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QUIZ for SECTION IV

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QUESTION 1:

Write a program to multiply a 'double' times an 'int' and make the result an 'int'. Display the result. Would you have to do explicit casting ?

QUESTION 2:

Given the following local variables and their values: double a = 23.31 ;
double b = 122.9 ; What is the value of 'result' below for each of the lines of code a through d ?

a)     double result = (int)a + b;

b)     int result = (int)a + (int)b;

c)     int result = (int)(a + (int)b);

d)     int result = (int)(a + b);

QUESTION 3:

What arithmetic operator would you use to find if an integer is divisible by a number ?

QUESTION 4:

Given the following code, what number is displayed ? class Quiz
{ public static void main(String[] args)
{ int number = 0;
number+=2;
System.out.println("number = " + ++number); } }

QUESTION 5:

If int i = 4. what is ~i ?

QUESTION 6:

If flag = false, what is !flag ?

QUESTION 7:

Given the following code, what would be displayed ? class Quiz
{ int year;
public static void main(String[] args)
{ boolean flag1 = true;
boolean flag2 = true;
if (flag1 && (flag2 = false)) // an assignment in this evaluation
{ flag1 = false; }
System.out.println("flag1 = " + flag1);
System.out.println("flag2 = " + flag2); } }

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ANSWER to QUESTION 1:

class Quiz
{ public static void main(String[] args)
{ double a = 2.454;
int b = 45;
int result = (int)(a * b); // casting is explicit
System.out.println(result); // displays 110 } }
Yes, casting is explicit.

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ANSWER to QUESTION 2:

a)     145.9
b)     145
c)     145
d)     146

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ANSWER to QUESTION 3:

% The modulo operator

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ANSWER to QUESTION 4:

number = 3

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ANSWER to QUESTION 5:

-5

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ANSWER to QUESTION 6:

!flag = true;

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ANSWER to QUESTION 7:

flag1 = true
flag2 = false;

flag2 was assigned to false when the 'if' expression was evaluated.
The 'if' construct was not implemented as it was evaluated to false, and therefore flag1 remained true.

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