Question

Please help!! I am supposed to write a program in C++ about student & grades.

Needs to have two functions that sorts students letter grade, and another one to sort Students name in your student’s record project. Remember, to add necessary parameters and declaration in main to call each function properly. Order of functions call are as follow

• Read Data
• Find Total
• Find average
• Find letter grade
• Call display function
• Call sort letter grade function
• Call display function
• Call sort students name function
• Call display function for the last time.

THIS IS WHAT I HAVE SO FAR:

(im missing the sorting & search functions, [i need to have a header function and then call them from the main)

#include
#include
#include
#include
#include

using namespace std;

const int row = 10;
const int col = 7;  

ifstream name;
ifstream grade;
ofstream out;

void readData(string stname[row], int stgrade[row][col]);
void stsum(int stgrade[row][col], int total[row]);
void staverage(int total[row], double average[row]);
void stlettergrade(double average[row],char ltrgrade[row]);
void displayData(string stname[row], int stgrade[row][col], int total[row], double staverage[row], char ltrgrade[row]);

int main()
{
   int STG[row][col] = { {0},{0} };
   string STN[row] = {};
   int STT[row] = { 0 };
   double STA[row] = { 0.0 };
   char STLG[row] = {};
  

   readData(STN,STG);
   stsum(STG, STT);
   staverage(STT, STA);
   stlettergrade(STA, STLG);
   displayData(STN, STG, STT,STA, STLG);

  

  
   name.close();
   grade.close();
   out.close();

   system("pause");

   return 0;
}
//========================Function to Read Data===================================
void readData(string stname[row], int stgrade[row][col])
{
   name.open("Name.txt");
   grade.open("Grade.txt");

   int r, c;
   for (r = 0; r < row; r++)
   {
       getline(name, stname[r]);
       for (c = 0; c < col; c++)
       {
           grade >> stgrade[r][c];
       }
   }
}
//==================Funtion for Grade Total======================================
void stsum(int stgrade[row][col], int total[row])
{
   int r, c;
       for (r = 0; r < row; r++)
       {
           for (c = 0; c < col; c++)
               total[r] = total[r] + stgrade [r][c];
       }
}
//=========================Function for Average=================================
void staverage(int total[row], double average[row])
{
   int r, c;
   for (r=0;r    {  
       for (c = 0; c < col; c++)
           average[r] = static_cast(total[r]/col);

   }
}
//========================Function for Letter Grade==============================
void stlettergrade(double average[row], char ltrgrade[row])
{
   int r;
       for (r = 0; r < row; r++)
       {
           if (average[r] >= 90)
               ltrgrade[r] = 'A';
           else if (average[r] >= 80)
               ltrgrade[r] = 'B';
           else if (average[r] >= 70)
               ltrgrade[r] = 'C';
           else if (average[r] >= 60)
               ltrgrade[r] = 'D';
           else
               ltrgrade[r] = 'F';
       }
}
//=============================Function to Display Data=======================
void displayData(string stname[row], int stgrade[row][col], int total[row], double staverage [row], char ltrgrade[row])
{
   out.open("Results.txt");

   int r, c;
       for (r = 0; r < row; r++)
       {
           out << stname[r] << setw(3);
           for (c = 0; c < col; c++)
               out << setw(5) << stgrade[r][c];
           out << setw(5) << total[r]<< setw(5) << staverage[r]<< setw(5) << ltrgrade[r] << endl;
       }
}

Answer 1

#include <iostream>

#include <fstream>

#include <iomanip>

#include <string>

#include <cstdlib>

using namespace std;

const int row = 10;

const int col = 7;

ifstream name;

ifstream grade;

ofstream out;

void readData(string stname[row], int stgrade[row][col]);

void stsum(int stgrade[row][col], int total[row]);

void staverage(int total[row], double average[row]);

void stlettergrade(double average[row],char ltrgrade[row]);

void displayData(string stname[row], int stgrade[row][col], int total[row], double staverage[row], char ltrgrade[row]);

// sort functions

void sortByLetterGrade(string stname[row], int stgrade[row][col], int total[row], double staverage[row], char ltrgrade[row]);

void sortByName(string stname[row], int stgrade[row][col], int total[row], double staverage[row], char ltrgrade[row]);

int main() {

       int STG[row][col] = { {0},{0} };

       string STN[row] = {};

       int STT[row] = { 0 };

       double STA[row] = { 0.0 };

       char STLG[row] = {};

       readData(STN,STG); // Read Data

       stsum(STG, STT); // Find Total

       staverage(STT, STA); // Find average

       stlettergrade(STA, STLG); // Find letter grade

       displayData(STN, STG, STT,STA, STLG); // Call display function

       sortByLetterGrade(STN, STG, STT,STA, STLG); // Call sort letter grade function

       displayData(STN, STG, STT,STA, STLG); // Call display function

       sortByName(STN, STG, STT,STA, STLG); // Call sort students name function

       displayData(STN, STG, STT,STA, STLG); // Call display function for the last time.

