I am suppost to have 3 functions in the program. It works fantastic, but the pro

Question

 

 

I am suppost to have 3 functions in the program.  It works fantastic, but the problem states that I need 3 function which are: 1. a function to read and store data into two arrays.2. a function to calculate the average test score and grade. 3. and a function to output the results.  My instructor says I only have two of these.  I need the function that I am missing in this program without messing up the actual output results because it is already correct. Can you please modify?

 

 

 

 

 

//Header files
#include<iostream>
#include<fstream>
#include<iomanip>
#include<string>
#include<math.h>

//namespace statement.
using namespace std;

// Theses are function prototypes
void calculateAverage(ifstream& _inFile, ofstream& _outFile, double& _runningAverage);
char calculateGrade( double _grade);
const int numTests = 5;
int main()
{
// Declaring Variables
int count = 0;
double runningAverage =0.0;
string studentName;
// Declaring stream files
ifstream inFile;
ofstream outFile;
// opens the input file
inFile.open ("ch9_Ex13Data.txt");
// Display an error if the input file does not open.
if ( !inFile.is_open() )
{
//Terminates the program
cout << "Error in opening file.";
cout << "Program terminates." << endl;
return 1;
}
// Opens the output file
outFile.open ("Ch9_Ex13Out.txt");

//align the names to the left
cout.setf(ios::left);
cout << fixed << showpoint << setprecision (2);
cout << setw(10) << "Name" << setw(9);
cout.unsetf(ios::left);
//align the test headings to the right
cout.setf(ios::right);
cout << "Test 1" << setw(8) << "Test 2" << setw(8) << "Test 3" << setw(8) <<"Test 4" << setw(8) << "Test 5" << setw(11) << "Average" << setw(8) << "Grade" << endl;
//align the names to the left
outFile.setf(ios::left);
outFile << fixed << showpoint << setprecision (2);
outFile << setw(10) << "Name" << setw(9);
//align the test headings to the right
outFile.setf(ios::right);
outFile << "Test 1" << setw(8) << "Test 2" << setw(8) << "Test 3" << setw(8) <<"Test 4" << setw(8) << "Test 5" << setw(11) << "Average" << setw(8) << "Grade" << endl;
// Read and write a students name from the input file
inFile >> studentName;
while(inFile)
{
count++;
cout.unsetf(ios::right);
//align the names to the left
cout.setf(ios::left);
cout << setw(10) << studentName << setw(9);

outFile.unsetf(ios::right);
//align the names to the left
outFile.setf(ios::left);
outFile << setw(10) << studentName << setw(9);
calculateAverage(inFile, outFile, runningAverage);
inFile >> studentName;
}
cout << " Class average: " << (runningAverage/count) << endl << endl;;
outFile << " Class average: " << (runningAverage/count) << endl << endl;
//Close file Streams
inFile.close ();
outFile.close ();
system("pause");
return 0;
}
// average the test scores for each student
// Read and write a students test scores
void calculateAverage(ifstream& _inFile, ofstream& _outFile, double& _runningAverage)
{
double testsTotal = 0;
double test = 0;
double testsAverage = 0.0;
cout.unsetf(ios::left);
cout.setf(ios::right); //align the tests to the right
cout << fixed << showpoint << setprecision (2);

_outFile.unsetf(ios::left);
_outFile.setf(ios::right); //align the tests to the right
_outFile << fixed << showpoint << setprecision (2);
for(int i=0; i < numTests; i++)
{
_inFile >> test;
testsTotal += test;
cout << test << setw(8);
_outFile << test << setw(8);
}
testsAverage = testsTotal / numTests;
_runningAverage += testsAverage;
cout << setw(11) << testsAverage;
cout << setw(6) << calculateGrade(testsAverage) << endl;
_outFile << setw(11) << testsAverage;
_outFile << setw(6) << calculateGrade(testsAverage) << endl;
}
// determines and returns the students letter grade
char calculateGrade (double _grade)
{
if (_grade < 60)
return 'F';
else if (_grade < 70)
return 'D';
else if (_grade < 80)
return 'C';
else if (_grade < 90)
return 'B';
else
return 'A';
}

 

