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  • Question
  • What will be the output of the program?
    #include<stdio.h>
    #define SQR(x)(x*x)
    
    int main()
    {
        int a, b=3;
        a = SQR(b+2);
        printf("%d\n", a);
        return 0;
    }
    


  • Options
  • A. 25
  • B. 11
  • C. Error
  • D. Garbage value

  • Correct Answer
  • 11 

    Explanation
    The macro function SQR(x)(x*x) calculate the square of the given number 'x'. (Eg: 102)

    Step 1: int a, b=3; Here the variable a, b are declared as an integer type and the variable b is initialized to 3.

    Step 2: a = SQR(b+2); becomes,

    => a = b+2 * b+2; Here SQR(x) is replaced by macro to x*x .

    => a = 3+2 * 3+2;

    => a = 3 + 6 + 2;

    => a = 11;

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

    Hence the output of the program is 11


    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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