C Preprocessor MCQs

Which of the following is not a preprocessor directive?

The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define?

The function of __attribute__((packed)); can also be performed using . . . . . . . .

The preprocessor directive which checks whether a constant expression results in a zero or non-zero value . . . . . . . .

What will be the output of the following C code?

#include<stdio.h>
void f()
{
    #define sf 100
    printf("%d",sf);
}
int main()
{
    #define sf 99;
    f();
    printf("%d",sf);
}

What will be the output of the following C code?

#define HELLO(a) #a
main()
{
    printf(HELLO(good        morning)); 
}

The purpose of the preprocessor directive #error is that . . . . . . . .

What will be the output of the following C code?

#include<stdio.h>
#define ram 10
main()
{
    #ifdef ram
    #define ram 20
    #endif
    printf("%d",ram);
}

The pragma . . . . . . . . is used to remove an identifier completely from a program.