AP CSA Array Practice Exam

Question 1

What is printed?

int[] nums = {10, 20, 30, 40, 50};
System.out.println(nums[2]);

A) 10
B) 20
C) 30
D) 40

Question 2

What is printed?

int[] scores = {85, 90, 78, 92};
System.out.println(scores.length);

A) 3
B) 4
C) 92
D) 5

Question 3

What is printed?

int[] vals = {5, 10, 15, 20, 25};
System.out.println(vals[vals.length - 1]);

A) 5
B) 20
C) 25
D) Error

Question 4

What is printed?

int[] arr = new int[4];
arr[0] = 7;
arr[2] = 3;
System.out.println(arr[0] + " " + arr[1] + " " + arr[2]);

A) 7 0 3
B) 7 null 3
C) 7 7 3
D) Error

Question 5

What is printed?

int[] nums = {2, 4, 6};
for (int i = 0; i < nums.length; i++) {
    System.out.print(nums[i] + " ");
}

A) 2 4 6
B) 0 1 2
C) 2 4 6 8
D) Error

Question 6

What is printed?

int[] nums = {3, 7, 2, 8};
int sum = 0;
for (int i = 0; i < nums.length; i++) {
    sum += nums[i];
}
System.out.println(sum);

A) 8
B) 18
C) 20
D) 4

Question 7

What is printed?

int[] nums = {1, 2, 3, 4};
int total = 0;
for (int n : nums) {
    total += n;
}
System.out.println(total);

A) 4
B) 10
C) 0 1 2 3
D) Error

Question 8

What is printed?

int[] nums = {5, 12, 8, 3, 15, 7};
int count = 0;
for (int i = 0; i < nums.length; i++) {
    if (nums[i] > 6) {
        count++;
    }
}
System.out.println(count);

A) 2
B) 3
C) 4
D) 6

Question 9

What is printed?

int[] nums = {4, 9, 2, 7, 5};
int max = nums[0];
for (int i = 1; i < nums.length; i++) {
    if (nums[i] > max) {
        max = nums[i];
    }
}
System.out.println(max);

A) 4
B) 5
C) 7
D) 9

Question 10

What is printed?

int[] nums = {2, 4, 6, 8};
for (int i = 0; i < nums.length; i++) {
    nums[i] = nums[i] * 2;
}
System.out.println(nums[0] + " " + nums[3]);

A) 2 8
B) 4 16
C) 4 8
D) 2 16

Question 11

What is printed?

int[] nums = {8, 3, 12, 5, 1, 9};
int min = nums[0];
for (int i = 1; i < nums.length; i++) {
    if (nums[i] < min) {
        min = nums[i];
    }
}
System.out.println(min);

A) 1
B) 3
C) 8
D) 12

Question 12

What is printed? (Linear search with break)

int[] nums = {10, 25, 30, 25, 40};
int target = 25;
int index = -1;
for (int i = 0; i < nums.length; i++) {
    if (nums[i] == target) {
        index = i;
        break;
    }
}
System.out.println(index);

A) -1
B) 1
C) 3
D) 25

Question 13

What is printed? (No break)

int[] nums = {10, 25, 30, 25, 40};
int target = 25;
int index = -1;
for (int i = 0; i < nums.length; i++) {
    if (nums[i] == target) {
        index = i;
    }
}
System.out.println(index);

A) -1
B) 1
C) 3
D) 4

Question 14

What is printed?

int[] nums = {4, 8, 15, 16, 23};
int target = 15;
boolean found = false;
for (int n : nums) {
    if (n == target) {
        found = true;
        break;
    }
}
System.out.println(found);

A) true
B) false
C) 15
D) 2

Question 15

What is printed?

int[] nums = {80, 90, 85, 95};
int sum = 0;
for (int n : nums) {
    sum += n;
}
double avg = (double) sum / nums.length;
System.out.println(avg);

A) 87
B) 87.5
C) 87.0
D) 350

Question 16

What is printed?

int[] nums = {3, 8, 12, 7, 4, 9};
int even = 0, odd = 0;
for (int n : nums) {
    if (n % 2 == 0) even++;
    else odd++;
}
System.out.println(even + " " + odd);

