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  • Question
  • What will be the output of the program?
    #include<stdio.h>
    #define CUBE(x) (x*x*x)
    
    int main()
    {
        int a, b=3;
        a = CUBE(b++);
        printf("%d, %d\n", a, b);
        return 0;
    }
    


  • Options
  • A. 9, 4
  • B. 27, 4
  • C. 27, 6
  • D. Error

  • Correct Answer
  • 27, 6 

    Explanation
    The macro function CUBE(x) (x*x*x) calculates the cubic value of given number(Eg: 103.)

    Step 1: int a, b=3; The variable a and b are declared as an integer type and varaible b id initialized to 3.

    Step 2: a = CUBE(b++); becomes

    => a = b++ * b++ * b++;

    => a = 3 * 3 * 3; Here we are using post-increement operator, so the 3 is not incremented in this statement.

    => a = 27; Here, 27 is store in the variable a. By the way, the value of variable b is incremented by 3. (ie: b=6)

    Step 3: printf("%d, %d\n", a, b); It prints the value of variable a and b.

    Hence the output of the program is 27, 6.


    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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