Object Oriented Programming Using C++

C++ programs I wrote for Object Oriented Programming Using C++ at REVA University, Bengaluru (B.Tech, 2019). The whole OOP progression — from cout/cin up through operator overloading, inheritance, virtual functions, templates, exceptions, file handling and the STL — plus the lab manual programs in lab/.

145 programs. Written following Balagurusamy, so the style is classic C++: using namespace std;, one class per file, nothing fancy.

Structure

Folders in the order the topics were taught. Each builds on the one before.

Folder	Topic	Files
01-basics/	cout/cin, data types, operators, control flow, references	14
02-functions/	Overloading, default args, inline, call by value/reference/pointer, recursion	11
03-classes-and-objects/	Classes, members, this, static members, friend functions and classes	15
04-constructors-destructors/	Default/parameterized/copy constructors, destructors, deep copy	11
05-operator-overloading/	Unary, binary, friend, <</>>, [], =	12
06-inheritance/	Single, multiple, multilevel, hierarchical, hybrid, virtual base	13
07-polymorphism/	Overriding, virtual functions, pure virtual/abstract, virtual destructors	10
08-templates/	Function and class templates, multiple params, specialization	8
09-exception-handling/	try/catch/throw, multiple catch, custom exceptions, rethrow	8
10-file-handling/	Text and binary I/O, objects to file, random access	9
11-stl/	vector, list, map, set, stack, queue, iterators, algorithms	12
12-projects/	Menu-driven programs and full classes (complex, matrix, string)	6
lab/	The 16 numbered lab-manual programs	16

Compiling

Every program is standalone. Compiled in the lab with g++:

cd 05-operator-overloading
g++ -std=c++14 BinaryPlusComplex.cpp -o complex
./complex

The file-handling programs write plain files (data.txt, student.dat) into the current directory. The STL folder is the only place that leans on auto and range-based for — everything before it is written the long way, the way it was taught first.

The two lessons this course is really about

• Deep copy. A class that holds a char* (or any new-ed memory) needs its own copy constructor, or two objects end up sharing the same pointer and the destructor frees it twice. 04-constructors-destructors/DeepCopyString.cpp and 12-projects/StringClass.cpp do it properly; the commit history shows the version that didn't.
• Virtual destructors. Delete a derived object through a base pointer and the derived destructor only runs if the base destructor is virtual. 07-polymorphism/VirtualDestructor.cpp prints both destructor messages because of that one keyword.

Projects

The six in 12-projects/:

• StudentRecordSystem / BankingSystem / LibraryManagement — menu-driven, class + records, while(1) + switch.
• ComplexNumberClass — a full complex class with + - *, magnitude and <<.
• MatrixClass — matrix addition and multiplication through operator overloading.
• StringClass — a small mystring reimplementation with a proper deep copy, concat, length and compare.

Lab

lab/ holds the 16 numbered exercises from the lab manual, each opening with its problem statement and the compile command, because the lab record required both. Lab14_FileObjectRecords (writing student objects to a binary file and reading them back) and Lab15_MatrixOperations are the two everyone remembers from the practical exam.