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Assignment
Introduction:
In this course we are going to develop software for “School System” that will computerize all the necessary school processes. This software will facilitate the school management in running and managing the school. We will mainly focus on these aspects,
1. Teacher and Student Record Keeping
2. Student Grading
3. School Library Management
The explanations of these three parts are given below,
1. Teacher and Student Record Keeping
Our software will store record of students and teachers in the school.
a. We will store necessary attributes for students such as,
(name, age, parents name, address, class, roll no …..)
Student class may have extra attributes like borrowed book name or id and student grades as well.
b. We will store necessary attributes for teachers such as,
(name, age, NIC No, address, education, experience, teaching subjects…..)
2. Student Grading
We will store grades of each student for all subjects.
3. School Library Management System
This part will keep track of all books present in the library as well as it will keep record of borrowing and returning of books by students.
Task Description:
This Assignment is starting phase of this system in this assignment you will focus on the tasks given below:
1. You have to identify the main entities (objects) for this system.
2. You will have to find out the necessary attributes and functions that need to be associated with each object to implement the functionality mentioned above. (There will be setter and getter functions corresponding to each attribute and other necessary functions for example there may be a function borrow book in student class that may store name or id of the borrowed book by the student similarly it can have functions to store and show grades of the student).
3. You have to find out the relationships between these objects, for example teacher and student common attributes can be combined in a single base class.
4. You will make a final comprehensive object model showing all objects and their relations along with their attributes and functions.
You have to perform all these four steps give above in your solution file.
Note:
a. Use all concepts you have studied so far like abstraction, encapsulation, inheritance, generalization, specialization, sub-typing and association to students.
b. You need not to worry about data types of attributes at this moment these will be considered in next assignments.
Drawing Final Object Model:
a. You can use any tool for drawing like MS Office or Visio.
b. Or you can use open source tool Argo UML (in that case you have to install java run time environment as well links to download and install both are given on the page)
http://argouml.tigris.org/
You can install Java Runtime Environment directly from,
http://www.java.com/en/download/inc/windows_upgrade_ie.jsp
Important things to consider:
1. As happens in real world that everyone visualize a problem in different way so the solutions of all students should be according to their own thinking not taken from some source.
2. As this is preliminary phase of our system so it is recommended that you identify as much objects and their relationships as you can (some of them may be eliminated in coming assignments).
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i think you should read the guidelines before asking a query.
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Preparatory assignment:
- Read How to get an answer to your question.
- Try to understand what have you read.
- Read again.
- If you have any doubt then go to point 1.
- Try to make a meaningful post in the forum.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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How to Previewing video and write to file from video capture device using Direct show ...
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Look at the AMCap direct show sample.
«_Superman_»
I love work. It gives me something to do between weekends.
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We know cvcamshift.cpp in cv.lib of opencv .Do you understand the program's algorithmic about it's Orientation and Scale Calculation.I don't konw how it work.
I show the file cvcamshift.cpp
<br />
<br />
CV_IMPL int<br />
cvCamShift( const void* imgProb, CvRect windowIn,<br />
CvTermCriteria criteria,<br />
CvConnectedComp* _comp,<br />
CvBox2D* box )<br />
{<br />
const int TOLERANCE = 10;<br />
CvMoments moments;<br />
double m00 = 0, m10, m01, mu20, mu11, mu02, inv_m00;<br />
double a, b, c, xc, yc;<br />
double rotate_a, rotate_c;<br />
double theta = 0, square;<br />
double cs, sn;<br />
double length = 0, width = 0;<br />
int itersUsed = 0;<br />
CvConnectedComp comp;<br />
CvMat cur_win, stub, *mat = (CvMat*)imgProb;<br />
<br />
CV_FUNCNAME( "cvCamShift" );<br />
<br />
comp.rect = windowIn;<br />
<br />
__BEGIN__;<br />
<br />
CV_CALL( mat = cvGetMat( mat, &stub ));<br />
<br />
CV_CALL( itersUsed = cvMeanShift( mat, windowIn, criteria, &comp ));<br />
windowIn = comp.rect;<br />
<br />
windowIn.x -= TOLERANCE;<br />
if( windowIn.x < 0 )<br />
windowIn.x = 0;<br />
<br />
windowIn.y -= TOLERANCE;<br />
if( windowIn.y < 0 )<br />
windowIn.y = 0;<br />
<br />
windowIn.width += 2 * TOLERANCE;<br />
if( windowIn.x + windowIn.width > mat->width )<br />
windowIn.width = mat->width - windowIn.x;<br />
<br />
windowIn.height += 2 * TOLERANCE;<br />
if( windowIn.y + windowIn.height > mat->height )<br />
windowIn.height = mat->height - windowIn.y;<br />
