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  • Question
  • What will be the output of the program?
    #include<stdio.h>
    int main()
    {
        int x = 10, y = 20;
        if(!(!x) && x)
            printf("x = %d\n", x);
        else
            printf("y = %d\n", y);
        return 0;
    }
    


  • Options
  • A. y =20
  • B. x = 0
  • C. x = 10
  • D. x = 1

  • Correct Answer
  • x = 10 

    Explanation
    The logical not operator takes expression and evaluates to true if the expression is false and evaluates to false if the expression is true. In other words it reverses the value of the expression.

    Step 1: if(!(!x) && x)
    Step 2: if(!(!10) && 10)
    Step 3: if(!(0) && 10)
    Step 3: if(1 && 10)
    Step 4: if(TRUE) here the if condition is satisfied. Hence it prints x = 10.


    More questions

    • 1. Bitwise can be used to reverse a sign of a number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 2. 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
    • 3. Bitwise can be used to generate a random number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 4. 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
    • 5. Bitwise & can be used to check if more than one bit in a number is on.

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

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

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 8. Bitwise | can be used to set multiple bits in number.

    • Options
    • A. Yes
    • B. No
    • Discuss
    • 9. Bitwise & can be used to check if a bit in number is set or not.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. A pointer union CANNOT be created

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


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