From 35559dd585389a54a404cad228b73bb72d6dded1 Mon Sep 17 00:00:00 2001
From: Jidong Xiao <xiaoj8@rpi.edu>
Date: Tue, 16 Jan 2024 16:26:11 -0500
Subject: [PATCH] renaming two lectures

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 lectures/05_classes_II/README.md      | 101 ------------
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diff --git a/lectures/04_pointers/README.md b/lectures/04_pointers/README.md
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-# Lecture 4 --- Pointers, Arrays, & Pointer Arithmetic
-
-- Pointers store memory addresses.
-- They can be used to access the values stored at their stored memory address.
-- They can be incremented, decremented, added, and subtracted.
-- Dynamic memory is accessed through pointers.
-- Pointers are also the primitive mechanism underlying vector iterators, which we have used with std::sort and
-will use more extensively throughout the semester.
-
-## 4.1 Pointer Example
-
-- Consider the following code segment:
-
-```cpp
-float x = 15.5;
-float *p; /* equiv: float* p; or float * p; */
-p = &x;
-*p = 72;
-if ( x > 20 )
-cout << "Bigger\n";
-else
-cout << "Smaller\n";
-```
-
-The output is Bigger
-because x == 72.0. What’s going on?
-
-![alt text](pointer_init.png "pointer_init")
-
-## 4.2 Pointer Variables and Memory Access
-
-- x is an ordinary float, but p is a pointer that can hold the memory address of a float variable. The difference
-is explained in the picture above.
-- Every variable is attached to a location in memory. This is where the value of that variable is stored. Hence,
-we draw a picture with the variable name next to a box that represents the memory location.
-- Each memory location also has an address, which is itself just an index into the giant array that is the computer
-memory.
-- The value stored in a pointer variable is an address in memory. The statement p = &x; takes the address
-of x’s memory location and stores it (the address) in the memory location associated with p.
-- Since the value of this address is much less important than the fact that the address is x’s memory location,
-we depict the address with an arrow.
-- The statement: *p = 72; causes the computer to get the memory location stored at p, then go to that
-memory location, and store 72 there. This writes the 72 in x’s location.
-
-Note: *p is an l-value in the above expression.
-
-- play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/pointers/example1/index.html).
-
-## 4.3 Defining Pointer Variables
-
-- In the example below, p, s and t are all pointer variables (pointers, for short), but q is NOT. You need the *
-before each variable name.
-```cpp
-int * p, q;
-float *s, *t;
-```
-- There is no initialization of pointer variables in this two-line sequence, so the statement below is dangerous,
-and may cause your program to crash! (It won’t crash if the uninitialized value happens to be a legal address.)
-```cpp
-*p = 15;
-```
-
-- play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/pointers/example2/index.html).
-
-## 4.4 Operations on Pointers
-
-- The unary (single argument/operand) operator * in the expression *p is the “dereferencing operator”. It means
-“follow the pointer”. *p can be either an l-value or an r-value, depending on which side of the = it appears on.
-- The unary operator & in the expression &x means “take the memory address of.”
-- Pointers can be assigned. This just copies memory addresses as though they were values (which they are).
-Let’s work through the example below (and draw a picture!). What are the values of x and y at the end?
-```cpp
-float x=5, y=9;
-float *p = &x, *q = &y;
-*p = 17.0;
-*q = *p;
-q = p;
-*q = 13.0;
-```
-- play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/pointers/example3/index.html).
-
-- Assignments of integers or floats to pointers and assignments mixing pointers of different types are illegal.
-Continuing with the above example:
-```cpp
-int *r;
-r = q; // Illegal: different pointer types;
-p = 35.1; // Illegal: float assigned to a pointer
-```
-- Comparisons between pointers of the form if ( p == q ) or if ( p != q ) are legal and very
-useful! Less than and greater than comparisons are also allowed. These are useful only when the pointers are
-to locations within an array.
-
-## 4.5 Exercise
-
-- Draw a picture for the following code sequence. What is the output to the screen?
