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

  • What will be the output of the program in 16 bit platform (Turbo C under DOS)? 
    #include<stdio.h>
int main()
{
    extern int i;
    i = 20;
    printf("%d\n", sizeof(i));
    return 0;
}


  • Options
  • A. 2
  • B. 4
  • C. vary from compiler
  • D. Linker Error : Undefined symbol 'i'

  • Correct Answer
  • Linker Error : Undefined symbol 'i' 

    Explanation
    Linker Error : Undefined symbol 'i'
    The statement extern int i specifies to the compiler that the memory for 'i' is allocated in some other program and that address will be given to the current program at the time of linking. But linker finds that no other variable of name 'i' is available in any other program with memory space allocated for it. Hence a linker error has occurred.

    • 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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