laboursonline – MCQs, Mock Tests | C/C C programming language MCQ Questions Set 3

Which of the following statements are false?

1. bool can have two values and can be used to express logical expressions
2. bool cannot be used as the type of the result of the function
3. bool can be converted into integers implicitly
4. a bool value can be used in arithmetic expressions

✅ Correct Answer: 2

For what values of the expression is an if-statement block not executed?

1. 0 and all negative values
2. 0 and -1
3. 0
4. 0, all negative values, all positive values except 1

✅ Correct Answer: 3

Which of the two operators ++ and — work for the bool data type in C++?

1. None
2. ++
3. —
4. ++ & —

✅ Correct Answer: 2

How many characters are specified in the ASCII scheme?

1. 64
2. 128
3. 256
4. 24

✅ Correct Answer: 2

Which of the following belongs to the set of character types?

1. char
2. wchar_t
3. only a
4. both wchar_t and char

✅ Correct Answer: 4

How do we represent a wide character of the form wchar_t?

1. L’a’
2. l’a’
3. L[a]
4. la

✅ Correct Answer: 1

In C++, what is the sign of character data type by default?

1. Signed
2. Unsigned
3. Implementation dependent
4. Unsigned Implementation

✅ Correct Answer: 3

Is the size of character literals different in C and C++?

1. Implementation defined
2. Can’t say
3. Yes, they are different
4. No, they are not different

✅ Correct Answer: 3

Suppose in a hypothetical machine, the size of char is 32 bits. What would sizeof(char) return?

1. 4
2. 1
3. Implementation dependent
4. Machine dependent

✅ Correct Answer: 2

What constant defined in <climits> header returns the number of bits in a char?

1. CHAR_SIZE
2. SIZE_CHAR
3. BIT_CHAR
4. CHAR_BIT

✅ Correct Answer: 4

The size_t integer type in C++ is?

1. Unsigned integer of at least 64 bits
2. Signed integer of at least 16 bits
3. Unsigned integer of at least 16 bits
4. Signed integer of at least 64 bits

✅ Correct Answer: 3

Which of these expressions will return true if the input integer v is a power of two?

1. (v | (v + 1)) == 0;
2. (~v & (v – 1)) == 0;
3. (v | (v – 1)) == 0;
4. (v & (v – 1)) == 0;

✅ Correct Answer: 4

Which of these expressions will make the rightmost set bit zero in an input integer x?

1. x = x | (x-1)
2. x = x & (x-1)
3. x = x | (x+1)
4. x = x & (x+2)

✅ Correct Answer: 2

Which of these expressions will isolate the rightmost set bit?

1. x = x & (~x)
2. x = x ^ (~x)
3. x = x & (-x)
4. x = x ^ (-x)

✅ Correct Answer: 3

0946, 786427373824, ‘x’ and 0X2f are _____ _____ ____ and _____ literals respectively.

1. decimal, character, octal, hexadecimal
2. octal, hexadecimal, character, decimal
3. hexadecimal, octal, decimal, character
4. octal, decimal, character, hexadecimal

✅ Correct Answer: 4

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

1. short float
2. float
3. long double
4. double

✅ Correct Answer: 1

What is the range of the floating point numbers?

1. -3.4E+38 to +3.4E+38
2. -3.4E+38 to +3.4E+34
3. -3.4E+38 to +3.4E+36
4. -3.4E+38 to +3.4E+32

✅ Correct Answer: 1

Which of three sizes of floating point types should be used when extended precision is required?

1. float
2. double
3. long double
4. extended float

✅ Correct Answer: 3

Which is used to indicate single precision value?

1. F or f
2. L or l
3. Either F or for L or l
4. Neither F or for L or l

✅ Correct Answer: 1

Which is correct with respect to the size of the data types?

1. char > int < float
2. int < char > float
3. char < int < float
4. char < int < double

✅ Correct Answer: 4

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

1. malloc
2. sizeof
3. malloc
4. calloc

✅ Correct Answer: 2

It is guaranteed that a ____ has at least 8 bits and a ____ has at least 16 bits.

1. int, float
2. char, int
3. bool, char
4. char, short

✅ Correct Answer: 4

Implementation dependent aspects about an implementation can be found in ____

1. <implementation>
2. <limits>
3. <limit>
4. <numeric>

✅ Correct Answer: 2

Size of C++ objects are expressed in terms of multiples of the size of a ____ and the size of a char is ______

1. char, 1
2. int, 1
3. float, 8
4. char, 4

✅ Correct Answer: 1

Identify the incorrect option.

1. 1 <= sizeof(bool) <= sizeof(long)
2. sizeof(float) <= sizeof(double) <= sizeof(long double)
3. sizeof(char) <= sizeof(long) <=sizeof(wchar_t)
4. sizeof(N) = sizeof(signed N) = sizeof(unsigned N)

✅ Correct Answer: 3

Which of the following will not return a value?

1. null
2. void
3. empty
4. free

✅ Correct Answer: 2

__________ have the return type void.

1. all functions
2. constructors
3. destructors
4. none of the mentioned

✅ Correct Answer: 4

What does the following statement mean? void a;

1. variable a is of type void
2. a is an object of type void
3. declares a variable with value a
4. flags an error

✅ Correct Answer: 4

Choose the incorrect option.

1. void is used when the function does not return a value
2. void is also used when the value of a pointer is null
3. void is used as the base type for pointers to objects of unknown type
4. void is a special fundamental type

✅ Correct Answer: 2

Identify the incorrect option.

1. enumerators are constants
2. enumerators are user-defined types
3. enumerators are same as macros
4. enumerator values start from 0 by default

✅ Correct Answer: 3

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

1. string
2. integer
3. float
4. string & float

✅ Correct Answer: 2

To which of these enumerators can be assigned?

1. integer
2. negative
3. enumerator
4. all of the mentioned

✅ Correct Answer: 4

What will happen when defining the enumerated type?

1. it will not allocate memory
2. it will allocate memory
3. it will not allocate memory to its variables
4. allocate memory to objects

✅ Correct Answer: 1

Which variable does equals in size with enum variable?

1. int variable
2. float variable
3. string variable
4. float & string variable

✅ Correct Answer: 1

What does the following statement mean? int (*fp)(char*)

1. pointer to a pointer
2. pointer to an array of chars
3. pointer to function taking a char* argument and returns an int
4. function taking a char* argument and returning a pointer to int

✅ Correct Answer: 3

Choose the right option. string* x, y;

1. x is a pointer to a string, y is a string
2. y is a pointer to a string, x is a string
3. both x and y are pointers to string types
4. y is a pointer to a string

✅ Correct Answer: 1

Which one of the following is not a possible state for a pointer.

1. hold the address of the specific object
2. point one past the end of an object
3. zero
4. point to a type

✅ Correct Answer: 4

Which of the following is illegal?

1. int *ip;
2. string s, *sp = 0;
3. int i; double* dp = &i;
4. int *pi = 0;

✅ Correct Answer: 3

The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is _______

1. int **fun(float**, char**)
2. int *fun(float*, char*)
3. int **fun(float*, char**)
4. int ***fun(*float, **char)

✅ Correct Answer: 3

Which of the following correctly declares an array?

1. int array[10];
2. int array;
3. array{10};
4. array array[10];

✅ Correct Answer: 1

What is the index number of the last element of an array with 9 elements?

1. 9
2. 8
3. 0
4. Programmer-defined

✅ Correct Answer: 2

What is the correct definition of an array?

1. An array is a series of elements of the same type in contiguous memory locations
2. An array is a series of element
3. An array is a series of elements of the same type placed in non-contiguous memory locations
4. An array is an element of the different type

✅ Correct Answer: 1

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

1. array[6];
2. array[7];
3. array(7);
4. array;

✅ Correct Answer: 1

Which of the following gives the memory address of the first element in array?

1. array[0];
2. array[1];
3. array(2);
4. array;

✅ Correct Answer: 4

What is the meaning of the following declaration? int(*p[5])();

1. p is pointer to function
2. p is array of pointer to function
3. p is pointer to such function which return type is the array
4. p is pointer to array of function

✅ Correct Answer: 2

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

1. 2
2. 4
3. 8
4. 0

✅ Correct Answer: 2

The constants are also called as ________

1. const
2. preprocessor
3. literals
4. variables

✅ Correct Answer: 3

What are the parts of the literal constants?

1. integer numerals
2. floating-point numerals
3. strings and boolean values
4. all of the mentioned

✅ Correct Answer: 4

How are the constants declared?

1. const keyword
2. #define preprocessor
3. both const keyword and #define preprocessor
4. $define

✅ Correct Answer: 3