good questions of c with answer

Volatile modifier keyword questions in c programming language:

(q) What will be output of the following program?

void main()

{

volatile a=5;

a=~a+ ++a;

clrscr();

printf("%d",a);

getch();

}

Output: -1

Explanation: 

Volatile variable can be modifying by interrupt or other process in preprocessor. So in normal output will not affect.

Note. ~ is one’s complement operator

(q) What will be output of the following program?

void main()

{

volatile a=5;

a=~a+++a;

clrscr();

printf("%d",a);

getch();

}

Output: 0

Explanation: 

Volatile variable can be modifying by interrupt or other process in preprocessor. So in normal output will not affect.

a+++a means a++ + a.

Note. ~ is one’s complement operator.