#include <fstream> #include <iostream> #include <iomanip> using namespace std; /

Question

#include <fstream>

#include <iostream>

#include <iomanip>

using namespace std;

// Declaring global arrays and variables

string lastnames[40];

int scores[40][5];

double avgArr[40];

char grades[40];

int noOfStuds;

// Function Declarations

void readData(ifstream& dataIn);

char calGrade(double average);

void displayData(ofstream& dataOut);

int main()

{

ifstream dataIn;

ofstream dataOut;

readData(dataIn);

displayData(dataOut);

return 0;

}

void readData(ifstream& dataIn)

{

string name;

int score, i = 0;

char grade;

double avg = 0.0, total;

cout << setprecision(1) << fixed << showpoint;

dataIn.open("scores.txt");

if (dataIn.fail())

{

cout << "I can't find the file";

exit(1);

}

else

{

while (!dataIn.eof())

{

total = 0.0;

dataIn >> name;

lastnames[i] = name;

for (int j = 0; j < 5; j++)

{

dataIn >> score;

scores[i][j] = score;

total += score;

}

avg = total / 5;

avgArr[i] = avg;

grade = calGrade(avg);

grades[i] = grade;

i++;

noOfStuds++;

}

dataIn.close();

}

}

/* function implementation which will

* calcualte the grade based on the average

*/

char calGrade(double average)

{

char grade;

if (average >= 90 && average <= 100)

grade = 'A';

else if (average >= 80 && average <= 89)

grade = 'B';

else if (average >= 70 && average <= 79)

grade = 'C';

else if (average >= 60 && average <= 69)

grade = 'D';

else if (average >= 0 && average <= 59)

grade = 'F';

return grade;

}

void displayData(ofstream& dataOut)

{

dataOut.open("grades.txt");

cout << "Last Name Score1 Score2 Score3 Score4 Score5 Avg Grade" << endl;

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

dataOut << "Last Name Score1 Score2 Score3 Score4 Score5 Avg Grade" << endl;

dataOut << "--------- ------ ------ ------ ------ ------ --- -----" << endl;

for (int i = 0; i < noOfStuds; i++)

{

cout << setw(10) << lastnames[i] << " ";

dataOut<< setw(10) << lastnames[i] << " ";

for (int j = 0; j < 5; j++)

{

cout << scores[i][j] << " ";

dataOut << scores[i][j] << " ";

}

cout << avgArr[i] << " " << grades[i] << endl;

dataOut << avgArr[i] << " " << grades[i] << endl;

}

dataOut.close();

}

What is problem of this?

Explanation / Answer

The problem with the program.

for (int j = 0; j < 5; j++)

{

dataIn >> score;

scores[i][j] = score;

total += score;

}

from this piece of code it is not clear as which score to read from file.

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