Explanation / Answer

I wrote assuming that the number of tests and students were constant, if they aren't you have to use dynamic arrays and pointers so i don't know if that's too advanced for what you're working on at the moment //Header files #include<iostream> #include<fstream> #include<iomanip> #include<string> #include<math.h> //namespace statement. using namespace std; const int numTests = 5; const int numStudents = 10; // Theses are function prototypes void getData(ifstream &inFile, string names[numStudents], double tests[numStudents][numTests + 1]); //#1  double calculateAverage(double tests[]); //#2 char getLetterGrade(double grade); void printtests(ofstream &outFile, string names[numStudents], double tests[numStudents][numTests + 1], double classAverage); //#3 int main() {   // Declaring stream files   ifstream inFile;   inFile.open ("ch9_Ex13Data.txt");    // opens the input file   ofstream outFile;   outFile.open ("Ch9_Ex13Out.txt");     // Opens the output file   string names[numStudents];   double tests[numStudents][numTests + 1];   //declaring arrays   if(!inFile.is_open())   {     //Terminates the program     cout << "Error in opening file.";     cout << "Program terminates." << endl;     return 1;   }  // Display an error if the input file does not open.   getData(inFile, names, tests); //gets data into arrays   // Declaring Variables   double runningAverage = 0.0, classAverage = 0.0;   for(int i = 0; i < numStudents; i++)   {     tests[i][numTests] = calculateAverage(tests[i]); //storing the average in the last element of the tests array     runningAverage += tests[i][numTests]; //adds up all the averages from students   }   classAverage = runningAverage / numStudents; //calcs class average   printtests(outFile, names, tests, classAverage); //prints results   system("pause");   return 0; } //reads in student test tests and name void getData(ifstream &inFile, string names[numStudents], double tests[numStudents][numTests + 1]) {   for(int i = 0; i < numStudents; i++)   {     inFile >> names[i]; //gets name     for(int j = 0; j < numTests ; j++)     {       inFile >> tests[i][j]; //gets test tests     }   }   inFile.close (); //closing data file } // average the test tests for the student double calculateAverage(double tests[numTests]) {   double total = 0;   double average = 0.0;   for(int i = 0; i < numTests; i++)   {     total += tests[i]; //gets test tests and adds to running total   }   average = total / numTests; //calcs the average   return average; //returns the average } // determines and returns the students letter grade char getLetterGrade(double grade) {   if (grade < 60)     return 'F';   else if (grade < 70)     return 'D';   else if (grade < 80)     return 'C';   else if (grade < 90)     return 'B';   else     return 'A'; } void printtests(ofstream &outFile, string names[numStudents], double tests[numStudents][numTests + 1], double classAverage) {   //align the names to the left   cout.setf(ios::left);   cout << fixed << showpoint << setprecision (2);   cout << setw(10) << "Name" << setw(9);   cout.unsetf(ios::left);   //align the test headings to the right   cout.setf(ios::right);   cout << "Test 1" << setw(8) << "Test 2" << setw(8) << "Test 3" << setw(8) <<"Test 4" << setw(8) << "Test 5" << setw(11) << "Average" << setw(8) << "Grade" << endl;   //align the names to the left   outFile.setf(ios::left);   outFile << fixed << showpoint << setprecision (2);   outFile << setw(10) << "Name" << setw(9);   //align the test headings to the right   outFile.setf(ios::right);   outFile << "Test 1" << setw(8) << "Test 2" << setw(8) << "Test 3" << setw(8) <<"Test 4" << setw(8) << "Test 5" << setw(11) << "Average" << setw(8) << "Grade" << endl;   // Read and write a students name from the input file   for(int i = 0; i < numStudents; i++)   {     cout.unsetf(ios::right);     cout.setf(ios::left); //align the names to the left     cout << setw(10) << names[i] << setw(9);     cout.unsetf(ios::left);     cout.setf(ios::right); //align the tests to the right     cout << fixed << showpoint << setprecision (2);     outFile.unsetf(ios::right);     outFile.setf(ios::left);  //align the names to the left     outFile << setw(10) << names[i] << setw(9);     outFile.unsetf(ios::left);     outFile.setf(ios::right); //align the tests to the right     outFile << fixed << showpoint << setprecision (2);          for(int j = 0; j < numTests + 1; j++)     {       if(j == numTests) //if it's time to print the average of the tests, needs special formatting       {         cout << setw(11) << tests[i][j];         cout << setw(6) << getLetterGrade(tests[i][j]) << endl;         outFile << setw(11) << tests[i][j];         outFile << setw(6) << getLetterGrade(tests[i][j]) << endl;       }       else //otherwise just print the test score       {         cout << tests[i][j] << setw(8);         outFile << tests[i][j] << setw(8);       }     }   }   cout << " Class average: " << classAverage << endl << endl;;   outFile << " Class average: " << classAverage << endl << endl; //class average   outFile.close (); //closing output file   } I wrote assuming