CISC 192 Lab 3.2: Grade Analyzer Functions

Overview

In this lab, you will build a small grade analyzer program using user-defined functions.

The focus of this lab is function design. You will complete functions that calculate totals, averages, letter grades, and pass/fail status. The interactive program will call those functions, and the automated tests will verify that your functions work correctly.

Learning Goals

By completing this lab, you will practice:

• Writing user-defined functions
• Using function parameters
• Returning values from functions
• Writing void functions
• Using function prototypes in a header file
• Separating declarations and definitions
• Keeping calculation logic separate from input/output
• Running unit tests with make test

Required Features

Your program must:

• Ask the user for three assignment scores
• Calculate the total score
• Calculate the average score
• Determine the letter grade
• Determine whether the student is passing
• Print a clear grade report
• Use the required functions declared in include/grade_analyzer.hpp
• Pass the automated tests

Files You Will Edit

You should primarily edit:

• src/grade_analyzer.cpp
• src/main.cpp

Do not edit the files in tests/ unless your instructor tells you to.

Build and Run

make
./main

Run Tests

make test

Clean Build Files

make clean

Required Functions

double calculateTotal(double score1, double score2, double score3);
double calculateAverage(double total, int count);
char determineLetterGrade(double average);
bool isPassing(double average);
bool isValidScore(double score);
void printGradeReport(double total, double average, char letterGrade, bool passing);

Grade Scale

Use this grade scale:

Average	Letter Grade
90 or higher	A
80–89.999	B
70–79.999	C
60–69.999	D
Below 60	F

A student is passing if the average is 70 or higher.

Example Run

Grade Analyzer

Enter score 1: 90
Enter score 2: 85
Enter score 3: 95

Grade Report
Total: 270
Average: 90
Letter Grade: A
Status: Passing

Grading Notes

This lab is about functions. Do not put all the calculation logic directly in main().

The tests call your functions directly. Your program may appear to run, but you will not receive full credit unless the required functions return correct values.