A) 2 4
B) 3 3
C) 4 2
D) 6 0

Question 17

What is printed?

int[] nums = {1, 2, 3, 4, 5};
for (int i = nums.length - 1; i >= 0; i--) {
    System.out.print(nums[i] + " ");
}

A) 1 2 3 4 5
B) 5 4 3 2 1
C) 4 3 2 1 0
D) Error

Question 18

What is printed?

int[] nums = {3, 6, 9, 12, 15, 18};
int sum = 0;
for (int n : nums) {
    if (n % 2 == 0) {
        sum += n;
    }
}
System.out.println(sum);

A) 27
B) 36
C) 63
D) 18

Question 19

What is printed after swapping first and last?

int[] nums = {10, 20, 30, 40, 50};
int temp = nums[0];
nums[0] = nums[nums.length - 1];
nums[nums.length - 1] = temp;
System.out.println(nums[0] + " " + nums[4]);

A) 10 50
B) 50 10
C) 50 50
D) 10 10

Question 20

What is printed?

int[] nums = {12, 8, 16, 4, 20};
boolean allEven = true;
for (int n : nums) {
    if (n % 2 != 0) {
        allEven = false;
        break;
    }
}
System.out.println(allEven);

A) true
B) false
C) 5
D) Error

Question 21

What is printed after shifting left?

int[] nums = {10, 20, 30, 40, 50};
int first = nums[0];
for (int i = 0; i < nums.length - 1; i++) {
    nums[i] = nums[i + 1];
}
nums[nums.length - 1] = first;
System.out.println(nums[0] + " " + nums[1] + " " + nums[4]);

A) 10 20 50
B) 20 30 10
C) 20 30 50
D) 50 10 40

Question 22

What is printed after shifting right?

int[] nums = {10, 20, 30, 40, 50};
int last = nums[nums.length - 1];
for (int i = nums.length - 1; i > 0; i--) {
    nums[i] = nums[i - 1];
}
nums[0] = last;
System.out.println(nums[0] + " " + nums[1] + " " + nums[4]);

A) 10 20 50
B) 20 30 10
C) 50 10 40
D) 50 20 40

Question 23

What is printed?

int[] nums = {5, 3, 5, 7, 5, 9, 5};
int target = 5;
int count = 0;
for (int n : nums) {
    if (n == target) count++;
}
System.out.println(count);

A) 1
B) 3
C) 4
D) 7

Question 24

What is printed?

int[] nums = {3, 7, 12, 15, 20};
boolean sorted = true;
for (int i = 0; i < nums.length - 1; i++) {
    if (nums[i] > nums[i + 1]) {
        sorted = false;
        break;
    }
}
System.out.println(sorted);

A) true
B) false
C) 20
D) Error

Question 25

What is the second largest value?

int[] nums = {12, 45, 7, 38, 23};
int max = nums[0], second = nums[0];
for (int n : nums) {
    if (n > max) {
        second = max;
        max = n;
    } else if (n > second && n != max) {
        second = n;
    }
}
System.out.println(second);

A) 12
B) 38
C) 45
D) 23

Question 26

What is printed after removing element at index 2?

int[] nums = {10, 20, 30, 40, 50};
int removeIndex = 2;
for (int i = removeIndex; i < nums.length - 1; i++) {
    nums[i] = nums[i + 1];
}
nums[nums.length - 1] = 0;
System.out.println(nums[2] + " " + nums[3] + " " + nums[4]);

A) 30 40 50
B) 40 50 0
C) 40 50 50
D) 20 40 50

Question 27

What is printed after inserting 30 at index 2?

int[] nums = {10, 20, 40, 50, 0};
int insertIndex = 2, value = 30;
for (int i = nums.length - 1; i > insertIndex; i--) {
    nums[i] = nums[i - 1];
}
nums[insertIndex] = value;
System.out.println(nums[2] + " " + nums[3] + " " + nums[4]);

