Programming!

Based on the images provided, here is the verbatim transcription of the content on the slides from Universiti Malaya.

Slide 1: Revision (Part B) - 2

You are helping a bookstore create a simple C++ program to calculate customer bills. The store offers a 10% discount for purchases over RM100. To keep the program modular and organized, the store wants to use subfunctions:

• A non-void function to calculate the discount amount
• A void function to display the final bill Task: Write a complete C++ program that does the following:

1. Ask the user to enter:

• Customer name
• Total amount of purchase (before discount)

2. Use a non-void function named calculateDiscount(double amount) that:

• Returns 10% of the amount if it's more than RM100
• Returns 0 otherwise

3. Use a void function named displayBill(string name, double total, double discount) that:

• Displays the customer name
• Displays the original amount
• Displays the discount and final amount after discount

4. All values are passed by value

Slide 2: Logic and Flowchart Task

Highlights:

• calculateDiscount() is a non-void function that returns a double value.
• displayBill() is a void function that takes all data by value and formats the output.
• This program clearly separates processing and output logic for better modularity. Draw the flowchart for the program.

1. Start
2. Input data
3. Check condition (amount > 100)
4. Calculate discount
5. Calculate final amount
6. Display output
7. End

Slide 3: Code Implementation (Functions)

#include <iostream>
#include <iomanip> // for fixed and setprecision
using namespace std;

// Non-void function: calculates discount
double calculateDiscount(double amount) {
    if (amount > 100)
        return amount * 0.10; // 10% discount
    else
        return 0.0;
}

// Void function: displays the bill
void displayBill(string name, double total, double discount) {
    double finalAmount = total - discount;

    cout << "\nCustomer Name: " << name << endl;
    cout << fixed << setprecision(2);
    cout << "Original Amount: RM" << total << endl;
    cout << "Discount: RM" << discount << endl;
    cout << "Final Amount: RM" << finalAmount << endl;
}

Slide 4: Code Implementation (Main)

int main() {
    string customerName;
    double totalAmount;

    // Input
    cout << "Enter customer name: ";
    getline(cin, customerName);

    cout << "Enter total purchase amount: ";
    cin >> totalAmount;

    // Process
    double discount = calculateDiscount(totalAmount);

    // Output
    displayBill(customerName, totalAmount, discount);

    return 0;
}

Slide 5: Revision (Part B) - 3

You are developing a simple program for a mathematics learning system. The program calculates the factorial of a number entered by the user using recursion. To keep the program modular, the system uses two subfunctions:

• A non-void recursive function to calculate the factorial
• A void function to display the result Task:
• Write a complete C++ program that:
• Asks the user to enter a positive integer
• Uses a recursive function named calculateFactorial(int n) to:
  • Return the factorial of the number
• Uses a function named displayResult(int n, int result) to:
  • Display the number entered
  • Display the factorial result Enter a positive integer: 10 Factorial of 10 = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 = 3628800

Slide 6: Recursive Code Implementation

#include <iostream>
using namespace std;

// Subfunction 1: Recursive calculation
int calculateFactorial(int n) {
    if (n == 0 || n == 1)
        return 1;
    return n * calculateFactorial(n - 1);
}

// Subfunction 2: Display function
void displayResult(int n, int result) {
    cout << "Factorial of " << n << " = ";

    for (int i = 1; i <= n; i++) {
        cout << i;
        if (i < n)
            cout << " x ";
    }
    cout << " = " << result << endl;
}

int main() {
    int num;
    cout << "Enter a positive integer: ";
    cin >> num;
    int factorial = calculateFactorial(num);
    displayResult(num, factorial);
    return 0;
}

Slide 7: Revision (Part B) - Students' Test Scores

A university department maintains records of students' test scores across several subjects. Write a C++ program that processes the student scores according to the following requirements: Requirements:

1. The program shall first prompt the user to enter:

• The number of students
• The number of subjects

2. Based on these values, dynamically allocate memory to store the scores using a two-dimensional array implemented with pointers.
3. The program shall then read the scores (in marks) for each student across all subjects.
4. Important: All data must be stored and accessed strictly using pointer notation only.
5. Subsequently, the program shall compute, for each student:

• The total score
• The average score

6. Each student shall be classified based on their average score: | Average Score | Category | |---|---| | \ge 80 | Excellent | | 50 - 79 | Pass | | < 50 | Fail |

Slide 8: Example Output (Students)

Example Output: Student 1: 70 80 90 | Total = 240 | Average = 80 | Excellent Student 2: 40 50 60 | Total = 150 | Average = 50 | Pass

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