-
-```cpp
-int x = 10, y = 15;
-int *a = &x;
-cout << x << " " << y << endl;
-int *b = &y;
-*a = x * *b;
-cout << x << " " << y << endl;
-int *c = b;
-*c = 25;
-cout << x << " " << y << endl;
-```
-
-- play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/pointers/example4/index.html).
-
-## 4.6 Null Pointers
-
-- Like the int type, pointers are not default initialized. We should assume it’s a garbage value, leftover from
-the previous user of that memory.
-- Pointers that don’t (yet) point anywhere useful are often explicitly assigned to NULL.  
-  - NULL is equal to the integer 0, which is a legal pointer value (you can store NULL in a pointer variable).  
-  - But NULL is not a valid memory location you are allowed to read or write. If you try to dereference or
-follow a NULL pointer, your program will immediately crash. You may see a segmentation fault, a bus
-error, or something about a null pointer dereference.  
-  - NOTE: In C++11, we are encouraged to switch to use **nullptr** instead of NULL or 0, to avoid some
-subtle situations where NULL is incorrectly seen as an int type instead of a pointer. For this course we
-will assume NULL and nullptr are equivalent.  
-  - We indicate a NULL or nullptr value in diagrams with a slash through the memory location box.  
-  - Comparing a pointer to NULL is very useful. It can be used to indicate whether or not a pointer variable is
-pointing at a useable memory location. For example,
-```cpp
-if ( p != NULL )
-cout << *p << endl.
-```
-tests to see if p is pointing somewhere that appears to be useful before accessing and printing the value stored
-at that location.
-- But don’t make the mistake of assuming pointers are automatically initialized to NULL.
-
-## 4.7 Arrays
-
-- Here’s a quick example to remind you about how to use an array:
-```cpp
-const int n = 10;
-double a[n];
-int i;
-for ( i=0; i<n; ++i ){
-    a[i] = sqrt( double(i) );
-}
-```
-<!--both double(i) and (double)i would work, they are the same.-->
-- Remember: the size of array a is fixed at compile time. STL vectors act like arrays, but they can grow and
-shrink dynamically in response to the demands of the application.
-
-- play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/pointers/example_arrays_1/index.html).
-
-## 4.8 Stepping through Arrays with Pointers (Array Iterators)
-
-- The array code above that uses [] subscripting, can be equivalently rewritten to use pointers. We can re-write it in two ways:
-
-### 4.8.1 First Approach
-
-```cpp
-const int n = 10;
-double a[n];
-double *p;
-for ( p=a; p<a+n; ++p ){
-    *p = sqrt( p-a );
-}
-```
-- The assignment: *p = a*; takes the address of the start of the array and assigns it to *p*.
-- This illustrates the important fact that the name of an array is in fact a pointer to the start of a block of memory. We will come back to this several times! We could also write this line as: *p = &a[0]*; which means “find the location of a[0] and take its address”.
-- By incrementing, *++p*, we make *p* point to the next location in the array.
-  – When we increment a pointer we don’t just add one byte to the address, we add the number of bytes (sizeof) used to store one object of the specific type of that pointer. Similarly, basic addition/subtraction of pointer variables is done in multiples of the sizeof the type of the pointer.
-  – Since the type of *p* is double, and the size of double is 8 bytes, we are actually adding 8 bytes to the address when we execute *++p*.
-
-- The test *p&lt;a+n* checks to see if the value of the pointer (the address) is less than n array locations beyond
-the start of the array. In this example, *a+n* is the memory location 80 bytes after the start of the array (n = 10 slots * 8 bytes per
-slot). We could equivalently have used the test *p != a+n*.
-- In the assignment:
-```cpp
-*p = sqrt( p-a );
-```
-*p-a* is the number of array locations (not number of byte, although each slot is 8 bytes) between *p* and the start. **This is an integer**. The
-square root of this value is assigned to \*p.
