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Home C Programming Variable Number of Arguments See What Others Are Saying!
  • Question
  • Point out the error in the following program.
    #include<stdio.h>
    #include<stdarg.h>
    fun(...);
    
    int main()
    {
        fun(3, 7, -11.2, 0.66);
        return 0;
    }
    fun(...)
    {
        va_list ptr;
        int num;
        va_start(ptr, n);
        num = va_arg(ptr, int);
        printf("%d", num);
    }
    


  • Options
  • A. Error: fun() needs return type
  • B. Error: ptr Lvalue required
  • C. Error: Invalid declaration of fun(...)
  • D. No error

  • Correct Answer
  • Error: Invalid declaration of fun(...) 

    Explanation
    There is no fixed argument in the definition fun()

  • 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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