CPP Online Quiz or C++ Online Quiz, CPP MCQ Quiz and Online Test

1 .

Is bool a fundamental data type in C++?

A)

Yes

B)

No, it is an enum of {false, true}

C)

No, it is expanded from macros

D)

No, it is a typedef of unsigned char

Correct Answer : Option (A) : Yes

Explanation : C++ has bool as a fundamental data type.

2 .

How many characters are specified in the ASCII scheme?

A)

64

B)

128

C)

256

D)

512

Correct Answer : Option (B) : 128

Explanation : There are 128 characters defined in the C++ ASCII list.

3 .

The size_t integer type in C++ is?

A)

Unsigned integer of at least 64 bits

B)

Signed integer of at least 64 bits

C)

Unsigned integer of at least 16 bits

D)

Signed integer of at least 16 bits

Correct Answer : Option (C) : Unsigned integer of at least 16 bits

Explanation : The size_t type is used to represent the size of an object. Hence, it’s always unsigned. According to the language specification, it is at least 16 bits.

4 .

Which of the following is not one of the sizes of the floating point types?

A)

long double

B)

short float

C)

float

D)

double

Correct Answer : Option (B) : short float

Explanation : Floating point types occur in only three sizes-float, long double and double.

5 .

The size of an object or a type can be determined using which operator?

A)

sizeof

B)

malloc

C)

calloc

D)

None of the above

Correct Answer : Option (A) : sizeof

Explanation : The sizeof operator gives the size of the object or type.

6 .

In which type do the enumerators are stored by the compiler?

A)

float

B)

string

C)

string & float

D)

integer

Correct Answer : Option (D) : integer

Explanation : In C++, enumerations are stored as integers by the compiler starting with 0.

7 .

What does the following statement mean?

int (*fp)(char*)â€‹

A)

pointer to a pointer

B)

pointer to an array of chars

C)

function taking a char* argument and returning a pointer to int

D)

pointer to function taking a char* argument and returns an int

Correct Answer : Option (C) : pointer to function taking a char* argument and returns an int

8 .

Which of the following accesses the seventh element stored in array?

A)

array[7];

B)

array[6];

C)

array(7);

D)

array(6);

Correct Answer : Option (B) : array[6];

Explanation : The array location starts from zero, So it can accessed by array[6].

9 .

What is size of generic pointer in C++ (in 32-bit platform)?

A)

0

B)

2

C)

4

D)

8

Correct Answer : Option (C) : 4

Explanation : Size of any type of pointer is 4 bytes in 32-bit platforms.

10 .

What will be the output of the following C++ code?

 #include 
   using namespace std;
   int main()
   {
       int a[2][4] = {3, 6, 9, 12, 15, 18, 21, 24};
       cout << *(a[1] + 2) << *(*(a + 1) + 2) << 2[1[a]];
       return 0;
   }â€‹

A)

21 21 21

B)

15 18 21

C)

24 24 24

D)

Compile time error

Correct Answer : Option (A) : 21 21 21

Explaination :

a[1][2] means 1 * (4)+2 = 6th element of an array starting from zero.

Output :

$ g++ point.cpp
$ a.out
21 21 21â€‹