Lab #2 Solution

Note:

You can write, debug and test your code locally on your personal computer. However, the code you submit must compile and run correctly on the PACE-ICE server.


Grading Rubric

If a student’s program runs correctly and produces the desired output, the student has the potential to get a 100 on his or her homework; however, TA’s will randomly look through this set of “perfect-output” programs to look for other elements of meeting the lab requirements. The table below shows typical deductions that could occur.



AUTOMATIC GRADING POINT DEDUCTIONS PER PROBLEM:


Element
Percentage
Details


Deduction



13 member functions
6%
Per function. (Total 78 %)






Does Not Compile
Up to 30%
Code does not compile on PACE-ICE!






Clear Self-Documenting
Up to 22%
This can include incorrect indentation, using unclear variable

Coding Styles

names, unclear/missing comments, or compiling with warnings.



(See Appendix A)





LATE POLICY




Element
Percentage

Details


Deduction








Late Deduction Function
score -

H = number of hours (ceiling function) passed deadline


(20/24)*H

note : Sat/Sun count as one day; therefore H = 0.5*Hweekend








Problem 1: MyGrid Class

Complete a class called MyGrid that has a member variable gridElements that is a dynamic two-dimensional array of elements (type long) of m rows by n columns. The class also contains two long variables called myX and myY which indicates the upper left-hand location of element (0,0) of the grid. Your class needs to be contained in two files. MyGrid.h is provided and has the class declaration. MyGrid.cpp is where all your member functions need to be implemented. The main.cpp file is provided for you to test your class’s functionality.

The program needs to be able to read in text files containing initialization information for a MyGrid object. The names of the input files are passed into your program as command line arguments. All values in the input file are space separated and the file format will be as follows:

    • First line has the myX and myY values

    • Second line has the m number of rows and n number of columns

    • The next m lines will contain n column elements.

There are sample input files (input1.txt and input2.txt) included that can be used for reference.

Your program needs to be able to read in the input files and correctly create the individual MyGrid objects.

Your program needs to support all the functionality used in the provided main.cpp file.

Your class needs to support the following operators:

MyGrid operator+( MyGrid const &) const;
MyGrid operator-( MyGrid const &) const;

these operators use the extents of the grid and the upper left-hand corner to create a new grid that has the maximum extents of the two grids (see the image below). The values of the elements for the new grid are obtained by combining the values from the two grids on an element by element basis. Any new elements are initialized to zero.

MyGrid operator+(long const &) const;

Adds a long to all the elements in the MyGrid object.

friend MyGrid operator+(long const& lhs, MyGrid const &rhs);

Adds a MyGrid object to a long. The long value is added to all the elements in the MyGrid object.

MyGrid& operator++() and MyGrid operator++(int) all the element values are increased by one MyGrid& operator—() and MyGrid operator--(int) all the element values are decreased by one

MyGrid operator-() const;

has the same effect as multiplying all the elements by -1

bool operator==( MyGrid const &) const;

the size and all the elements must be the same, and the upper left-hand offset must be the same.

friend fstream & operator<<( fstream& os, const MyGrid & foo);

this operator outputs the class using the same format as is used in reading in a MyGrid object.


Your class also needs to have the following public member functions:

bool loadGridFromFile(const std::string &filename); void zeroOutGrid(); sets all elements to 0 long getNumRows() const; long getNumCols() const;
































Canvas Submission:

Upload your versions of MyGrid.h and MyGrid.cpp to canvas.











Appendix A: Coding Standards

Indentation:

When using if/for/while statements, make sure you indent 4 spaces for the content inside those. Also make sure that you use spaces to make the code more readable.

For example:

for (int i; i < 10; i++)

{

j = j + i;

}

If you have nested statements, you should use multiple indentions. Each { should be on its own line (like the for loop) If you have else or else if statements after your if statement, they should be on their own line.

for (int i; i < 10; i++)

{

if (i < 5)

{

counter++;

k -= i;

}

else

{

k +=1;

}

j += i;

}

Camel Case:

This naming convention has the first letter of the variable be lower case, and the first letter in each new word be capitalized (e.g. firstSecondThird). This applies for functions and member functions as well! The main exception to this is class names, where the first letter should also be capitalized.

Variable and Function Names:

Your variable and function names should be clear about what that variable or function is. Do not use one letter variables, but use abbreviations when it is appropriate (for example: “imag" instead of

“imaginary”). The more descriptive your variable and function names are, the more readable your code will be. This is the idea behind self-documenting code.











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File Headers:

Every file should have the following header at the top

/*

Author: <your name>

Class: ECE4122 or ECE6122

Last Date Modified: <date>

Description:

What is the purpose of this file?

*/

Code Comments:

    1. Every function must have a comment section describing the purpose of the function, the input and output parameters, the return value (if any).

    2. Every class must have a comment section to describe the purpose of the class.

    3. Comments need to be placed inside of functions/loops to assist in the understanding of the flow of the code.











































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