AP Comp Sci A MidTerm Review

Consider the following variable declarations and initializations.

int a = 2;

int b = 6;

int c = 3;

Which of the following expressions evaluates to false ?

• a < b == c < b

• a > b == b < c

• a < b != b < c

• a < b != c < b

Consider the following code segment.

boolean a = true;

boolean b = false;

System.out.print((a == !b) != false);

What is printed as a result of executing this code segment?

• false

• true

• 0

• 1

Consider the following expression.

(3 + 4 == 5) != (3 + 4 >= 5)

What value, if any, does the expression evaluate to?

• true

• false

• 5

• 7

Consider the following code segment.

int m = 8;

int n = 3;

if (m + n > 10)

{

System.out.print(m + n);

}

if (m - n > 0)

{

System.out.print(m - n);

}

What, if anything, is printed as a result of executing the code segment?

• nothing is printed

• 115

• 11

• 5

Consider the following code segment.

boolean a = true;

boolean b = true;

System.out.print((b || (!a || b)) + " ");

System.out.print(((!b || !a) && a) + " ");

System.out.println(!(a && b) && b);

What output is produced when this code segment is executed?

• true true true

• true false true

• true false false

• false true false

In the following expression, j, k, and m are properly declared and initialized int variables.

!((j == k) && (k > m))

Which of the following is equivalent to the expression above?

• (j != k) || (k < m)

• (j != k) || (k <= m)

• (j == k) || (k < m)

• (j != k) && (k <= m)

In the following expression, sunny and windy are properly declared and initialized boolean variables.

!sunny && !windy

Which of the following is equivalent to the expression above?

• sunny || windy

• !sunny || !windy

• !(sunny || windy)

• !(sunny && windy)

In the following expression, sweet, salty, and sour are properly declared and initialized boolean variables.

sweet && (salty || sour)

Which of the following expressions is equivalent to the expression above?

• (sweet && salty) || sour

• (sweet && salty) || (sweet && sour)

• (sweet && salty) && (sweet && sour)

• (sweet || salty) && sour

Consider the following code segment.

String str1 = new String("Happy");

String str2 = new String("Happy");

System.out.print(str1.equals(str2) + " ");

System.out.print(str2.equals(str1) + " ");

System.out.print(str1 == str2);

What is printed as a result of executing the code segment?

• true true true

• true true false

• false true false

• false false true

Consider the following code segment.

String myString = new String("my string");

String yourString = new String();

yourString = "my string";

boolean dotEquals = myString.equals(yourString);

boolean equalsEquals = (myString == yourString);

System.out.print(dotEquals + " " + equalsEquals);

What is printed as a result of executing the code segment?

• true true

• true false

• false true

• false false