Question

On Lab 10 you did Chapter 8’s Programming Exercise 13, using the name Lab10TestScores and assuming that the class has ten students and five tests. Now let’s rewrite it to use dynamic arrays so that it will work for any number of students and any number of tests. Call this new program Lab11TestScores. Modify the program so that it asks the user to enter the number of students and the number of tests before it reads the data from the file named Lab11ScoresData.txt. (Two data files, Lab11ScoresData_5_3.txt and Lab11ScoresData_11_6.txt, are provided so you can use to test your program.). Let me know if you have questions. #include #include using namespace std; void readFile(string names[10], int scores[][5]) { ifstream in("Lab10ScoresData.txt"); for (int i = 0; i < 10; i++) { in >> names[i] >> scores[i][0] >> scores[i][1] >> scores[i][2] >> scores[i][3] >> scores[i][4]; } } void average(int scores[][5], float avg[], char grade[]) { int total; for (int i = 0; i < 10; i++) { total = 0; for (int j = 0; j < 5; j++) total += scores[i][j]; avg[i] = (float)total / (float)5; } for (int i = 0; i < 10; i++) { if (avg[i] >= 90) grade[i] = 'A'; if (avg[i] < 90 && avg[i] >= 80) grade[i] = 'B'; if (avg[i] < 80 && avg[i] >= 70) grade[i] = 'C'; if (avg[i] < 70 && avg[i] >= 60) grade[i] = 'D'; if (avg[i] < 60 && avg[i] >= 50) grade[i] = 'E'; if (avg[i] < 50) grade[i] = 'F'; } } void sortByName(string names[], float avg[], char grade[]) { for (int i = 0; i < 9; i++) { for (int j = i + 1; j < 10; j++) { if (names[i] > names[j]) { string n = names[i]; names[i] = names[j]; names[j] = n; float a = avg[i]; avg[i] = avg[j]; avg[j] = a; char g = grade[i]; grade[i] = grade[j]; grade[j] = g; } } } } void output(string names[], float avg[], char grade[]) { cout << "Name\tAverage\tGrade\n"; for (int i = 0; i < 10; i++) { cout << names[i] << "\t" << avg[i] << "\t" << grade[i] << endl; } } void countGrade(char grade[]) { int a = 0, b = 0, c = 0, d = 0, e = 0, f = 0; cout << "\n\nGrade\tCount\n"; for (int i = 0; i < 10; i++) { if (grade[i] == 'A') a++; if (grade[i] == 'B') b++; if (grade[i] == 'C') c++; if (grade[i] == 'D') d++; if (grade[i] == 'E') e++; if (grade[i] == 'F') f++; } cout << "A\t" << a << endl; cout << "B\t" << b << endl; cout << "C\t" << c << endl; cout << "D\t" << d << endl; cout << "E\t" << e << endl; cout << "F\t" << f << endl; } int main() { string names[10]; int scores[10][5]; float avg[10]; char grade[10]; readFile(names, scores); average(scores, avg, grade); sortByName(names, avg, grade); output(names, avg, grade); countGrade(grade); system(" pause "); return 0; }

Lab11ScoresData_11_6.txt.

Johnson 85 83 77 91 76 99
Aniston 80 90 95 93 48 100
Cooper 78 81 11 90 73 54
Gupta 92 83 30 69 87 78
Blair 23 45 96 38 59 82
Clark 60 85 45 39 67 67
Kennedy 77 31 52 74 83 77
Bronson 93 94 89 77 97 80
Sunny 79 85 28 93 82 45
Smith 85 72 49 75 63 92
Groot 90 87 94 75 100 100

Lab11ScoresData_5_3.txt

Johnson 85 83 77
Aniston 80 90 95
Cooper 78 81 11
Gupta 92 83 30
Blair 23 45 96

Answer 1

If you have any doubts, please give me comment...

#include <iostream>

#include <fstream>

using namespace std;

void readFile(string *names, int **scores, int num_studs, int num_tests)

{

    ifstream in("Lab11ScoresData.txt");

    for (int i = 0; i < num_studs; i++)

    {

        in >> names[i];

        for(int j=0; j<num_tests; j++)

            in>>scores[i][j];

    }

}

void average(int **scores, int num_studs, int num_tests, float *avg, char *grade)

{

    int total;

    for (int i = 0; i < num_studs; i++)

    {

        total = 0;

        for (int j = 0; j < num_tests; j++)

            total += scores[i][j];

        avg[i] = (float)total / (float)num_tests;

    }

    for (int i = 0; i < num_studs; i++)

    {

        if (avg[i] >= 90)

            grade[i] = 'A';

        if (avg[i] < 90 && avg[i] >= 80)

            grade[i] = 'B';

        if (avg[i] < 80 && avg[i] >= 70)

            grade[i] = 'C';

        if (avg[i] < 70 && avg[i] >= 60)

            grade[i] = 'D';

        if (avg[i] < 60 && avg[i] >= 50)

            grade[i] = 'E';

        if (avg[i] < 50)

            grade[i] = 'F';

    }

}

void sortByName(string *names, int num_studs, float *avg, char *grade)

{

    for (int i = 0; i < num_studs-1; i++)

    {

        for (int j = i + 1; j < num_studs; j++)

        {

            if (names[i] > names[j])

            {

                string n = names[i];

                names[i] = names[j];

                names[j] = n;

                float a = avg[i];

                avg[i] = avg[j];

                avg[j] = a;

                char g = grade[i];

                grade[i] = grade[j];

                grade[j] = g;

            }

        }

    }

}

void output(string *names, int num_studs, float *avg, char *grade)

{

    cout << "Name\tAverage\tGrade\n";

    for (int i = 0; i < num_studs; i++)

    {

        cout << names[i] << "\t" << avg[i] << "\t" << grade[i] << endl;

    }

}

void countGrade(char *grade, int num_studs)

{

    int a = 0, b = 0, c = 0, d = 0, e = 0, f = 0;

    cout << "\n\nGrade\tCount\n";

    for (int i = 0; i < 10; i++)

    {

        if (grade[i] == 'A')

            a++;

        if (grade[i] == 'B')

            b++;

        if (grade[i] == 'C')

            c++;

        if (grade[i] == 'D')

            d++;

        if (grade[i] == 'E')

            e++;

        if (grade[i] == 'F')

            f++;

    }

    cout << "A\t" << a << endl;

    cout << "B\t" << b << endl;

    cout << "C\t" << c << endl;

    cout << "D\t" << d << endl;

    cout << "E\t" << e << endl;

    cout << "F\t" << f << endl;

}

int main()

{

    int num_studs, num_tests;

    cout<<"Enter number of students: ";

    cin>>num_studs;

    cout<<"Enter number of tests: ";

    cin>>num_tests;

    string *names = new string[num_studs];

    int **scores = new int*[num_studs];

    for(int i=0; i<num_studs; i++)

        scores[i] = new int[num_tests];

    float *avg = new float[num_studs];

    char *grade = new char[num_studs];

    readFile(names, scores, num_studs,num_tests);

    average(scores, num_studs, num_tests, avg, grade);

    sortByName(names, num_studs, avg, grade);

    output(names, num_studs, avg, grade);

    countGrade(grade, num_studs);

    // system(" pause ");

    return 0;

}