Solved

Help with C++ program for class (URGENT!)

Posted on 2010-08-15
7
378 Views
Last Modified: 2013-12-14
Hi I'm having a problem with my code not computing correct values.  There is a weighted score that computes a .7 * exam + .3 * lab.  It is not functioning properly someone please tell me why the results are off.
0
Comment
Question by:etan08
  • 3
  • 2
  • 2
7 Comments
 

Author Comment

by:etan08
ID: 33442693
Here's the code for the program.
#include <iostream>
#include <iomanip>

using namespace std;
#define max 100

int getExamScores(int, double*);
int getLabScores(int, double*);
int getTotalStudentCount();

void calculatePointGrades(double[], int, double[]);
void calculateLetterGrades(int, double[]);
void showGradeData(int);

double examGrade[max];
double labGrade[max];
double pointGrade[max];

char letterGrade[max];

void main()
{
	int numStudents;
	numStudents = getTotalStudentCount();
	getExamScores(numStudents, examGrade);
	getLabScores(numStudents, labGrade);
	calculatePointGrades(examGrade, numStudents, labGrade);
	calculateLetterGrades(numStudents, pointGrade);
	showGradeData(numStudents);
	cin.ignore(2);
}

//asks the user to enter the number of students and returns the value entered.
int getTotalStudentCount()
{
	int totalStudentCount;
	cout << "Please enter the number of students: ";
	cin>>totalStudentCount;

	cout << endl;

	return totalStudentCount;
}

//receives the number of students and the name of one-dimensional integer array to store the scores entered 
//by the user.  It should include the student number in the prompt to enter each exam score.
int getExamScores (int totalStudentCount , double *Grade)
{
	cout << endl;

	for (int student = 0; student < totalStudentCount; ++student)
	{
		cout << "Enter the exam grade for student " <<  student + 1 << ": ";
		cin >> *Grade;
		Grade++;
	}

	cout << endl;
	return 0;
}

//receives the number of students and the name of one-dimensional array to store the floating point 
//lab average scores entered by the user.  It should include the student number in the prompt to enter each score.
int getLabScores (int totalStudentCount , double *Grade)   
{
	cout << endl;
	for (int student = 0; student < totalStudentCount; ++student)
	{
		cout << "enter the lab grade for student " <<  student + 1 << ": ";
		cin >> *Grade;
		Grade++;
	}
	cout << endl;


	return 0;
}

//receives the two arrays of scores (for the exam and lab average), the number of students and the 
//name of a one-dimensional array into which the calculated point grades are to be stored.
void calculatePointGrades(double labGrade[],int totalStudentCount, double examGrade[])  
{
	for (int student = 0; student < totalStudentCount; student++)
	{
		pointGrade[student] = (.7 * examGrade[student]) + (.3 * labGrade[student]);
	}
}

//receives the point grades array, the number of students, and the name of a one-dimensional array(pointGrade) of 
//characters to store the letter grades (as determined by each student’s point grade)
void calculateLetterGrades(int totalStudentCount, double pointGrade[])  
{
	for (int student = 0; student < totalStudentCount; ++student)
	{
		if(pointGrade[student]>=90)
			letterGrade[student]='A';
		else if(pointGrade[student] >= 80 && pointGrade[student] < 90)
			letterGrade[student]='B';
		else if(pointGrade[student] >= 70 && pointGrade[student] < 80)
			letterGrade[student]='C';
		else if(pointGrade[student] >= 60 && pointGrade[student] < 70)
			letterGrade[student]='D';
		else
			letterGrade[student]='F';
	}
}

//to display the table as shown in Figure 1 and the overall averages for exam, lab scores and point scores
void showGradeData(int totalStudentCount) 
{
	double examGradeTotal = 0, labGradeTotal = 0.0, pointTotal = 0.0;  
	double examGradeAvg, labGradeAvg, pointScoreAvg;  

	cout << "-----------------------------------------------------------------" << endl;
	cout << "|" << setw(3) << "SN" << setw(15) << "Exam" << setw(15) << "Lab" << setw(15) << "Point" << setw(15) << "Letter" << "|" << endl;
	cout << "|" << setw(3) << "" << setw(15) << "" << setw(16) << "Ave." << setw(14) << "Grade" << setw(14) << "Grade"<< setw(2) << "|" << endl;
	cout << "-----------------------------------------------------------------" << endl;
	for(int student = 0; student < totalStudentCount; student++)
	{
		cout << "|" << setw(3) << student + 1 << setw(15) << examGrade[student] << setw(15) << labGrade[student] << setw(15) << pointGrade[student] << setw(10) << letterGrade[student] << setw(6) << "|" << endl;

		examGradeTotal = examGradeTotal + examGrade[student];
		labGradeTotal = labGradeTotal + labGrade[student];
		pointTotal = pointTotal + pointGrade[student];
	}
	cout << "-----------------------------------------------------------------" << endl;

	examGradeAvg = (double)examGradeTotal / totalStudentCount;
	labGradeAvg = labGradeTotal / totalStudentCount;
	pointScoreAvg = pointTotal / totalStudentCount;

	cout << "\n\n Exam Average        : " << examGradeAvg;
	cout << "\n Lab Average Average : " << labGradeAvg;
	cout << "\n Point Score Average : " << pointScoreAvg;
}

Open in new window

0
 

Author Comment

by:etan08
ID: 33442732
ExpectedResults:
      
SN   Exam Lab   Points      Grade
1      100      100      100              A
2      95      99.9      96.47      A
3      90      99.9      92.97      A
4      80      88.8      82.64      B
5      70      77.7      72.31      C
6      60      66.6      61.98      D
7      50      55.5      51.65        F

      Exam Average:        77.8571
      Lab Grade Average:   84.0571
      Point Grade Average: 79.7171
      
      
      
      
ActualResults:
      
SN   Exam Lab   Points      Grade
1      100      100   100              A
2      95      99.9      98.43      A
3      90      99.9      96.93      A
4      80      88.8      86.16      B
5      70      77.7      75.39      C
6      60      66.6      64.62      D
7      50      55.5      53.85       F
      
      Exam Average:        77.8571
      Lab Grade Average:   84.0571
      Point Grade Average: 82.1971
      
0
 
LVL 32

Accepted Solution

by:
phoffric earned 500 total points
ID: 33442845
>> void calculatePointGrades(double labGrade[],int totalStudentCount, double examGrade[])  
>> calculatePointGrades(examGrade, numStudents, labGrade);

Do you see a problem here?
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 12

Expert Comment

by:w00te
ID: 33442865
You switched the parameters in your call for exam and lab grades.
0
 
LVL 12

Expert Comment

by:w00te
ID: 33442868
Aw damn you and your faster typing Phoffric :p.
0
 
LVL 32

Expert Comment

by:phoffric
ID: 33442870
Isn't that evident from my post?
0
 

Author Comment

by:etan08
ID: 33442872
yup! Thanks
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
The line on IDE 4 96
find Speed using GPS latitude & longitude 4 78
How do I get Window Title of all opened process? 4 32
boost::uuid crashes 17 35
Here is a helpful source code for C++ Builder programmers that allows you to manage and manipulate HTML content from C++ code, while also handling HTML events like onclick, onmouseover, ... Some objects defined and used in this source include: …
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

679 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question