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

  • Is the following statement a declaration or definition?
    extern int i;


  • Options
  • A. Declaration
  • B. Definition
  • C. Function
  • D. Error

  • Correct Answer
  • Declaration 

    Explanation
    Declaring is the way a programmer tells the compiler to expect a particular type, be it a variable, class/struct/union type, a function type (prototype) or a particular object instance. (ie. extern int i)

    Declaration never reserves any space for the variable or instance in the program's memory; it simply a "hint" to the compiler that a use of the variable or instance is expected in the program. This hinting is technically called "forward reference".

    More questions

    • 1. If the binary eauivalent of 5.375 in normalised form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the program (on intel machine)? 
      #include<stdio.h>
#include<math.h>
int main()
{
    float a=5.375;
    char *p;
    int i;
    p = (char*)&a;
    for(i=0; i<=3; i++)
        printf("%02x\n", (unsigned char)p[i]);
    return 0;
}

    • Options
    • A. 40 AC 00 00
    • B. 04 CA 00 00
    • C. 00 00 AC 40
    • D. 00 00 CA 04
      • Discuss
    • 2. What will be the output of the program? 
      #include<stdio.h>
int main()
{
    int i=2;
    printf("%d, %d\n", ++i, ++i);
    return 0;
}

    • Options
    • A. 3, 4
    • B. 4, 3
    • C. 4, 4
    • D. Output may vary from compiler to compiler
      • Discuss
    • 3. What will be the output of the program? 
      #include<stdio.h>
#include<stdlib.h>

int main()
{
    char *i = "55.555";
    int result1 = 10;
    float result2 = 11.111;
    result1 = result1+atoi(i);
    result2 = result2+atof(i);
    printf("%d, %f", result1, result2);
    return 0;
}

    • Options
    • A. 55, 55.555
    • B. 66, 66.666600
    • C. 65, 66.666000
    • D. 55, 55
      • Discuss
    • 4. On left shifting, the bits from the left are rotated and brought to the right and accommodated where there is empty space on the right?

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. What is (void*)0?

    • Options
    • A. Representation of NULL pointer
    • B. Representation of void pointer
    • C. Error
    • D. None of above
      • Discuss
    • 6. Bitwise & and | are unary operators

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Point out the error in the program. 
      #include<stdio.h>
const char *fun();

int main()
{
    char *ptr = fun();
    return 0;
}
const char *fun()
{
    return "Hello";
}

    • Options
    • A. Error: Lvalue required
    • B. Error: cannot convert 'const char *' to 'char *'.
    • C. No error and No output
    • D. None of above
      • Discuss
    • 8. In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Point out the error in the following program. 
      #include<stdio.h>
#include<stdarg.h>

int main()
{
    void display(char *s, int num1, int num2, ...);
    display("Hello", 4, 2, 12.5, 13.5, 14.5, 44.0);
    return 0;
}
void display(char *s, int num1, int num2, ...)
{
    double c;
    char s;
    va_list ptr;
    va_start(ptr, s);
    c = va_arg(ptr, double);
    printf("%f", c);
}

    • Options
    • A. Error: invalid arguments in function display()
    • B. Error: too many parameters
    • C. Error: in va_start(ptr, s);
    • D. No error
      • Discuss
    • 10. Point out the error if any in the following program (Turbo C). 
      #include<stdio.h>
#include<stdarg.h>
void display(int num, ...);

int main()
{
    display(4, 'A', 'a', 'b', 'c');
    return 0;
}
void display(int num, ...)
{
    char c; int j;
    va_list ptr;
    va_start(ptr, num);
    for(j=1; j<=num; j++)
    {
        c = va_arg(ptr, char);
        printf("%c", c);
    }
}

    • Options
    • A. Error: unknown variable ptr
    • B. Error: Lvalue required for parameter
    • C. No error and print A a b c
    • D. No error and print 4 A a b c
      • Discuss

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