Need help in c++, I have the code i need the output to display the avergae but i

Question

Need help in c++, I have the code i need the output to display the avergae but it is not displaying please help and thank you

Program 1: (Practicing an example of function using call by reference)

Write a program that reads a set of information related to students in C++ class and prints them in a table format. The information is stored in a file called data.txt. Each row of the file contains student number, grade for assignment 1, grade for assignment 2, grade for assignment 3, and grade for assignment 4. Your main program should read each row, pass the grades for the three assignments to a function called ProcessRow to calculate the average of the grades, minimum of the four assignments, and the maximum of the four assignments. The results (average, maximum, and minimum) should be returned to the main program and the main program prints them on the screen in a table format. For example, if the file includes

126534   7   8   10   7

321345   5   6   4   9

324341   8   3   8   5

your program should print  

Std-Id       A1   A2   A3   A4   Min Max Average

----------------------------------------------------------------------------------

126534 7   8 10 7 7 10 8

321345 5   6 4 9 4 9 6  

324341 8   3 8 5 3   8 6  

You must use call by reference to do the above question.

My code below

#include <iostream>

#include <fstream>

#include <iomanip>

#include <string>

using namespace std;

//function prototype

void ProcessARow(int a1, int a2, int a3, int a4, int &min, int &max, float &average);

int main()

{

int id;

int a1;

int a2;

int a3;

int a4;

int min;

int max;

float average;

  

string filename = "data.txt";

ifstream infile;

infile.open (filename);

  

//if file is not found it will print out not found

if(!infile)

{

cout << filename << " is not found! " << endl;

system("pause");

exit(1);

}

//printing output heading

cout << left << setw(12) << "std-id" << setw(6) << "A1" << setw(6) << "A2" << setw(6) << "A3" << setw(6) << "A4" << setw(6) << "Min" << setw(6) << "Max" << setw(6) << "Average" << endl;

cout << "-------------------------------------------------------" << endl;

//reading student id

infile >> id;

while(infile)

{

//reading four grades

infile >> a1 >> a2 >> a3 >> a4;

  

//calling the processARow function

ProcessARow(a1, a2, a3, a4, min, max, average);

  

//displaying the details

printf("%-12d%-6d%-6d%-6d%-6d%-6d%-6.1f ", id, a1, a2, a3, a4, min, max, average);

  

//reading student id

infile >> id;

}

system("pause");

return 0;

}

//processARow function

void ProcessARow(int a1, int a2, int a3, int a4, int &min, int &max, float &average)

{

//finding min vaule

if(a1 < a2 && a1 < a3 && a1 < a4)

min = a1;

else if(a2 < a3)

min = a2;

else if(a3 < a4)

min = a3;

else

min = a4;

  

//finding max

if(a1 > a2 && a1 > a3 && a1 > a4)

max = a1;

else if(a2 > a3)

max = a2;

else if(a3 > a4)

max = a3;

else

max = a4;

  

//getting average

average = (a1 + a2 + a3 + a4) / 4.0;

}

Explanation / Answer

UPDATED PROGRAM USING C++

/* data.txt File

126534 7 8 10 7

321345 5 6 4 9

324341 8 3 8 5 */

#include <iostream>

#include <fstream>

#include <iomanip>

#include <string>

using namespace std;

//function prototype

void ProcessARow(int a1, int a2, int a3, int a4, int &min, int &max, float &average);

int main()

{

int id;

int a1;

int a2;

int a3;

int a4;

int min;

int max;

float average;

  

char filename[20] = "f:\dataStd.txt";

ifstream infile;

infile.open (filename);

  

//if file is not found it will print out not found

if(!infile)

{

cout << filename << " is not found! " << endl;

system("pause");

exit(1);

}

//printing output heading

cout << left << setw(12) << "std-id" << setw(6) << "A1" << setw(6) << "A2" << setw(6) << "A3" << setw(6) << "A4" << setw(6) << "Min" << setw(6) << "Max" << setw(6) << "Average" << endl;

cout << "-------------------------------------------------------" << endl;

//reading student id

infile >> id;

while(infile)

{

//reading four grades

infile >> a1 >> a2 >> a3 >> a4;

  

//calling the processARow function

ProcessARow(a1, a2, a3, a4, min, max, average);

  

//displaying the details
// I am modified this printf() statement using cout with input output manipulation<iomanip.h> setw()

cout << left << setw(12) <<id<< setw(6) <<a1<< setw(6) <<a2<< setw(6) <<a3<< setw(6) <<a4<< setw(6) <<min<< setw(6) <<max<< setw(6) <<average<< endl;

  

//reading student id

infile >> id;

}

system("pause");

return 0;

}

//processARow function

void ProcessARow(int a1, int a2, int a3, int a4, int &min, int &max, float &average)

{

//finding min vaule

if(a1 < a2 && a1 < a3 && a1 < a4)

min = a1;

else if(a2 < a3 && a2 < a4) // add additional condition a2 < a4

min = a2;

else if(a3 < a4)

min = a3;

else

min = a4;

  

//finding max

if(a1 > a2 && a1 > a3 && a1 > a4)

max = a1;

else if(a2 > a3 && a2 > a4) // add addition condition a2 > a4

max = a2;

else if(a3 > a4)

max = a3;

else

max = a4;

  

//getting average

average = (a1 + a2 + a3 + a4) / 4.0;
}

OUTPUT:

std-id A1 A2 A3 A4 Min Max Average
-------------------------------------------------------
126534 7 8 10 7 7 10 8
321345 5 6 4 9 4 9 6
324341 8 3 8 5 3 8 6

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