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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>
    
    int main()
    {
        void display(int num, ...);
        display(4, 12.5, 13.5, 14.5, 44.3);
        return 0;
    }
    void display(int num, ...)
    {
        float c; int j;
        va_list ptr;
        va_start(ptr, num);
        for(j=1; j<=num; j++)
        {
            c = va_arg(ptr, float);
            printf("%f", c);
        }
    }
    


  • Options
  • A. Error: invalid va_list declaration
  • B. Error: var c data type mismatch
  • C. No error
  • D. No error and Nothing will print

  • Correct Answer
  • Error: var c data type mismatch 

    Explanation
    Use double instead of float in float c;

  • 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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