initializations - General Questions (Q.No. 8)
8.
Is the following statement a declaration or definition?
extern int i;
Declaration
Definition
Function
Error
Answer: Option
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".

Discussion:
38 comments Page 1 of 4.

Hema said:   5 years ago
Give me clear information of extern.
(1)

Hiral said:   9 years ago
What is difference between declaration, definition and initialization? Please help.

Shalini said:   1 decade ago
@Geetha int i is a declaration
i=10 is a definition.
int i=10 is a definition.

Studinstru said:   1 decade ago
What about static int a;.

As static int means its default value is consider as 0/zero only.

Then above statement is declaration or definition ?

This variable is stored in BSS section of memory.

Kernel make this variable as zero before program execution for arithmetic purpose.

BINDU said:   1 decade ago
What is the difference between declaration and definition ? please explain with examples?

Ragaveni said:   1 decade ago
If only name of variable or function is provided then it is declaration.

If a value is provided to variable and body is provided to function it is definition(same as common english word).

//variable
int i;//declaring
i=5;//defining
//method
void sum();//declaring
void sum()//defining
{
int a,b
printf("%f",a+b);
}

RONAK said:   1 decade ago
Can we change the static value like :

int i=10;
static int x=i;

What is output please explain this?

Niranjan said:   1 decade ago
@Ronak. error, we can't use static int x = i;

But we can use static int x = 10; or after declaring x use x = i;

Pranali said:   1 decade ago
For the word INDIRA how it can be char[7]?

Fajlurrahman said:   1 decade ago
@Pranali.

If the INDIRA is string then char[7]since INDIRA is string so we have to store extra memory location for null character.


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