-
-- Note that there may or may not be unused memory between your array and the other local variables. Similarly, the order that your local variables appear on the stack is not guaranteed (the compiler may rearrange things a bit in an attempt to optimize performance or memory usage). A buffer overflow (attempting to access an illegal array index) may or may not cause an immediate failure – depending on the layout of other critical program memory.
-
-- play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/pointers/example_arrays_2/index.html).
-
-### 4.8.2 Second Approach
-
-The first approach uses pointer arithmetic in several places - just to demonstrate the usage of pointer arithmetic; but many students find it confusing and hard to understand. In contrast, the following approach is easier to understand, and **is the recommended way for you to use in tomorrow's lab**; use the first approach only if you truly understand all the pointer arithmetics involved in that approach.
-
-```cpp
-const int n = 10;
-double a[n];
-double *p;
-p = a;
-int i;
-for ( i=0; i<n; ++i ){
-    *(p+i) = sqrt( double(i) );
-};
-```
-
-This second approach also "nicely mimics the subscript notation used in the (original) for loop above, which highlights that fundamentally array subscripts are just pointer arithmetic." - comments by our mentor Eleanor Olson, :smile:.
-
-## 4.9 Sorting an Array
-
-- Arrays may be sorted using std::sort, just like vectors. Pointers are used in place of iterators. For example, if a is an array of doubles and there are n values in the array, then here’s how to sort the values in the array into increasing order:
-
-```cpp
-std::sort( a, a+n );
-```
-
-## 4.10 Exercises
-
-- [Leetcode problem 26: Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/). Solution: [p26_removeduplicates.cpp](../../leetcode/p26_removeduplicates.cpp)
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diff --git a/lectures/05_classes_II/README.md b/lectures/05_classes_II/README.md
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-# Test 1 Information
-<!--  – Students will be randomly assigned to a test room and seating zone – will be on Submitty Wednesday
-morning.
-  – If you haven’t filled out the “Left or Right Handed” gradeable by Tuesday night, we will assume you are
-right handed. This is used for seating assignments.-->
-- Test 1 will be held **Thursday, 09/21/2023 from 6-7:50pm**.  
-  – No make-ups will be given except for pre-approved absence or illness, and a written excuse from the Dean
-of Students or the Student Experience office or the RPI Health Center will be required.  
-  – If you have a letter from Disability Services for Students and you have not already emailed it to
-ds_instructors@cs.rpi.edu, please do so ASAP. Shianne Hulbert will be in contact with you about
-your accommodations for the test.
-- Coverage: Lectures 1-6, Labs 1-3, and Homeworks 1-2.
-<!--  – Practice problems from previous exams are available on the course website (Friday morning). Solutions
-to the problems will be posted Monday morning. The best way to prepare is to completely work through
-and write out your solution to each problem, before looking at the answers.-->
-- OPTIONAL: you are allowed two physical pieces of 8.5x11” paper, that’s four “sides”. We will not collect these electronically and we will not pre-print them, you will have to bring these notes pages yourself if you want them. We will check at the start of the exam that you do not have more than two pieces of paper for your notes!
-<!-- - OPTIONAL: Prepare a 2 page, black & white, 8.5x11”, portrait orientation .pdf of notes you would like to
-have during the exam. This may be digitally prepared or handwritten and scanned or photographed. The file
-may be no bigger than 2MB. You will upload this file to Submitty (“Test 1 Notes Upload”) before Wednesday
-night @11:59pm. We will print this and attach it to your exam. Make sure you get credit for test case 2 and
-that you view the details to verify your sheet looks correct. You cannot bring your own cribsheet, you must
-submit one electronically.
-IMPORTANT: Using third party websites to make a PDF may generate an invalid PDFs that prints weird. Your
-word processor’s -> save as/export to PDF, or Google Docs -> Download -> PDF should be safe.-->
-- Bring to the exam room:  
-  – Your Rensselaer photo ID card.  
-  – Pencil(s) & eraser (pens are ok, but not recommended). The exam will involve handwriting code on paper (and other short answer problem solving). Neat legible handwriting is appreciated. We will be somewhat forgiving to minor syntax errors – it will be graded by humans not computers.  
