getline command and grade function

[jonesin4anime]

First, I cannot figure out how to use getline to read data such as the following past the first name and last name. I can get the first name and last name to print of the first student, but after that it only prints the first name and zeros of the id and scores of the second student and does not even print the rest of the students

Jon Doe
2838596
93 85
Jane Smith
9493853
87 91
Kaitlyn Davies
4968493
80 78
Amanda Warden
5347646
67 98

Also I do not know how to print the letter grade of each score beside the number grade

We must have functions that read the data, determine the grade, compute the average of the class, and print the results

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
#include "prog5.h"

// function prototypes
void init_students(StudentGrade []); //init all stud data
void read_data(StudentGrade [], int&); // read data from file
void print_result(const StudentGrade [], int); //print report
float avg(const StudentGrade [], int); // finding the class average
char grade(const StudentGrade [], int);
int main()
{
StudentGrade studList[MAX_STDS];
int std_num; // number of student data read from file

init_students(studList);
read_data(studList, std_num);
avg(studList, std_num);
grade(studList, std_num);
print_result(studList, std_num);

return 0;
}

void init_students(StudentGrade st[])
{
// initialize each data member to zero or equivalent
int i;
for (i = 0; i < MAX_STDS; i++) {
st[i].name = "";
st[i].number = 0;
st[i].eng101 = 0;
st[i].hist201 = 0;
}
}
void read_data(StudentGrade st[], int& num)
{
ifstream inFile;
string fileName;

// ask the user for the name of the file
cout << "Enter the name of the file that contains the data: ";
cin >> fileName;

// open the file
inFile.open(fileName.data());
// error check
while (!inFile) // see if the file can be opened
{
cout << "File does not exist!" << endl;
cout << "Enter the name of the file: ";
cin >> fileName;
inFile.open(fileName.data());
} // end while

// reading begins
int i = 0;
getline(inFile, st[i].name);
while (inFile) {
inFile >> st[i].number >> st[i].eng101 >> st[i].hist201;
i++;
inFile >> st[i].name;
} // end while
num = i;
}

float avg(const StudentGrade st[], int num)
{
int sumEng = 0;
int sumHist = 0;
float avgEng = 0.0;
float avgHist = 0.0;
int i;

for (i = 0; i < num; i++)
{
sumEng = sumEng + st[i].eng101;
sumHist = sumHist + st[i].hist201;
}
cout << "Sum Eng" << sumEng <<endl;
cout << "Sum His" << sumHist <<endl;

num = i;
avgHist = sumHist/num;
avgEng = sumEng/num;
cout << "Avg hist is: " << avgHist << endl;
cout << "Avg eng is: " << avgEng <<endl;
}

char grade(const StudentGrade st[], int num)
{
int i;
char engScore;
char histScore;
for (i = 0; i < num; i++)
{
if(st[i].eng101 >= 90)
{
engScore = 'A';
}
else if(st[i].eng101 >= 80)
{
engScore = 'B';
}
else if(st[i].eng101 >= 70)
{
engScore = 'C';
}
else if(st[i].eng101 >= 60)
{
engScore = 'D';
}
else
{
engScore = 'F';
}
cout << engScore <<endl;
}
for (i = 0; i < num; i++)
{
if(st[i].hist201 > 90)
{
histScore = 'A';
}
else if(st[i].hist201 > 80)
{
histScore = 'B';
}
else if(st[i].hist201 > 70)
{
histScore = 'C';
}
else if(st[i].hist201 > 60)
{
histScore = 'D';
}
else
{
histScore = 'F';
}
cout << histScore <<endl;
}
}
void print_result(const StudentGrade st[], int num)
{
int sumEng = 0;
int sumHist = 0;
float avgEng = 0.0;
float avgHist = 0.0;
int i;
//print header
cout << "Student Name " << "Student ID " << "Eng101 "
<< "Hist201" <<endl;
cout << "------------" << " ----------" << " ------"
<< " -------" <<endl;

for (i = 0; i < num; i++) {
cout << st[i].name << " " << st[i].number
<< " " << st[i].eng101 << " "
<< st[i].hist201 <<endl;

sumEng = sumEng + st[i].eng101; // sum for English scores
sumHist = sumHist + st[i].hist201; // sum for History scores

}

}

[Albatross]

We had a question like this before...

st is a struct, correct? Could we get it's contents?
As for printing the letter grade, what problems are you having with that, exactly? EDIT: Aren't you storing the letter in a char from which you could access and print it just like that?

-Albatross

P.S.- Am I the only one who finds st[i] a little bit funny?

[jonesin4anime]

I'm sorry about that

const int MAX_STDS = 20;

struct StudentGrade {
   int number;          // student number
   string name;         // student name
   float eng101;
   float hist201;
};

I know it's a stupid question, but I can't quite think right now so how would I be able to access and print each individual letter grade

the output should look similar to this

Student Name	Student ID		Eng101	Hist201
     Jon Doe	 xxxxxxxxx		 93(A)	  85(B)
  Jane Smith	 yyyyyyyyy		 87(B)	  91(A)
         ...
			Class Average:     ...		  ...

[jonesin4anime]

Can someone please help me? This is due very soon and I am stuck and frustrated

[Albatross]

For your struct, insert a variable named char letter; (for example, but it has to be a char). Assuming you know how to compute the letter grade, after computing it you can put it into your char that you have in your struct, and then just read it out along with all the other data.
If you are forbidden from modifying your struct, then create a char[] outside of any functions (some will say this is evil, but...)

Speaking of which, you should declare your avg variables outside of all the functions as well.

@Anyone who thinks global variables are evil: Ridiculously long lists of arguments are evil too, no? Which makes the code harder to follow: a few variables declared on the outside of all the functions, or a function or two that requires so many arguments that it's hard to keep track of what goes where?

I hope that helps.

-Albatross