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  • Question
  • What will be the output of the program?
    #include<stdio.h>
    int main()
    {
        int x=4, y, z;
        y = --x;
        z = x--;
        printf("%d, %d, %d\n", x, y, z);
        return 0;
    }
    


  • Options
  • A. 4, 3, 3
  • B. 4, 3, 2
  • C. 3, 3, 2
  • D. 2, 3, 3

  • Correct Answer
  • 2, 3, 3 

    Explanation
    Step 1: int x=4, y, z; here variable x, y, z are declared as an integer type and variable x is initialized to 4.
    Step 2: y = --x; becomes y = 3; because (--x) is pre-decrement operator.
    Step 3: z = x--; becomes z = 3;. In the next step variable x becomes 2, because (x--) is post-decrement operator.
    Step 4: printf("%d, %d, %d\n", x, y, z); Hence it prints "2, 3, 3".

    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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