1. Midterm preview

2. True / False statement: double int = 2.0;
The following is a syntactically correct variable declaration and assignment
statement:
True / False
double int = 2.0;

3. The diagram in Figure 1a is the decision structure logic of the Java statements in Figure 1b.
if (Condition_1){
if (Condition_2){
Statement_B;
}else{
Statement_C; }
if (! Condition_1){
Statement_A;
Figure 1a
Figure 1b
True / False

4. Java is a case sensitive programming language. True / False

5. True / False letter = “a”; statement is syntactically correct:
Assuming that letter has been declared as a variable of type char, the below
statement is syntactically correct:
True / False
letter = “a”;

6. True / False True / False
For the logical AND operator, &&, which connects two boolean expressions, both
expressions must be false for the overall expression to be false.
True / False

7. The below two pieces of code output the same thing to the console:
True / False
The below two pieces of code output the same thing to the console:
int someVariable = 0;
System.out.println(“Output : “ + someVariable);
int someVar1 = 1, someVar2 = 2;
System.out.println(“Output : “ + someVar1 / someVar2);

8. True / False
Syntax errors are mistakes that the programmer has made that violate the rules of the programming language.

9. True / False
The following Java code is syntactically incorrect:

10. True / False
The following piece of Java code is syntactically correct:

11. True / False
The equality operator, ==, cannot be used to compare the values stored in two variables of type String.
You can compare the values of the variables, but not actual String values.

12. Assuming x has been declared as a variable of type int, the below Java code in the box is equivalent to
which of the logical statements?
A. If x is greater than 0 and x is less than 99
B. If x is greater than 1 and x is less than 99
C. If x is (0 or greater) and x is less than 99
D. If x is (0 or greater) and x is at most 99
if (x > -1 && x < 100) D.

13. A. String sentence = “heya”; if (x > -1 && x < 100)
What does the following piece of Java code output:
A. heya
B. Heya
C. HeYa
D. HEYA
String sentence = “heya”;
System.out.println(sentence.toLowerCase());
if (x > -1 && x < 100) A.

14. 13. Major components of a typical modern computer consist of:
13. Major components of a typical modern computer consist of:
A. The Central Processing Unit
B. Input/output devices
C. Secondary storage devices
D. All of the above D.

15. int x = 25, y = 8; x += (7-y); y--; A.
What will be the values of x and y after the following code is executed?
A. x = 24, y = 7
B. x = 24, y = 8
C. x = 25, y = 7
D. x = 25, y = 8
E. x = 26, y = 7
F. x = 26, y = 8
int x = 25, y = 8;
x += (7-y);
y--;
if (x > -1 && x < 100) A.

16. double percentVal = 0.0; int purchase = 950; char cust = 'N';
What would be the value of percentVal after the following statements are executed?
A. x = 24, y = 7
B. x = 24, y = 8
C. x = 25, y = 7
D. x = 25, y = 8
E. x = 26, y = 7
F. x = 26, y = 8
double percentVal = 0.0; int purchase = 950;
char cust = 'N';
if (purchase > 1000){
if (cust == 'Y')
percentVal = .05;
else
percentVal = .04;
} else {
percentVal = .03;
percentVal = .02; }
if (x > -1 && x < 100)
A. 0.05
B. 0.04
C. 0.03
D. 0.02 E A.

17. Please plug this code in your jGrasp to catch all the errors…
For the below Java code, circle any portion that contains a syntax error. Circle those parts of the Java code where there is a mistyped character, missing semicolon, etc.
A. x = 24, y = 7
B. x = 24, y = 8
C. x = 25, y = 7
D. x = 25, y = 8
E. x = 26, y = 7
F. x = 26, y = 8
public class HowMuchTimeRemaining public static void main (String[] args){ timeRemaining double = 12.5; timeSinceStart double = 33.0;
if (timEremaining =< ){ System.out.println("Less than 10 minutes left.") } else if (timeRemaining < ){ System("Less than but more than minutes left.") } else { System.out.println("Ahh. At least 20 minutes remaining.") } } }
if (x > -1 && x < 100)
Please plug this code in your jGrasp to catch all the errors…

19. Explain the following line of code (do NOT predict the value of x; explain what the statement does).
final int x = 10/5;
Your Answer : x is going to be equal 2, one can not change it’s value after this assignment because x is declared “final”.

20. What is the value of y after the following code is executed?
int y = 1;
while (y < 10){
y += 3; } 10

21. What is the output of the following Java Program?
Your Answer : ________________________________________________
public class MidtermQuestion { public static void main (String[] args){ String cwu = "Central Washington University"; System.out.print(cwu.substring(0,1)); System.out.println(cwu.substring(cwu.length()-3 ,cwu.length())); } }

22. The binary encoding 00001110 is equivalent to what base-10 number
The binary encoding is equivalent to what base-10 number? Show your work to receive partial credit, in the case that your answer is incorrect.
Your Answer : 14

23. Write a one-line syntactically correct Java statement that declares a variable animal of type String and assigns it the value tiger
Your Answer: String animal = “tiger”;

24. for (int I = 2; I =< 50; I +=2;) { System.out.println(i); }
Write a Java program that will print to the console all even integers starting from 2 through (and
including) 50. Complete the program, which has been started for you. Hint: you can use a while or
for loop. Hint 2: One correct solution requires only 3 lines of VERY simple code.
// A program that prints the even integers // from 2 through (and including) 50 public class EvenNumFrom2Through50 { // the main routine public static void main (String[] args) {
  for (int I = 2; I =< 50; I +=2;) {
System.out.println(i); }
} }

25. Which of the following statements is/are true about comments.
A. A single line comment begins with the characters \\
B. A multiple-line comment begins with */
C. The following is a syntactically correct comment: // */ */ //////////
D. Single-line comments are ignored by the compiler
E. Multiple-line comments are not ignored by the compiler
F. Multiple-line comments must end with the characters /*

26. Based on the for-loop shown below, which of the lettered choice is/are correct?
A. The body of the for-loop will be executed 5 times
B. The i+=2 part of the for loop will be performed 5 times
C. The output produced by the for loop will be
D. The i+=2 part of the for loop is performed as many times as the i<10 check is performed
E. The i<10 part of the for loop is the initialization portion, and is executed only once
F. The i+=2 part of the for loop is executed at least once.
for (int i=-1; i<10; i+=2){
System.out.print(i); }