The Brooklyn College PACS, LLC x Ogbonnayajrakpara, LLC

#include <iostream>

#include <cstdlib>

#include <cmath>

#include <fstream>

#include <string>

#include <iomanip>

using namespace std;

const int size=100;

struct studentData {

string studentFirstName; //stores student's first name

string studentLastname; //stores student's last name

int examGrade; //stores student's exam grades

char letterGrade; //stores student's letter grade

};

studentData student [size]; //sets an array called student of the type StudentData

void getData (int listSize, studentData sList [], ifstream &);

void calculatedGrade (studentData sList[], int listSize);

int highestScore (const studentData slist[], int listSize);

void printStudentNameResult (const studentData sList [], int listSize);

double average (studentData student[], int n);

double standardDeviation (studentData students [], int n, double avg);

int main () {

ifstream inFile;

inFile.open("student.txt");

if (!inFile) {

cerr << "Error opening file." << endl;

exit (1);

}

int n=getData (ifstream, student);

calculatedGrade (student, n);

printStudentNameResult (student, n);

int index=highestScore (student, n);

cout << "The student with the highest score is:" << student[index].studentFirstName << " " << student[index].studentLastName << endl;

double avg= average (student, n);

cout << "The average grade in the class is:" << avg << endl;

double SD= standardDeviation (student, n, avg);

cout << "The Standard deviation was:" << SD << endl;

return 0;

}

int getData (ifstream & inData, studentData student []) {

int i=0;

inData >> student[i].studentFirstName;

while (i < 100 && !inFile.eof()) {

inData >> student[i].studentLastName;

inData >> student[i].examGrade;

i++;

inData >> student[i].studentFirstName;

}

return i; // i is the number of students

}

void calculatedGrade (studentData student [], int n) {

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

if (student[i].examGrade >= 90) 

student[i].letterGrade = 'A'; 

else if (student[i].examGrade >= 80)

student[i].letterGrade = 'B';

else if (student[i].examGrade >= 70)

student[i].letterGrade = 'C';

else if (student[i].examGrade <= 60)

student[i].letterGrade = 'F';

}

}

void printStudentNameResult (studentData student [], int n) {

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

cout << student[i].studentFirstName << " " << student[i].studentLastName << " " << student[i].letterGrade << endl;

}

}

int highestScore (studentData student [], int n) {

int highestTest= student[0].examGrade;

int index=0;

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

if(student[i].examGrade > highestTest) {

highestTest=student[i].examGrade;

index=i;

}

}

return index;

}

double average (studentData student[], int n) {

int sum=0;

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

sum+=student[i].examGrade;

}

double average = double (sum)/n;

return average;

}

double standardDeviation (studentData students [], int n, double avg) {

int sum=0;

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

pow (student[i].examGrade-avg, 2);

}

double result= double(sum)/(n-1);

result= sqrt (result);

return result;

}