A) 30 40 50
B) 40 50 0
C) 30 40 0
D) 20 30 40

Question 28

What is printed? (Deep copy)

int[] original = {5, 10, 15};
int[] copy = new int[original.length];
for (int i = 0; i < original.length; i++) {
    copy[i] = original[i];
}
copy[0] = 99;
System.out.println(original[0] + " " + copy[0]);

A) 5 99
B) 99 99
C) 5 5
D) 99 5

Question 29

What is printed? (Shallow copy trap)

int[] original = {5, 10, 15};
int[] copy = original;
copy[0] = 99;
System.out.println(original[0] + " " + copy[0]);

A) 5 99
B) 99 99
C) 5 5
D) 99 5

Question 30

What is printed after reversing in place?

int[] nums = {1, 2, 3, 4, 5};
int left = 0, right = nums.length - 1;
while (left < right) {
    int temp = nums[left];
    nums[left] = nums[right];
    nums[right] = temp;
    left++;
    right--;
}
System.out.println(nums[0] + " " + nums[2] + " " + nums[4]);

A) 1 3 5
B) 5 3 1
C) 5 2 1
D) 1 2 3

Question 31

Are these two arrays equal?

int[] a = {1, 2, 3};
int[] b = {1, 2, 3};
boolean equal = true;
if (a.length != b.length) {
    equal = false;
} else {
    for (int i = 0; i < a.length; i++) {
        if (a[i] != b[i]) {
            equal = false;
            break;
        }
    }
}
System.out.println(equal);

A) true
B) false
C) Error
D) 3

Question 32

First 3 elements after merging sorted arrays?

int[] a = {1, 4, 7};
int[] b = {2, 5, 8};
int[] merged = new int[6];
int i = 0, j = 0, k = 0;
while (i < a.length && j < b.length) {
    if (a[i] <= b[j]) {
        merged[k++] = a[i++];
    } else {
        merged[k++] = b[j++];
    }
}
// (remaining elements copied)
System.out.println(merged[0] + " " + merged[1] + " " + merged[2]);

A) 1 4 7
B) 1 2 4
C) 2 5 8
D) 1 2 3

Question 33

How many consecutive duplicate pairs?

int[] nums = {1, 2, 2, 3, 4, 4, 4, 5};
int count = 0;
for (int i = 0; i < nums.length - 1; i++) {
    if (nums[i] == nums[i + 1]) {
        count++;
    }
}
System.out.println(count);

A) 2
B) 3
C) 4
D) 5

Question 34

What is the longest streak?

int[] nums = {1, 2, 2, 2, 3, 3, 4};
int maxStreak = 1, currentStreak = 1;
for (int i = 1; i < nums.length; i++) {
    if (nums[i] == nums[i - 1]) {
        currentStreak++;
        if (currentStreak > maxStreak) maxStreak = currentStreak;
    } else {
        currentStreak = 1;
    }
}
System.out.println(maxStreak);

A) 2
B) 3
C) 4
D) 7

Question 35

Sum of elements from index 1 to 4?

int[] nums = {5, 10, 15, 20, 25, 30};
int start = 1, end = 4, sum = 0;
for (int i = start; i <= end; i++) {
    sum += nums[i];
}
System.out.println(sum);

A) 45
B) 60
C) 70
D) 105

Question 36

Is this a palindrome array?

int[] nums = {1, 2, 3, 2, 1};
boolean isPalindrome = true;
int left = 0, right = nums.length - 1;
while (left < right) {
    if (nums[left] != nums[right]) {
        isPalindrome = false;
        break;
    }
    left++;
    right--;
}
System.out.println(isPalindrome);

A) true
B) false
C) Error
D) 5

Question 37

First 3 elements after rotating right by 2?

int[] nums = {1, 2, 3, 4, 5};
int k = 2;
int[] rotated = new int[5];
for (int i = 0; i < nums.length; i++) {
    int newIndex = (i + k) % nums.length;
    rotated[newIndex] = nums[i];
}
System.out.println(rotated[0] + " " + rotated[1] + " " + rotated[2]);

A) 1 2 3
B) 3 4 5
C) 4 5 1
D) 5 1 2

Question 38

Find indices that sum to 9.

