AP Computer Science A - Code Segment Question

Consider the following code segment. for (int j = 0; j < 4; j++) { for (/* missing code */) { System.out.print(j + " "); } System.out.println(); } This code segment is intended to produce the following output: 0 1 1 2 2 2 3 3 3 3 Which of the following can be used to replace /* missing code */ so that this code segment works as intended?

• int k = 0; k < j; k++

• int k = 0; k <= j; k++

• int k = j; k < 4; k++

• int k = j; k <= 4; k++

What is the correct answer?

• The outer loop counts from j = 0 up to j = 3, incrementing by 1. The inner loop counts up from k = 0 to k = j.

• The outer loop counts from j = 1 up to j = 4, incrementing by 1. The inner loop counts up from k = 1 to k = j.

• The outer loop counts from j = 0 up to j = 3, incrementing by 2. The inner loop counts up from k = 0 to k = j.

• The outer loop counts from j = 1 up to j = 4, incrementing by 2. The inner loop counts up from k = 1 to k = j.

Consider the following code segment. int val = 48; int div = 6; while ((val % 2 == 0) && div > 0) { if (val % div == 0) { System.out.print(val + " "); } val /= 2; div--; } What is printed when the code segment is executed?

• 48 12 6

• 48 12 6 3

• 48 12 6 3 1

• 48 24 12 6

Consider the following code segment. for (int j = 4; j > 0; j--) { for (/* missing code */) { System.out.print(k + " "); } System.out.println(); } This code segment is intended to produce the following output. 0 1 2 3 0 1 2 0 1 0 Which of the following can be used to replace /* missing code */ so that this code segment works as intended?

• int k = 0; k < j; k++

• int k = 0; k <= j; k++

• int k = j; k > 0; k--

• int k = j; k >= 0; k--

Consider the following code segment, which is intended to print the sum of all the odd integers from 1 to 101, inclusive. int r = 1; int sum = 0; while (r <= 101) { /* missing code */ r++; } System.out.println(sum); Which of the following can be used to replace /* missing code */ so that the code segment works as intended?

• sum += r;

• sum += r * r;

• sum += r / 2;

• sum += r - 1;

Which of the following code snippets correctly adds the value of r to sum only when r is odd?

• if (r % 2 != 1) { sum += r; }

• if (r % 2 != 1) { sum++; }

• if (r % 2 == 1) { sum += r; }

• if (r % 2 == 1) { sum++; }

Consider the following code segment. The code is intended to read nonnegative numbers and compute their product until a negative number is read; however, it does not work as intended. (Assume that the readInt method correctly reads the next number from the input stream.) int k = 0; int prod = 1; while (k >= 0) { System.out.print("enter a number: "); k = readInt(); // readInt reads the next number from input prod = prod * k; } System.out.println("product: " + prod); Which of the following best describes the error in the program?

• The variable prod is incorrectly initialized.

• The while condition always evaluates to true.

• The negative number entered to signal no more input is included in the product.

• If the user enters a zero, the computation of the product will be terminated prematurely.

Consider the following code segment: int count = 0; for (int k = 0; k < 10; k++) { count++; } System.out.println(count); Which of the following code segments will produce the same output as the code segment above?

• int count = 0; for (int k = 1; k < 10; k++) { count++; } System.out.println(count);

• int count = 1; for (int k = 1; k <= 10; k++) { count++; } System.out.println(count);

• int count = 1; for (int k = 0; k <= 9; k++) { count++; } System.out.println(count);

• int count = 0; for (int k = 9; k >= 0; k--) { count++; } System.out.println(count);

Consider the following code segment. int num = 1; while (num < 5) { System.out.print("A"); num += 2; } What is printed as a result of executing the code segment?

• A

• AA

• AAA

• AAAA

Consider the following code segment. int a = 1; String result = ""; while (a < 20) { result += a; a += 5; } System.out.println(result); What is printed as a result of executing this code segment?

• 161116

• 15101116

• 12345678910111213141516171819

• 115101520