WEEK 13 · LAB 5

Lab 5 — Objects and Classes

Create two student objects and display their information.

I. Objectives

Use a class to group a student's name and score.
Initialize an object with a constructor and call a member function.

Before the Lab

Week 12: std::string, public and private members, constructors, and const member functions. A constructor sets up an object; show() const displays its data without changing its data members.

II. Environment

A computer with Windows, macOS, or Linux.
Use OnlineGDB in C++ mode, or the C++ environment demonstrated in class.
Save your program as lab05.cpp. Use one source file for this lab.

Open OnlineGDB ↗

III. Tasks and Requirements

Complete the TODOs in the starter code, then compare your result with the expected output. The starter is intentionally unfinished.

Task 1 — Read the Student class

Find the private data members name and score. Find the constructor and show(). Run the starter; it will not display student information until the TODOs are completed.

Task 2 — Complete the constructor and show()

At TODO 1, assign studentName to name and studentScore to score. At TODO 2, print the name and score on one line, as shown below.

Task 3 — Test two independent objects

Run the program for Alex (85) and Sam (92). Then change only Sam's score to 70 and run it again. Alex's score should still be 85.

Starter Code

Download .cpp

#include <iostream>
#include <string>

class Student {
private:
    std::string name;
    int score = 0;

public:
    Student(std::string studentName, int studentScore) {
        // TODO 1: Set name and score.
    }

    void show() const {
        // TODO 2: Print name and score.
    }
};

int main() {
    Student first("Alex", 85);
    Student second("Sam", 92);
    first.show();
    second.show();
    return 0;
}

Expected Output

Expected output after completing both TODOs.

Alex 85
Sam 92

IV. Lab Report Submission

Submit one lab report for this lab, in English or Chinese. Include the following content in the report.

Student information: name, student ID, class, lab number, and lab title.
Objectives and environment: briefly describe the lab objectives and the C++ environment you used.
Procedure and code: explain how you completed the tasks and include the complete code from lab05.cpp in the report.
Tests and results: record the test inputs and results, include one or two screenshots, and explain whether the results match the expected output.
Answers and reflection: answer the two questions below and briefly describe what you learned or a problem you solved.

Questions for the Report

When is the Student constructor called?
Why can first and second store different scores?