Sample programs

C language

• Matrix traversal: Traversing matrix row wise in C is more efficient than column wise.
• Function pointers in C: Function pointer array in C language.
• Matrix as 1-D array: Demonstration of matrix as 1-D array.
• Run shell command in C: Run shell command in C program and gather the output, Eg: Find PID of a running process.
• Delete a line: Delete a line from file using line number.
• Block scope in C: Block scope of variable in C.
• Connect MySQL: Connect with mysql and execute sample query.
• Print timestamp in C: Print time stamp with milliseconds precision.
• NULL pointer in C: NULL pointer in C.
• Memset in C: Memset demo in C.
• Print long string in C: Print long string in C.
• Comma operator in C: Usage of comma operator in C.
• Print without semicolon: Print anything without using semicolon in C.
• Macro braces in macros: Importance of parenthesis in using macros.
• Hex buffers: Prints data in structure as buffer of hex numbers.
• Own strcmp: strcmp implemented.
• Strlen in C: Few tests for strlen function behaviour.
• Token pasting operator in C: Demo to use token pasting operator (##) in C.
• Hide password: Program to hide password while typing.
• Multithreading in c: Sample program to create threads in C.

Python

• Unpack list and dictionary: How to unpack list and dictionaries when passed as function arguments.
• Send mail using SMTP: Script to send mail using SMTP from linux machine.
• Pass string values to SQL query: Pass multiple string parameters to SQL query.
• Function pointer in python: Simulate function pointer(as in C language) in python.
• Memoization using function: Program to show memoization using function decorator.
• Fibonacci number, memoization using class: Performance comparison to find nth fibonacci(using recursive approach) number with and without memoization.
• Named-tuples: Few snippets to work with named tuples in python.
• Optional mutable arguments: Optional mutable arguments retains its value in subsequent calls.
• Connect MySQL in python: Python program to connect and execute query on MySQL.
• Slots usage in python: slots usage in python, Used to save memory when large number of objects are created.
• Map, filter, reduce: Map, filter and reduce in python.
• new usage: Overwriting new method to implement singleton pattern.
• Singleton pattern, using new: Implement singleton in python by overwriting new method.
• Singleton pattern, using decorator: Implement singleton in python using decorator. This is recommended way of singleton pattern.
• Make class iterable: Make an user defined class iterable, define iter and next.
• Define a class: Define a class and instance methods.
• Data/Static class variables: Create, access and update class/static variables.
• Data hiding: Private(name mangling) data members in python
• Static and class methods: Static and class methods.
• Method overriding: Method overriding in python
• Check object's membership: Check object membership using isinstance() and issubclass().
• Access members of parents class: How to access methods and members of parent class from derived class.
• Multiple inheritance: Multiple inheritance in python.
• Lamda demo: Lambda operator in python.
• Enumerate and zip: Enumerate and zip in python.
• Generators: Usage of generators in python.
• Property: Defining and using property in python.
• