Mindtap9_2

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

using namespace std;

struct studentType {

    string studentFName;
    string studentLName;
    int testScore;
    char grade;
};

void getData(studentType students[]); //A function to read the students’ data into the array.

void assignGrade(studentType students[]); //A function to assign the relevant grade to each student.

int highScore(studentType students[], int& topGun, int n); //A function to find the highest test score.

void leaderboard(studentType students[], int& topGun, string& studentLeaderboard); //A function to print the names of the students having the highest test score.

void outputData(studentType students[], int& topGun, string& studentLeaderboard); //A function to print the data.

int main()
{

    studentType students[20];
    string studentLeaderboard;
    int n = 20;
    int topGun = 0;

    getData(students);
    assignGrade(students);
    highScore(students, topGun, n);
    leaderboard(students, topGun, studentLeaderboard);
    outputData(students, topGun, studentLeaderboard);

    return 0;
};

void getData(studentType students[])
{
    ifstream infile;
    infile.open("Ch9_Ex2Data.txt");

    for (int i = 0; i < 20; i++) {
        infile >> students[i].studentFName
            >> students[i].studentLName
            >> students[i].testScore;
    }
    infile.close();
};

void assignGrade(studentType students[])
{

    for (int i = 0; i < 20; i++) {
        if (students[i].testScore >= 92)
            students[i].grade = 'A';
        else if (students[i].testScore >= 85 && students[i].testScore < 92)
            students[i].grade = 'B';
        else if (students[i].testScore >= 78 && students[i].testScore < 85)
            students[i].grade = 'C';
        else if (students[i].testScore >= 70 && students[i].testScore < 78)
            students[i].grade = 'D';
        else if (students[i].testScore < 70)
            students[i].grade = 'F';
    }
};

int highScore(studentType students[], int& topGun, int n)
{
    int pos_max;

    for (int i = 0; i < n - 1; i++) {
        pos_max = i; //set pos_max to the current index of array

        for (int j = i + 1; j < n; j++) {

            if (students[j].testScore > students[pos_max].testScore)
                pos_max = j;
            //pos_max will keep track of the index that max is in, this is needed when a swap happens
        }

        //if pos_max no longer equals i then a larger value must have been found, so a swap must occur
        if (pos_max != i) {
            studentType temp = students[i];
            students[i] = students[pos_max];
            students[pos_max] = temp;
        }
    }
    topGun = students[0].testScore;
    return topGun;
};

void leaderboard(studentType students[], int& topGun, string& studentLeaderboard)

{

    for (int i = 0; i < 20; i++) {

        if (students[i].testScore == topGun)
            studentLeaderboard += students[i].studentFName + ' ' + students[i].studentLName + ',' + ' ';
    }
};

void outputData(studentType students[], int& topGun, string& studentLeaderboard)
{
    ofstream outfile;

    outfile.open("Ch9_Ex2Out.txt");

    for (int i = 0; i < 20; i++) {
        outfile << students[i].studentLName
                << ", "
                << students[i].studentFName
                << ' '
                << students[i].testScore
                << ' '
                << students[i].grade
                << endl;
    }

    outfile << "The highest test score is: " << topGun << endl;
    outfile << "The student(s) who achieved this grade are: " << studentLeaderboard << endl;
    outfile.close();
};