-  – Computers, cell-phones, smart watches, calculators, music players, etc. are not permitted. Please do not bring your laptop, books, backpack, etc. to the exam room – leave everything in your dorm room. Unless you are coming directly from another class or sports/club meeting.
-<!--  – Do not bring your own scratch paper. We will provide scratch paper. -->
-
-# Lecture 5 ---  Classes II: Sort, Non-member Operators
-
-- Classes in C++;
-- Non-member operators
-
-## 5.1 C++ Classes
-
-- Nuances to remember
-
-  - Within class scope (within the code of a member function) member variables and member functions of
-that class may be accessed without providing the name of the class object.  
-  - Within a member function, when an object of the same class type has been passed as an argument, direct
-access to the private member variables of that object is allowed (using the ’.’ notation).
-
-## 5.2 Operator Overloading
-
-- When sorting objects of a custom class, we can provide a third argument to the sort function, and this third argument is a comparison function.
-- What if we do not want to provide this third argument? The answer is: define a function that creates a < operator for objects of that class! At first, this seems a bit weird, but it is extremely useful.
-- Let’s start with syntax. The expressions a < b and x + y are really function calls!
-Syntactically, they are equivalent to operator< (a, b) and operator+ (x, y) respectively.
-- When we want to write our own operators, we write them as functions with these weird names.
-- For example, if we write:
-
-```cpp
-bool operator< (const Date& a, const Date& b) {
-return (a.getYear() < b.getYear() ||
-(a.getYear() == b.getYear() && a.getMonth() < b.getMonth()) ||
-(a.getYear() == b.getYear() && a.getMonth() == b.getMonth() && a.getDay() < b.getDay()));
-}
-```
-then the statement
-
-```cpp
-sort(dates.begin(), dates.end());
-```
-will sort Date objects into chronological order.
-- Really, the only weird thing about operators is their syntax.
-- We will have many opportunities to write operators throughout this course. Sometimes these will be made class member functions, but more on this in a later lecture.
-
-## 5.3 Questions
-
-- Can you solve leetcode problem 905 with an overloaded operator &lt;, and make this overloaded operator &lt; a non-member function?
-- Can you solve leetcode problem 905 with an overloaded operator &lt;, and make this overloaded operator &lt; a member function?
-- Can you solve leetcode problem 905 with an overloaded operator &lt;, and make this overloaded operator &lt; a member function, plus make the definition of this member function outside of the class definition?
-
-## 5.4 Copy Constructor
-
-- A copy constructor is a constructor which is used to create a new object as a copy of an existing object of the same class.
-- Copy constructors are automatically generated by the compiler if you do not provide one explicitly. However, if your class uses dynamic memory (which will be covered in next lecture), and you want a copy constructor, then you must write your own copy constructor.
-- Copy constructors get called when you create a new object by copying an existing object using the assignment operator (=), or when you pass an object by value to a function.
-- Still use the *Date* class as an example, if you have defined your own copy constructor whose prototype is like:
-
-```cpp
-Date(const Date &other);
-```
-
-and when you have the following lines of code:
-
-```cpp
-Date a;
-Date b = a;
-```
-
-The first statement will call the default constructor, while the second statement will call the copy constructor.
-
-## 5.5 Exercises
-
-- [Leetcode problem 56: Merge Intervals](https://leetcode.com/problems/merge-intervals/). Solution: [p56_mergeintervals.cpp](../../leetcode/p56_mergeintervals.cpp)
-- [Leetcode problem 905: Sort Array By Parity](https://leetcode.com/problems/sort-array-by-parity/). Solution: [p905_sortarraybyparity.cpp](../../leetcode/p905_sortarraybyparity.cpp)
-- [Leetcode problem 1929: Concatenation of Array
-](https://leetcode.com/problems/concatenation-of-array/). Solution: [p1929_concatenationofarray.cpp](../../leetcode/p1929_concatenationofarray.cpp)