Questions and answers for exam Preparation

MCQs

Total Questions : 66 | Page 2 of 7 pages

Question 11.

A float is 4 bytes wide, whereas a double is 8 bytes wide.

True
False

Discuss Question

Answer: Option A. -> True

True,
float = 4 bytes.
double = 8 bytes.

Question 12.

1 : typedef long a;
extern int a c;

2 : typedef long a;
extern a int c;

3 : typedef long a;
extern a c;

1 correct
2 correct
3 correct
1, 2, 3 are correct

Discuss Question

Answer: Option C. -> 3 correct

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.

Question 13.

A long double can be used if range of a double is not enough to accommodate a real number.

True
False

Discuss Question

Answer: Option A. -> True

True, we can use long double; if double range is not enough.

double = 8 bytes.
long double = 10 bytes.

Question 14.

Which of the structure is correct?
1:

struct book
{
char name[10];
float price;
int pages;
};
2 :

struct aa
{
char name[10];
float price;
int pages;
};
3 :

struct aa
{
char name[10];
float price;
int pages;
};

1
2
3
All of above

Discuss Question

Answer: Option A. -> 1

In 2 and 3 semicolon are missing in structure element.

Question 15.

Which of the structure is incorrcet?
1:

struct aa
{
int a;
float b;
};
2:

struct aa
{
int aa;
float b;
struct aa var;
};
3:

struct aa
{
int a;
float b;
struct aa *var;
};

1
2
3
1, 2, 3

Discuss Question

Answer: Option B. -> 2

Option B gives "Undefined structure in 'aa'" error.

Question 16.

Which of the following correctly represents a long double constant?

6.68
6.68L
6.68f
6.68LF

Discuss Question

Answer: Option B. -> 6.68L

6.68 is double.

6.68L is long double constant.

6.68f is float constant.

6.68LF is not allowed in c.

Question 17.

Point out the error in the following program.

#include<stdio.h>
int main()
{
int (*p) () = fun:
(*p) ();
return 0;
}
int fun ()
{
printf("Placementadda\n");
return 0;
}

Error: in int(*p)() = fun;
Error: fun() prototype not defined
No error
None of these

Discuss Question

Answer: Option B. -> Error: fun() prototype not defined

The compiler will not know that the function int fun() exists. So we have to
define the function prototype of int fun();
To overcome this error, see the below program

#include<stdio.h>
int fun(); /* function prototype */
int main()
{
int(*p) () = fun;
(*p) ();
return 0;
}
int fun()
{
printf("Placementadda\n");
return 0;
}

Question 18.

Which of the following operations are INCORRECT?