Outputs or errors of given simple program with explanation (26 to 30)

26)        main()

{

clrscr();

}

clrscr();

           

Answer:

No output/error

Explanation:

The first clrscr() occurs inside a function. So it becomes a function call. In the second clrscr(); is a function declaration (because it is not inside any function).

27)        enum colors {BLACK,BLUE,GREEN}

 main()

{

 

 printf("%d..%d..%d",BLACK,BLUE,GREEN);

  

 return(1);

}

Answer:

0..1..2

Explanation:

enum assigns numbers starting from 0, if not explicitly defined.

28)        void main()

{

 char far *farther,*farthest;

 

 printf("%d..%d",sizeof(farther),sizeof(farthest));

  

 }

Answer:

4..2 

Explanation:

            the second pointer is of char type and not a far pointer

29)        main()

{

 int i=400,j=300;

 printf("%d..%d");

}

Answer:

400..300

Explanation:

printf takes the values of the first two assignments of the program. Any number of printf's may be given. All of them take only the first two values. If more number of assignments given in the program,then printf will take garbage values.

30)        main()

{

 char *p;

 p="Hello";

 printf("%c\n",*&*p);

}

Answer:

H

Explanation:

* is a dereference operator & is a reference  operator. They can be    applied any number of times provided it is meaningful. Here  p points to  the first character in the string "Hello". *p dereferences it and so its value is H. Again  & references it to an address and * dereferences it to the value H.