Java Module 4 Question Preview (ID: 27919)
Identifiers, Assignment Operators And Numeric Data Type.
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How would you assign the integer 5 to a variable named numberFive? Assume the variable is already declared
a) numberFive == 5;
b) numberFive = 5;
c) 5 = numberFive;
d) numberFive := 5;
Which of the following is a valid Java variable?
a) 95miles
b) numbers#text
c) final
d) _thisDog
Suppose x is 1. What is x after x += 2?
a) 1
b) 3
c) 4
d) -1
Which of the following contains a valid comment?
a) int twoPi = 2 * 3.14159; /* holds the value of two times pi */
b) int twoPi = 2 * 3.14159; /* holds the value of two times pi //*
c) int twoPi = 2 * 3.14159; /*/ *holds the value of two times pi //*
d) none of the above
To declare an int variable number with initial value 2, you write ___________
a) int number = 2L;
b) integer number = 2;
c) int number = 2.0;
d) int number = 2;
The expression 4 + 20 / (3 - 1) * 2 is evaluated to ______________
a) 4
b) 24
c) 20
d) 9
25 % 1 is _____
a) 1
b) 2
c) 3
d) 0
Which of the following is the correct way to declare a variable?
a) int length width;
b) int length, width
c) int length; width;
d) int length, int width;
What is the result of 45 / 4?
a) 10
b) 11
c) 11.25
d) 12
Which of the following expression results in a value 1?
a) 2 % 1
b) 15 % 4
c) 25 % 5
d) 37 % 6
To declare a constant MAX_LENGTH inside a method with value 99.98, you write
a) final MAX_LENGTH = 99.98;
b) double MAX_LENGTH = 99.98;
c) final double MAX_LENGTH = 99.98;
d) none of the above
Which of the following is a correct name for variables according to Java camel case naming conventions?
a) FindArea
b) findArea
c) findarea
d) FINDAREA
An int variable can hold:
a) 'x'
b) 120.5
c) abc
d) 120
In Java, which of the following is not a numerical type?
a) int
b) char
c) byte
d) double
Before a variable is used it must be _______________
a) defined
b) declared
c) imported
d) assigned
Which of the following is a valid identifier?
a) $total
b) class
c) 8+9
d) 9x
An identifier that cannot be used as a variable name is a ___________________ word
a) special
b) reserved
c) key
d) long
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