Question

Quiz

Question 1 (1 point)

Saved

The maximum value for an int is:

Question 1 options:

	2147483647
	65535
	32767
	9223372036854775804

Question 2 (1 point)

A float has ____ decimal places of accuracy.

Question 2 options:

	15
	none
	7
	3

Question 3 (1 point)

It is a good practice to compare floats and doubles with ==.

Question 3 options:

	True
	False

Question 4 (1 point)

Strings are reference data types.

Question 4 options:

	True
	False

Question 5 (1 point)

Value data types and references are stored on the stack while objects are stored on the heap.

Question 5 options:

	True
	False

Question 6 (1 point)

!(a && b) == ________

Question 6 options:

	(!a && !b)
	(!a || !b)
	(a && !b)
	(!a || b)

Question 7 (1 point)

What value is stored in num by this code segment?

int a = 6;  

int b = 7;

int num =0;

if(a == b)

num=2;

else

num=-2;

Question 7 options:

	0
	-1
	2
	-2

Question 8 (1 point)

Given:

int a = 5;

int b = 7;

Does the following expression evaluate to true or false?

(b > a) && (a + b <a * b)

Question 8 options:

	True
	False

Question 9 (1 point)

When working with objects, the comparison operator (==) checks to see if the variable (object reference) points to the same object, i.e., the variable stores the same address.

Question 9 options:

	True
	False

Question 10 (1 point)

Switch statements can use integers, bytes, enumerated types characters and strings as the expression to switch on. switch(expression):

Question 10 options:

	True
	False

Answer 1

""""""""""""""""""""""""""""""If any doubt please comment"""""""""""""""""""""""""""""""""""

Q1)

ans) 32767 ( 2 byte)

int is stored in 2 byte and its value ranges from -32,768 to 32,767

Q2)

ans) 7

Fact: Float has 7 decimal digit of precision

Q3)

ans) False

No comparing float and double with (==) is not a good idea as it produce some unexpected error

Q4)

ans) True

A reference type contains a pointer to another memory location that holds the data. Therefore string and array both are reference type.

Q5)

ans) True

The local variable is stored on the stack, while the object itself is stored on the heap: The stack is always used to store the following two things: ... Value-typed local variables and method parameters (structs, as well as integers, bools, chars, DateTimes, etc.)

Q6)

ans) (! a || ! b)

By DeMorgans's law: !(a and b) = !a or ! b

Q7)

ans) d option ( - 2 )

Since a==b is not true therefore else statement will be executed and num will have value -2.

Q8)

ans) True

a=5

b=7

(b > a) && (a + b <a * b)

we can see that (b > a)=true and (a + b <a * b)=true therefore and will return true.

Q9)

ans) True

(==) compares the references. That is, are these two objects located at the same place.

Q10)

ans) True

A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types (discussed in Enum Types), the String class, and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer