Java Assessment | The British International School

Candidate Name

Class

Date

Instructions.

Answer all questions. The marks for each question are shown in brackets.
All code must be written in Java, using BufferedReader br for input.
Work on your own. Use of an IDE, notes or the internet is not permitted.
Press Start Assessment to begin the 45-minute timer.
When you finish (or when time is called), press Finish & Save as PDF and choose “Save as PDF” to submit.

Multiple Choice

12 marks

Select the one correct answer. (1 mark each)

A1. What does Integer.parseInt(br.readLine()) do? [1]

a) Reads a line and leaves it as a String b) Reads a line and converts it to an int c) Reads a single character d) Prints a number to the screen

A2. Output of System.out.println(17 % 5); [1]

a) 3 b) 2 c) 3.4 d) 12

A3. Output of System.out.println(17 / 5); [1]

a) 3 b) 3.4 c) 2 d) 4

A4. How many elements are in int[] t = {29, 31, 30, 28};? [1]

a) 3 b) 4 c) 5 d) 28

A5. Which condition is true when num is even? [1]

a) num / 2 == 0 b) num % 2 == 1 c) num % 2 == 0 d) num % 2 != 0

A6. Inside a loop, what does i++ do? [1]

a) Decreases i by 1 b) Increases i by 1 c) Doubles i d) Resets i to 0

A7. For a 5-element array, for(int i=0; i<arr.length; i++) visits indexes: [1]

a) 1 to 5 b) 0 to 5 c) 0 to 4 d) 1 to 4

A8. Which keyword prevents a value from being changed? [1]

a) static b) const c) final d) fixed

A9. To check a balance is enough to withdraw an amount, the condition is: [1]

a) amount <= balance b) amount > balance c) balance < amount d) amount == balance

A10. Which loop is guaranteed to run at least once? [1]

a) for b) while c) do...while d) if

A11. What is printed? int x=4; if(x>2 && x<10) ... "yes" ... else ... "no" [1]

a) yes b) no c) 4 d) nothing

A12. Which statement keeps a running total? [1]

a) total = value; b) total = total + value; c) total + value; d) total == total + value;

True or False

6 marks

Decide whether each statement is true or false. (1 mark each)

B1. Integer.parseInt("12.5") works and gives 12.T F[1]

B2. if (x = 5) correctly compares x with 5 in Java.T F[1]

B3. In a do...while loop, the body runs before the condition is checked.T F[1]

B4. An array of size 6 has valid indexes 0 to 5.T F[1]

B5. total = total + arr[i]; is an example of totalling.T F[1]

B6. The operator && means OR.T F[1]

Predict the Output

8 marks

State exactly what each program prints. (2 marks each)

C1. [2]

int sum = 0;
for (int i = 1; i <= 4; i++) {
    sum = sum + i;
}
System.out.println(sum);

C2. [2]

int[] a = {3, 7, 2, 9, 5};
System.out.println(a[1] + a[3]);

C3. [2]

int count = 0;
int[] nums = {12, 5, 18, 3, 20};
for (int i = 0; i < nums.length; i++) {
    if (nums[i] > 10) {
        count++;
    }
}
System.out.println(count);

C4. [2]

int n = 3;
for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= i; j++) {
        System.out.print(j);
    }
    System.out.println();
}

Find the Error

8 marks

Each snippet has a mistake. State the error and the correction. (2 marks each)

D1. [2]

if (denominator = 0) {
    System.out.println("Division by zero is not allowed.");
}

D2. [2]

for (int i = 1; i = rows; i +) {
    System.out.println(i);
}

D3. [2]

int[] sales = {95, 120, 85};
for (int i = 1; i <= sales.length; i++) {
    System.out.println(sales[i]);
}

D4. [2]

int i = 1;
do {
    System.out.println(i);
    i++;
} while (i = 5);

Programming

16 marks

Write complete Java programs using BufferedReader br for input. (8 marks each)

E1. Discount Calculation System. Read a purchase amount, then apply a discount:
• amount ≥ 5000 → 20% discount;
• amount 2000–4999 → 10% discount;
• otherwise → no discount.
Print the final amount the customer must pay. [8]

E2. Daily Temperature Tracker. Read the temperatures for 7 days into an array, then display the highest temperature and the average temperature for the week. [8]