C++ Basics Practice

Program Header and Includes

Start your program with proper structure:

• Include necessary headers: iostream, iomanip, string
• Use using namespace std; or prefix with std::
• Add a comment header with your name, date, and program description

/*
 * Student Grade Calculator
 * Author: [Your Name]
 * Date: [Submission Date]
 * Description: A program to calculate and display student grades
 */

#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

Constants Declaration

Define constants for your program:

• Maximum marks per subject (use const int MAX_MARKS = 100;)
• Number of subjects (use const int NUM_SUBJECTS = 5;)
• Grade thresholds (A: 90+, B: 80-89, C: 70-79, D: 60-69, F: below 60)

Variable Declarations

Declare appropriate variables using correct data types:

• string for student name
• int for student ID and individual subject marks
• double for average and percentage calculations
• char for letter grade

// Variable declarations
string studentName;
int studentId;
int math, science, english, history, programming;
double totalMarks, average, percentage;
char letterGrade;

User Input

Get input from the user for:

• Student name (use getline() for names with spaces)
• Student ID number
• Marks for 5 subjects: Mathematics, Science, English, History, Programming
• Include input prompts that are clear and user-friendly

cout << "Enter student name: ";
getline(cin, studentName);

cout << "Enter student ID: ";
cin >> studentId;

cout << "Enter marks for Mathematics (0-100): ";
cin >> math;

Calculations

Perform the following calculations:

• Total marks = sum of all 5 subjects
• Maximum possible marks = NUM_SUBJECTS × MAX_MARKS
• Percentage = (totalMarks / maxPossible) × 100
• Average = totalMarks / NUM_SUBJECTS
• Determine letter grade based on percentage

Grade Determination

Use conditional statements to determine the letter grade:

• A: 90% and above (Excellent)
• B: 80-89% (Good)
• C: 70-79% (Average)
• D: 60-69% (Below Average)
• F: Below 60% (Fail)

// Grade determination using if-else
if (percentage >= 90) {
    letterGrade = 'A';
} else if (percentage >= 80) {
    letterGrade = 'B';
} else if (percentage >= 70) {
    letterGrade = 'C';
} else if (percentage >= 60) {
    letterGrade = 'D';
} else {
    letterGrade = 'F';
}

Formatted Output

Display a formatted report card using iomanip:

• Use setw() for column alignment
• Use setprecision() for decimal places
• Use fixed for consistent decimal display
• Include decorative borders using characters

cout << fixed << setprecision(2);
cout << "\n========================================\n";
cout << "           STUDENT REPORT CARD          \n";
cout << "========================================\n";
cout << "Student Name: " << studentName << endl;
cout << "Student ID:   " << studentId << endl;
cout << "----------------------------------------\n";
cout << setw(15) << left << "Subject" 
     << setw(10) << right << "Marks" << endl;

Pass/Fail Status

Add logic to determine and display pass/fail status:

• A student passes if all subjects have marks >= 40
• Use logical operators (&&) to check all conditions
• Display appropriate message based on status

Additional Statistics

Calculate and display:

• Highest scoring subject
• Lowest scoring subject
• Difference between highest and lowest (range)

Code Quality

Ensure your code meets quality standards:

• Proper indentation (consistent spacing)
• Meaningful variable names
• Comments explaining each section
• No magic numbers (use constants)
• Clean, readable code structure