Units 1 to 6: Mock Exam Final - AP Computer Science A

Front

int x = 5;
double y = x;

What is the value of y?

Back

5.0

Front

Which is a valid Java boolean expression? Options: true && 5, false == 1, 7 > 3, 3 + 5

Back

7 > 3

Front

Which code snippet correctly casts a double to an int? Options: int a = 7.2; int a = (int)7.2; int a = double(7.2); int a = toInt(7.2);

Back

int a = (int)7.2;

Front

If myFlag is a boolean variable, which assignment is valid? myFlag = "true"; myFlag = 1; myFlag = (boolean) 1; myFlag = true;

Back

myFlag = true;

Front

Which condition will check if a number x is between 10 and 20 (inclusive)? Options: (x > 10 && x < 20), (x >= 10 && x <= 20), (x == 10 || x == 20), (10 < x && x < 20)

Back

(x >= 10 && x <= 20)

Front

Which of the following code segments, when placed in a method in a class other than WindTurbine, will construct a WindTurbine object wt with an efficiencyRating of 0.25? Options: WindTurbine wt = new WindTurbine(0.25);, WindTurbine wt = 0.25;, WindTurbine wt = new WindTurbine();
wt = 0.25;, WindTurbine wt = new WindTurbine();
wt.efficiencyRating = 0.25;, new WindTurbine wt = 0.25;

Back

WindTurbine wt = new WindTurbine(0.25);

Front

What is printed as a result of executing the following code segment?
int k = 1; while (k < 20) { if ((k % 3) == 1) System.out.print(k + " "); k++; }

Back

1 4 7 10 13 16 19

Front

Consider the following Boolean expression in which the int variables x and y have been properly declared and initialized. (x <= 10) == (y > 25). Which of the following values for x and y will result in the expression evaluating to true? Options: x = 8 and y = 25, x = 10 and y = 10, x = 10 and y = 30, x = 15 and y = 30, x = 25 and y = 30

Back

x = 10 and y = 30

Front

What, if anything, is printed as a result of executing the code segment: int[] arr = {3, 1, 0, 4, 2}; for (int j = 0; j < arr.length; j++) { System.out.print(arr[j] + j + " "); }

Back

3 2 2 7 6

Front

What value is returned as a result of the method call changeStr("12345")?

Back

"53"