<br />
CV_CALL( cvGetSubRect( mat, &cur_win, windowIn ));<br />
<br />
<br />
<big>CV_CALL( cvMoments( &cur_win, &moments ));
<br />
m00 = moments.m00;<br />
m10 = moments.m10;<br />
m01 = moments.m01;<br />
mu11 = moments.mu11;<br />
mu20 = moments.mu20;<br />
mu02 = moments.mu02;<br />
<br />
if( fabs(m00) < DBL_EPSILON )<br />
EXIT;<br />
<br />
inv_m00 = 1. / m00;<br />
xc = cvRound( m10 * inv_m00 + windowIn.x );<br />
yc = cvRound( m01 * inv_m00 + windowIn.y );<br />
a = mu20 * inv_m00;
b = mu11 * inv_m00;
c = mu02 * inv_m00;
<br />
<br />
square = sqrt( 4 * b * b + (a - c) * (a - c) );<br />
<br />
<br />
theta = atan2( 2 * b, a - c + square );<br />
<br />
<br />
<br />
<br />
cs = cos( theta );<br />
sn = sin( theta );<br />
<br />
rotate_a = cs * cs * mu20 + 2 * cs * sn * mu11 + sn * sn * mu02;<br />
rotate_c = sn * sn * mu20 - 2 * cs * sn * mu11 + cs * cs * mu02;<br />
length = sqrt( rotate_a * inv_m00 ) * 4;<br />
width = sqrt( rotate_c * inv_m00 ) * 4;<br />
<br />
<br />
if( length < width )<br />
{<br />
double t;<br />
<br />
CV_SWAP( length, width, t );<br />
CV_SWAP( cs, sn, t );<br />
theta = CV_PI*0.5 - theta;<br />
}<br />
<br />
<br />
if( _comp || box )<br />
{<br />
int t0, t1;<br />
int _xc = cvRound( xc );<br />
int _yc = cvRound( yc );<br />
<br />
t0 = cvRound( fabs( length * cs ));<br />
t1 = cvRound( fabs( width * sn ));<br />
<br />
t0 = MAX( t0, t1 ) + 2;<br />
comp.rect.width = MIN( t0, (mat->width - _xc) * 2 );<br />
<br />
t0 = cvRound( fabs( length * sn ));<br />
t1 = cvRound( fabs( width * cs ));<br />
<br />
t0 = MAX( t0, t1 ) + 2;<br />
comp.rect.height = MIN( t0, (mat->height - _yc) * 2 );<br />
<br />
comp.rect.x = MAX( 0, _xc - comp.rect.width / 2 );<br />
comp.rect.y = MAX( 0, _yc - comp.rect.height / 2 );<br />
<br />
comp.rect.width = MIN( mat->width - comp.rect.x, comp.rect.width );<br />
comp.rect.height = MIN( mat->height - comp.rect.y, comp.rect.height );<br />
comp.area = (float) m00;<br />
}</big><br />
<br />
__END__;<br />
<br />
if( _comp )<br />
*_comp = comp;<br />
<br />
if( box )<br />
{<br />
box->size.height = (float)length;<br />
box->size.width = (float)width;<br />
box->angle = (float)(theta*180./CV_PI);<br />
box->center = cvPoint2D32f( comp.rect.x + comp.rect.width*0.5f,<br />
comp.rect.y + comp.rect.height*0.5f);<br />
}<br />
<br />
return itersUsed;<br />
}<br />
<br />
<br />
Thank you everybody.I am looking forward to you answer .
hello
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Hi,
I am reading a file using C into a buffer (structure). For 7 times I am reading it without error but when I try to read that 8th or 9th time it is reaidng the content into buffer but fread() is returning zero can anybody suggest me what mey be the reason.
Thanks in advance,
Regards,
Hema.
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You probably reached the end of the file.
You are probably seeing the previous contents in the buffer when fread returns 0.
«_Superman_»
I love work. It gives me something to do between weekends.
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Will a parent class constructor be called by child class constructor by default ?
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The order of execution of the constructor is from parent to child class..ie first parent class constructor is invoked then child class constructor will be invoked..
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For default constructors, Yes.
For other argument constructors you have to explicitly call it.
«_Superman_»
I love work. It gives me something to do between weekends.
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Can a child class pointer access the base class members ?
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It can access public members of the base class.
«_Superman_»
I love work. It gives me something to do between weekends.
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so this would be by typecasting the pointer as the base class object pointer or direct access ?
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No need of typecasting.
«_Superman_»
I love work. It gives me something to do between weekends.
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I'm not sure I fully understood the question but if he's talking about a child class accessing the members of the base class (I didn't get the part with the pointer...), then it can also access protected members.
Of course, this is in the case of public inheritance (is there actually anybody using another kind of inheritance  ?)
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This is what I think his question is -
class Base
{
protected:
int i;
};
class Child : public Base
{
};
void main()
{
Child* ptr = new Child;
ptr->i;
}
«_Superman_»
I love work. It gives me something to do between weekends.
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Will stop posting this question over and over again ? If you didn't get any reply yet it can mean that nobody knows the answer or your question is so vague that nobody can reply.
Yesterday somebody asked for clarifications and you didn't reply. Somebody else even gave you a solution. So what's the problem with it ? You don't care because it's not a full code snippet that works out of the box ?
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Purish Dwivedi wrote: Some more clarification is needed...
So why didn't you ask him instead of reposting your question as if nobody replied ?
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