Unit 3 Review

If a = 15 and b = 12, what is the result of the following:

if (a ==10)

{ b = b + a;

a = 5; }

else if (a > 10)

{ a = a - b;

b = a * b; }

a = _______________ b = ____________

What will be the output for the following program segment?

int junk = 12;

if (junk > 5)

if (junk % 5 == 0)

System.out.println ("The value of junk is: " + junk);

else

System.out.println(("Junk is negative");

Find the errors in the following if statement.

if x > 0 then System.out.println(x);

• needs an == sign

• No parentheses around x > 0

• "then" is not used in java

• No parentheses around x > 0 and "then" is not used in java

Find the error in the following if statement.

if ( x = 1) { y ++;}

• y ++ is not a valid statement

• the curly brackets will cause a compile error

• the condition should be (x == 1)

• there is no else statement

Find the error in the following if statement.

String word = new String("Hello");

String word2 = new String("Hello");

if (word == word2)

System.out.println("The words are the same");

else

System.out.println("The words are not the same");

• it is missing curly brackets

• you need to use .equals() instead of ==

• you need to use = instead of ==

• There is no error

Find the error in the following if statements.

String word = new String ("Hello");

String word2 = new String("Hello");

if (word.equals(word2));

System.out.println("The words are the same");

else

System.out.println("The words are not the same");

• use == instead of .equals()

• there are no curly brackets

• remove the ; at the end of the if condition

• use = instead of .equals()

What is the value of s if x = 5 and y = 2 after executing the following cod:

s = 0;

if (x > 0) { s++;}

if (y > 0) {s ++;}

• s = 0

• s = 1

• s = 2

• s = -2

What is the value of s if x = 5 and y = 2 after the execution of the following code?

s = 0;

if (x > 0) { s ++;}

else if (y > 0) {s ++; }

• s = 0

• s = 1

• s = 2

• s = -1

What does the following code fragment print?

double x = 0;

double y = 1;

if (Math.abs(x - y) < 1)

System.out.println(x);

else

System.out.println(y);

• -1

• 0

• 1

• 2

What does the following code fragment print?

double x = Math.pow(4,2);

double y = 2;

if (x == y * y * y)

System.out.println(x);

else

System.out.println(y);

• -1

• 0

• 1

• 2