#include <iostream>
#include <string>
using namespace std;
 
int main()
{
    const int students = 5;
	const int grades = 5;
	const int testScores = 4;
 
	char letter[testScores];
	string name[students];
	double scores1[testScores];
	double scores2[testScores];
	double scores3[testScores];
	double scores4[testScores];
 
	cout << "Gradebook Program" << endl;
	cout << "-----------------" << endl;
	cout << "Enter the students name and grade for each test." << endl;
 
	for (int index = 0; index < students; index++)
	{
		cout << "Student " << (index+1) << "'s name is: " << endl;
		cin >> name[index];
		cout << "Grade for test 1 is: " << endl;
		cin >> scores1[index];
		cout << "Grade for test 2 is: " << endl;
		cin >> scores2[index];
		cout << "Grade for test 3 is: " << endl;
		cin >> scores3[index];
		cout << "Grade for test 4 is: " << endl;
		cin >> scores4[index];
	}
 
	for (int index = 0; index < students; index++)
	{
		char letterGrade = letter[index];
		double overallScore = ( (scores1[index] + scores2[index] + scores3[index] + scores4[index]) / 4);
 
		if (overallScore >= 90)
		{
			letterGrade = 'A';
		}
		else if (overallScore >= 80 && overallScore <=89)
		{
			letterGrade = 'B';
		}
		else if (overallScore >= 70 && overallScore <=79)
		{
			letterGrade = 'C';
		}
		else if (overallScore >=60 && overallScore <=69)
		{
			letterGrade = 'D';
		}
		else
		{
			letterGrade = 'F';
		}
 
		cout << name[index] << "'s average test score is " << overallScore << endl;
		cout << " " << endl;
		cout << name[index] << "'s letter grade is  " << letterGrade << endl;
		cout << " " << endl;
	}
 
	return 0;
}

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Alice
1
2
3
4
Bob
1
2
3
4
Charlie
1
2
3
4
David
1
2
3
4
Eliza
1
2
3
4