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Home C Programming Expressions See What Others Are Saying!
  • Question
  • Assuming, integer is 2 byte, What will be the output of the program?
    #include<stdio.h>
    
    int main()
    {
        printf("%x\n", -2<<2);
        return 0;
    }
    


  • Options
  • A. ffff
  • B. 0  
  • C. fff8
  • D. Error

  • Correct Answer
  • fff8 

    Explanation
    The integer value 2 is represented as 00000000 00000010 in binary system.

    Negative numbers are represented in 2's complement method.

    1's complement of 00000000 00000010 is 11111111 11111101 (Change all 0s to 1 and 1s to 0).

    2's complement of 00000000 00000010 is 11111111 11111110 (Add 1 to 1's complement to obtain the 2's complement value).

    Therefore, in binary we represent -2 as: 11111111 11111110.

    After left shifting it by 2 bits we obtain: 11111111 11111000, and it is equal to "fff8" in hexadecimal system.

  • More questions

    • 1. Bitwise | can be used to set a bit in number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 2. Can we have an array of bit fields?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 3. By default structure variable will be of auto storage class

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 4. Bitwise can be used to reverse a sign of a number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 5. Is it necessary that in a function which accepts variable argument list there should be at least be one fixed argument?

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 6. Bitwise can be used to generate a random number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 7. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Bitwise & can be used to check if more than one bit in a number is on.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. It is necessary that a header files should have a .h extension?

    • Options
    • A. Yes
    • B. No
    • Discuss


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