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Home ‣ C Programming ‣ Declarations and Initializations See What Others Are Saying!
  • Question

  • 1 : typedef long a;
    extern int a c;
    2 : typedef long a;
    extern a int c;
    3 : typedef long a;
    extern a c;


  • Options
  • A. 1 correct
  • B. 2 correct
  • C. 3 correct
  • D. 1, 2, 3 are correct

  • Correct Answer
  • 3 correct 

    Explanation
    typedef long a;
    extern int a c;     while compiling this statement becomes extern int long c;. This will result in to "Declaration syntax error".

    typedef long a;
    extern a int c;     while compiling this statement becomes extern long int c;. This will result in to "Too many types in declaration error".

    typedef long a;
    extern a c;     while compiling this statement becomes extern long c;. This is a valid c declaration statement. It says variable c is long data type and defined in some other file or module.

    So, Option C is the correct answer.

    More questions

    • 1. 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
    • 2. Bitwise can be used to generate a random number.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. 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
    • 4. Bitwise & can be used to check if more than one bit in a number is on.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. It is necessary that a header files should have a .h extension?

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 7. Bitwise | can be used to set multiple bits in number.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 8. Bitwise & can be used to check if a bit in number is set or not.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. A pointer union CANNOT be created

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. What will be the output of the program? 
      #include<stdio.h>
#include<stdlib.h>

int main()
{
    union test
    {
        int i;
        float f;
        char c;
    };
    union test *t;
    t = (union test *)malloc(sizeof(union test));
    t->f = 10.10f;
    printf("%f", t->f);
    return 0;
}

    • Options
    • A. 10
    • B. Garbage value
    • C. 10.100000
    • D. Error
      • Discuss

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