Homework Help: GPA Calculator

[dzimme2]

I am to write a program in which the user is prompted 4 times to enter a student's name, # of current hours, # of total hours, # of current quality points, # of total quality points, and course names. The program is to calculate the overall GPA of the student and write all information to output file "outfile.dat"

I am having trouble in writing the information to the output file. When I run the program, the output file heading is shown but not any of the student information. Suggestions??

#include <iostream.h>
#include <conio.h>
#include <fstream.h>
#include <iomanip.h>
#include <string.h>

int main()
{
	int i, j, coursenum, hours, total_hours, qp, total_qp;
	float gpa;
	char name[20], course[8], dummy;

	ofstream report("outfile.dat");		// setup the output data file	

	// send data to output file called outfile.dat

	report << "                  ET 212-XX Program Three, Fall 2011" << endl;
	report << "-----------------------------------------------------" << endl;
	report << endl;
	report << endl;
	report << "#   Student Name     Quality Points  Hours Earned  GPA  Courses Fall 2011" << endl;
	report << endl;
	report << "==========================================================================" << endl;

   
	// setup the for loop
	for (i=1; i <= 4; i++)
	{ 			// begin loop		
		cout << "Enter Student Name: ";		// prompt user for a student name
		cin.get(name,20);
		cin.get(dummy);	// read the extra new line into the dummy field
		cout << endl;	

		j = strlen(name);
		j = 20 - j;
		
		cout << "Enter number of hours: ";	// prompt user for current hours
		cin >> hours;
		cout << endl;
		
		cout << "Enter number of cummulitive hours: ";	// prompt user for cummulitive hours
		cin >> total_hours;
		cout << endl;
		
		cout << "Enter number of quality points this semester: ";// prompt user for current quality points
		cin >> qp;
		cout << endl;

		cout << "Enter number of total quality points: ";		// prompt user for total quality points
		cin >> total_qp;
		cout << endl;

		cout << "Enter # of courses enrolled for this semester: ";		// acquire # of courses for this semester per student
		cin >> coursenum;
		cout << endl;	
		
	total_hours = total_hours + hours;	// add semester hours to cummulitive hours
	total_qp = total_qp + qp;		  // add cummulitive quality points to quality points
	gpa = total_qp / total_hours;		 // caculate GPA
	
	report.setf(ios::fixed, ios::floatfield);		// use c++ commands to include decimal point in output
	report.setf(ios::showpoint);
	report.open("outfile.dat");	// output the data to the data file
	
	report << left << name[i] << total_qp[name] << total_hours[name] << gpa << course;
	
	for (j = 1; j <= coursenum; j++)		  // set up inner loop
	{ 									// begin inner loop
		cout << "Enter course name: ";
		cin >> course;
		cout << endl;
	} 									// end inner loop
	report << left << setw(50) << course[j] << endl;
	
	report << "-------------------------------------------------------------------------" << endl;
	cin.get(dummy);
 	}						// end outter loop

	report << endl;
	report.close(); 					// close data file
	return 0;
} 								// end program 

[MikeyBoy]

You don't write anything to outfile.dat inside your inner loop. Once you exit the inner loop, you attempt to write a single character, course[j], to the file. At this point, j is set to (coursenum + 1), so it's anyone's guess as to what character that is.

What are you trying to achieve with:

		j = strlen(name);
		j = 20 - j;

You don't use j again until you set it to 1 at the start of the inner loop, so those two lines of code don't have any effect.