Question

1) Copy and paste the code below into your IDE, and then answer the question.

if (false) {
    System.out.println("Hello");
}

What happens and why?

A) Hello is not displayed because the if statement is false

B) "Hello" is displayed even if the if statement is false because the semicolon is cutting it off from its body

C) Program does not run due to a compiler error ie semicolon

D) "Hello" is displayed since the expression in the if statement registers true

2) What is the value of x?

y = true;
m = false;
x = (!y && m) || m;

A) True

B) False

3) Which if statement executes if the variable y is divisible by 6?

A) if (y % 6 ==0)

B) if (y % 5 == 0)

C) if (y % 5 == 1)

D) if (y / 6 == 1)

E) if (y % 6)

4) A program needs to save a customer's name, age, and price total. What would be three appropriate variable data types and names? Pay attention to naming conventions as well.

A) String name, int age, double PRICETotal

B) String name, int age, double priceTotal

C) int name, int age, double priceTotal

D) String name, double age, double priceTotal

Answer 1

Qtn 1 - The correct answer is A) Hello is not displayed because the if statement is false

The if statement executes it's block only if the condition provided evaluates to True. In this case since it is False, it will not execute its block and hence hello will not be displayed

Qtn 2 - The correct answer is B) False

The expression for x is (!y && m) || m

Substituting the values for y and m, we get

--> (!true && false) || false

--> (false && false) || false

--> false || false

--> false

Qtn 3 - The correct answers is A) if (y % 6 ==0)

The % (modulus) operator is used to get the remainder of a division

Since y is divisible by 6 , the remained of dividing y by 6 should be 0. i.e y % 6 should be 0

Thus if y is divisible by 6 then y%6==0 and since the condition is true , that if statement will be executed

Qtn 4 - The correct answer is B) String name, int age, double priceTotal

Since the name of a person cannot include numbers, we use a String datatype for it. Hence String name

Since age will be a number (eg. 12, 25 etc) we use an integer (int) datatype.

Since total price can be floating point value (eg, 400.5 , 506.75 ) we have to use double

Also the naming convention followed should be camel-case (each word or abbreviation in the middle of the phrase begins with a capital letter, with no intervening spaces or punctuation)