that the number of tests and students were constant, if they aren't you have to use dynamic arrays and pointers so i don't know if that's too advanced for what you're working on at the moment //Header files #include<iostream> #include<fstream> #include<iomanip> #include<string> #include<math.h> //namespace statement. using namespace std; const int numTests = 5; const int numStudents = 10; // Theses are function prototypes void getData(ifstream &inFile, string names[numStudents], double tests[numStudents][numTests + 1]); //#1  double calculateAverage(double tests[]); //#2 char getLetterGrade(double grade); void printtests(ofstream &outFile, string names[numStudents], double tests[numStudents][numTests + 1], double classAverage); //#3 int main() {   // Declaring stream files   ifstream inFile;   inFile.open ("ch9_Ex13Data.txt");    // opens the input file   ofstream outFile;   outFile.open ("Ch9_Ex13Out.txt");     // Opens the output file   string names[numStudents];   double tests[numStudents][numTests + 1];   //declaring arrays   if(!inFile.is_open())   {     //Terminates the program     cout << "Error in opening file.";     cout << "Program terminates." << endl;     return 1;   }  // Display an error if the input file does not open.   getData(inFile, names, tests); //gets data into arrays   // Declaring Variables   double runningAverage = 0.0, classAverage = 0.0;   for(int i = 0; i < numStudents; i++)   {     tests[i][numTests] = calculateAverage(tests[i]); //storing the average in the last element of the tests array     runningAverage += tests[i][numTests]; //adds up all the averages from students   }   classAverage = runningAverage / numStudents; //calcs class average   printtests(outFile, names, tests, classAverage); //prints results   system("pause");   return 0; } //reads in student test tests and name void getData(ifstream &inFile, string names[numStudents], double tests[numStudents][numTests + 1]) {   for(int i = 0; i < numStudents; i++)   {     inFile >> names[i]; //gets name     for(int j = 0; j < numTests ; j++)     {       inFile >> tests[i][j]; //gets test tests     }   }   inFile.close (); //closing data file } // average the test tests for the student double calculateAverage(double tests[numTests]) {   double total = 0;   double average = 0.0;   for(int i = 0; i < numTests; i++)   {     total += tests[i]; //gets test tests and adds to running total   }   average = total / numTests; //calcs the average   return average; //returns the average } // determines and returns the students letter grade char getLetterGrade(double grade) {   if (grade < 60)     return 'F';   else if (grade < 70)     return 'D';   else if (grade < 80)     return 'C';   else if (grade < 90)     return 'B';   else     return 'A'; } void printtests(ofstream &outFile, string names[numStudents], double tests[numStudents][numTests + 1], double classAverage) {   //align the names to the left   cout.setf(ios::left);   cout << fixed << showpoint << setprecision (2);   cout << setw(10) << "Name" << setw(9);   cout.unsetf(ios::left);   //align the test headings to the right   cout.setf(ios::right);   cout << "Test 1" << setw(8) << "Test 2" << setw(8) << "Test 3" << setw(8) <<"Test 4" << setw(8) << "Test 5" << setw(11) << "Average" << setw(8) << "Grade" << endl;   //align the names to the left   outFile.setf(ios::left);   outFile << fixed << showpoint << setprecision (2);   outFile << setw(10) << "Name" << setw(9);   //align the test headings to the right   outFile.setf(ios::right);   outFile << "Test 1" << setw(8) << "Test 2" << setw(8) << "Test 3" << setw(8) <<"Test 4" << setw(8) << "Test 5" << setw(11) << "Average" << setw(8) << "Grade" << endl;   // Read and write a students name from the input file   for(int i = 0; i < numStudents; i++)   {     cout.unsetf(ios::right);     cout.setf(ios::left); //align the names to the left     cout << setw(10) << names[i] << setw(9);     cout.unsetf(ios::left);     cout.setf(ios::right); //align the tests to the right     cout << fixed << showpoint << setprecision (2);     outFile.unsetf(ios::right);     outFile.setf(ios::left);  //align the names to the left     outFile << setw(10) << names[i] << setw(9);     outFile.unsetf(ios::left);     outFile.setf(ios::right); //align the tests to the right     outFile << fixed << showpoint << setprecision (2);          for(int j = 0; j < numTests + 1; j++)     {       if(j == numTests) //if it's time to print the average of the tests, needs special formatting       {         cout << setw(11) << tests[i][j];         cout << setw(6) << getLetterGrade(tests[i][j]) << endl;         outFile << setw(11) << tests[i][j];         outFile << setw(6) << getLetterGrade(tests[i][j]) << endl;       }       else //otherwise just print the test score       {         cout << tests[i][j] << setw(8);         outFile << tests[i][j] << setw(8);       }     }   }   cout << " Class average: " << classAverage << endl << endl;;   outFile << " Class average: " << classAverage << endl << endl; //class average   outFile.close (); //closing output file   }

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