int[] nums = {2, 7, 11, 15};
int target = 9;
int index1 = -1, index2 = -1;
outer:
for (int i = 0; i < nums.length; i++) {
    for (int j = i + 1; j < nums.length; j++) {
        if (nums[i] + nums[j] == target) {
            index1 = i;
            index2 = j;
            break outer;
        }
    }
}
System.out.println(index1 + " " + index2);

A) 0 1
B) 0 2
C) 1 2
D) -1 -1

Question 39

How many unique elements?

int[] nums = {1, 1, 2, 2, 2, 3};
int[] result = new int[nums.length];
int count = 0;
for (int i = 0; i < nums.length; i++) {
    boolean isDuplicate = false;
    for (int j = 0; j < count; j++) {
        if (nums[i] == result[j]) {
            isDuplicate = true;
            break;
        }
    }
    if (!isDuplicate) {
        result[count++] = nums[i];
    }
}
System.out.println(count);

A) 2
B) 3
C) 4
D) 6

Question 40

What is printed?

int[] nums = {5, 3, 8, 1, 9};
boolean hasNegative = false;
for (int n : nums) {
    if (n < 0) {
        hasNegative = true;
        break;
    }
}
System.out.println(hasNegative);

A) true
B) false
C) -1
D) Error

Question 41

What is printed?

int[] nums = {1, 2, 3, 4, 5};
int product = 1;
for (int n : nums) {
    product *= n;
}
System.out.println(product);

A) 15
B) 120
C) 5
D) 0

Question 42

What is printed?

int[] nums = {10, 20, 30, 40};
int[] doubled = new int[nums.length];
for (int i = 0; i < nums.length; i++) {
    doubled[i] = nums[i] * 2;
}
System.out.println(nums[0] + " " + doubled[0]);

A) 10 20
B) 20 20
C) 20 40
D) 10 10

Question 43

What is printed?

int[] nums = {3, 1, 4, 1, 5, 9};
int countOnes = 0;
for (int i = 0; i < nums.length; i++) {
    if (nums[i] == 1) {
        countOnes++;
    }
}
System.out.println(countOnes);

A) 1
B) 2
C) 3
D) 6

Question 44

What is printed?

int[] nums = {5, 10, 15, 20, 25};
int sum = 0;
for (int i = 0; i < nums.length; i += 2) {
    sum += nums[i];
}
System.out.println(sum);

A) 30
B) 45
C) 75
D) 50

Question 45

What is printed?

int[] nums = {4, 7, 2, 9, 1};
int minIndex = 0;
for (int i = 1; i < nums.length; i++) {
    if (nums[i] < nums[minIndex]) {
        minIndex = i;
    }
}
System.out.println(minIndex);

A) 1
B) 2
C) 4
D) 0

Question 46

What is printed?

int[] nums = {2, 4, 6, 8, 10};
boolean allGreaterThan5 = true;
for (int n : nums) {
    if (n <= 5) {
        allGreaterThan5 = false;
        break;
    }
}
System.out.println(allGreaterThan5);

A) true
B) false
C) 3
D) Error

Question 47

What is printed?

int[] nums = {1, 3, 5, 7, 9};
int target = 6;
boolean found = false;
for (int n : nums) {
    if (n == target) {
        found = true;
    }
}
System.out.println(found);

A) true
B) false
C) 6
D) -1

Question 48

What is printed?

int[] nums = {10, 20, 30};
int[] result = new int[nums.length + 1];
result[0] = 5;
for (int i = 0; i < nums.length; i++) {
    result[i + 1] = nums[i];
}
System.out.println(result[0] + " " + result[1] + " " + result[3]);

A) 5 10 30
B) 10 20 30
C) 5 10 0
D) Error

Question 49

What is printed?

int[] nums = {8, 3, 7, 1, 5};
int sumFirstLast = nums[0] + nums[nums.length - 1];
System.out.println(sumFirstLast);

A) 9
B) 11
C) 13
D) 24

Question 50

What is printed?

int[] nums = {2, 4, 6, 8, 10, 12};
int middle = nums.length / 2;
int sum = nums[middle - 1] + nums[middle];
System.out.println(sum);

A) 10
B) 12
C) 14
D) 16

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