c_programming

Question

#include "stdio.h"

 int * gPtr;

int main()
{
int * lPtr = NULL;

if(gPtr == lPtr)
{
printf("Equal!");
}
else
{
printf("Not Equal");
}

return 0;
}

what will be the outpout :

A.> it will always print equal

B> it will always print Not equal

C>Since gPtr isn’t initialized in the program, it’ll print sometimes Equal and at other times Not Equal.

Comments

@saxena0612

yeah ! I did :)

Thank you

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@saxena0612

Any resources for your this statement.

"when you point pointer to NULL then it means that it is pointing to the memory address 0x0." (Always)

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According to C Standard Document section 6.3.2.3:

An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant.55) If a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function.

Answer 1

Ans is A.

Global variables (pointers or data members) are always assigned a default value at compilation. Hence the default value for gPtr is NULL.

Answer 2

Global variables are by default NULL and the ASCII value of NULL is 0.So 0=0 is true hence output would be EQUAL!