Hi, I really need help with my c++ assignments. Thank's to everyone who can help!
Create a grading program that reads a file exam grades and computes the Average grade and the letter grade for each of 5 students. Each student has 4 exam grades. Letter grade: A => 90 > B => 80 > C => 70 > D => 60 > F
Output: StudentNumber , Exams, Average, Grade
Example Output::
The record for student number: 1
The exam grades are: 70 80 90 95
The numeric average is: 83.75
and the letter grade assigned is B
Use the class definition given. Code the class.
class StudentRecord
{
public:
void input( ifstream& input,int studentid);
// reads exam scores for this student
void computeGrade();
//calculates the numeric average and letter grade.
void output();
//outputs the student record.
private:
int studentNumber;
double exam1;
double exam2;
double exam3;
double exam4;
double average;
char grade;
};
Use the following test data to test your program:
File name ( contains 4 grades for each of 5 students
ExamGrades.txt 70 80 90 95 95 85 90 80 75 85 70 80 55 85 50 70 45 50 40 35
#include <iostream>
#include <fstream> // I/O
#include <iomanip> // For setw()
using namespace std;
ofstream outputfile("output.txt"); // Output file
const int MAX_FILE_NAME = 35; // Max space allocated for file name
const int CLASS_SIZE = 5;
class StudentRecord
{
public:
void input( ifstream& input,int studentid);
// reads exam scores for this student
void computeGrade();
//calculates the numeric average and letter grade.
void output();
//outputs the student record.
private:
int studentNumber;
double exam1;
double exam2;
double exam3;
double exam4;
double average;
char grade;
};
// Utility Functions
void open_input(ifstream& input, char name[]); // Get file name & Open file
void process_file(ifstream& input); // Read each value & process it
int main()
// Parameters: None
// Returns: Zero
// Calls: open_input(), process_file()
{ char again; // Does user want to go through loop again?
char file_name[MAX_FILE_NAME + 1]; // Name of file to be processed
ifstream input_numbers; // For working with input file
cout << "This program can calculate the values needed for\n"
<< "customer invoices.\n" << endl;
system("pause"); // Hold message on screen until key is pressed
do
{
system("cls"); // Clear screen
open_input(input_numbers, file_name); // Get file name & open file
process_file(input_numbers); // Process values in file
input_numbers.close(); // Close file
cout << "\nDo you want to process another file (Y/N)? ";
cin >> again;
cin.ignore(256, '\n'); // Remove Enter key from keyboard buffer
} while ( again == 'y' || again == 'Y');
cout << "\nEnd of Program!" << endl;
outputfile << "\n\nThanks for using Invoice!\f";
outputfile.close();
return 0;
} // End of main()
void open_input(ifstream& input, char name[]) //Open file, exit on error
// Parameters: Variables for input file reference nad input file name
// Returns: None
// Calls: None
{ int count = 0; // Count number of tries
do // Continue until we get a valid file name and can open file
{ count++;
if (count != 1) // Issue error message if we are trying again.
{ cout << "\n\aInvalid file name or file does not exist. Please try again."
<< endl;
}
cout << "\nEnter the input file name (maximum of " << MAX_FILE_NAME
<< " characters please)\n:> ";
cin.get(name, MAX_FILE_NAME + 1);// Gets at most MAX_FILE_NAME characters
cin.ignore(256, '\n'); // Remove Enter key from keyboard buffer
input.clear(); // Clear all error flags, if any, from prev try
input.open(name,ios_base::in); // Open only if file exists
} while (input.fail() ); // If can't open file, try again
} // End of open_input()
void process_file(ifstream& input)
// Parameters: Variable for file reference
// Returns: None
// Calls: Invoice::set_merchandise_value(), Invoice::output()
{
int thisStudent = 0;
StudentRecord student = StudentRecord();
while (thisStudent++ < CLASS_SIZE)
{
student.input (input, thisStudent);
student.computeGrade();
student.output();
}
} // End of process_file()
void StudentRecord::computeGrade()
{
int studentnubmer;
double average = average;
average = (exam1+exam2+exam3+exam4)/4;
}
double average;
{
double value;
double sum = 0;
int count = 0;
while (input >> value)
{
sum += value;
count ++;
}
return sum/count;
}
char grade;
{
char grade;
if(average>=90)
grade = 'A';
else if(average<90 && average>=80)
grade = 'B';
else if(average<80 && average>=70)
grade = 'C';
else if(average<70 && average>=60)
grade = 'D';
else if(average<60)
grade = 'F';
}
void StudentRecord::output()
{
cout<<"The exam grades are: "<<exam1<<"\t"<<exam2<<"\t"<<exam3<<"\t"<<exam4<<"\t"<<endl;
cout<<"The numeric average is: "<<average<<endl;
cout<<" and the letter grade assigned is: "<<grade<<endl;
}1>c:\users\Jimmy\documents\visual studio 2010\projects\assignment 8\assignment 8\assign 8.cpp(119): warning C4101: 'studentnubmer' : unreferenced local variable
1>c:\users\Jimmy\documents\visual studio 2010\projects\assignment 8\assignment 8\assign 8.cpp(128): error C2447: '{' : missing function header (old-style formal list?)
1>c:\users\Jimmy\documents\visual studio 2010\projects\assignment 8\assignment 8\assign 8.cpp(146): error C2447: '{' : missing function header (old-style formal list?)
1>