       // close the files

       name.close();

       grade.close();

       out.close();

       system("pause");

       return 0;

}

//========================Function to Read Data===================================

void readData(string stname[row], int stgrade[row][col])

{

   name.open("Name.txt");

   grade.open("Grade.txt");

   int r, c;

   for (r = 0; r < row; r++)

   {

       getline(name, stname[r]);

       for (c = 0; c < col; c++)

       {

           grade >> stgrade[r][c];

       }

   }

}

//==================Function for Grade Total======================================

void stsum(int stgrade[row][col], int total[row])

{

   int r, c;

       for (r = 0; r < row; r++)

       {

           for (c = 0; c < col; c++)

               total[r] = total[r] + stgrade [r][c];

       }

}

//=========================Function for Average=================================

void staverage(int total[row], double average[row])

{

   int r, c;

   for (r=0;r<row;r++)    {

       for (c = 0; c < col; c++)

           average[r] = static_cast<double>(total[r]/col);

   }

}

//========================Function for Letter Grade==============================

void stlettergrade(double average[row], char ltrgrade[row])

{

   int r;

       for (r = 0; r < row; r++)

       {

           if (average[r] >= 90)

               ltrgrade[r] = 'A';

           else if (average[r] >= 80)

               ltrgrade[r] = 'B';

           else if (average[r] >= 70)

               ltrgrade[r] = 'C';

           else if (average[r] >= 60)

               ltrgrade[r] = 'D';

           else

               ltrgrade[r] = 'F';

       }

}

//=============================Function to Display Data=======================

void displayData(string stname[row], int stgrade[row][col], int total[row], double staverage [row], char ltrgrade[row])

{

   out.open("Results.txt");

   int r, c;

   for (r = 0; r < row; r++)

   {

          out << stname[r] << setw(3);

          for (c = 0; c < col; c++)

                out << setw(5) << stgrade[r][c];

          out << setw(5) << total[r]<< setw(5) << staverage[r]<< setw(5) << ltrgrade[r] << endl;

   }

}

//=============================Function to Sort the Data By Letter Grade (i.e grade with A will occur first and grade with F last) =======================

void sortByLetterGrade(string stname[row], int stgrade[row][col], int total[row], double staverage[row], char ltrgrade[row])

{

       int max;

       // loop over the records

       for(int i=0;i<row-1;i++)

       {

             max = i;

             for(int j=i+1;j<row;j++)

             {

                    // loop to get the ith student with highest A among the unsorted students

                    if(ltrgrade[j] < ltrgrade[max]) // since 'A' < 'B'

                           max = j;

             }

             // if ith student is not present in order, swap the values of student at index max with index i

             if(max != i)

             {

                    // swap the names

                    string tempStr = stname[i];

                    stname[i] = stname[max];

                    stname[max] = tempStr;

                    // swap the total

                    int tempInt = total[i];

                    total[i] = total[max];

                    total[max] = tempInt;

                    // swap the average

                    double tempDbl = staverage[i];

                    staverage[i] = staverage[max];

                    staverage[max] = tempDbl;

                    // swap the letter grade

                    char tempChr = ltrgrade[i];

                    ltrgrade[i] = ltrgrade[max];

                    ltrgrade[max] = tempChr;

                    // loop to swap the grades array contents

                    for(int c=0;c<col;c++)

                    {

                           tempInt = stgrade[i][c];

                           stgrade[i][c] = stgrade[max][c];

                           stgrade[max][c] = tempInt;

                    }

             }

       }

}

//=============================Function to Sort the Data By Name in ascending order=======================

void sortByName(string stname[row], int stgrade[row][col], int total[row], double staverage[row], char ltrgrade[row])

{

       int min;

       // loop over the records

       for(int i=0;i<row-1;i++)

       {

             min = i;

             // loop to get the ith student sorted by name

             for(int j=i+1;j<row;j++)

             {

                    if(stname[j] < stname[min])

                           min = j;

             }

             // if ith student is not present in order, then swap the ith student with min student

             if(min != i)

             {

                    // swap the names

                    string tempStr = stname[i];

                    stname[i] = stname[min];

                    stname[min] = tempStr;

                    // swap the total

                    int tempInt = total[i];

                    total[i] = total[min];

                    total[min] = tempInt;

                    // swap the average

                    double tempDbl = staverage[i];

                    staverage[i] = staverage[min];

                    staverage[min] = tempDbl;

                    // swap the letter grade

                    char tempChr = ltrgrade[i];

                    ltrgrade[i] = ltrgrade[min];

                    ltrgrade[min] = tempChr;

                    // swap the contents of grades arrray

                    for(int c=0;c<col;c++)

                    {

                           tempInt = stgrade[i][c];

                           stgrade[i][c] = stgrade[min][c];

                           stgrade[min][c] = tempInt;

                    }

             }

       }

}

//end of program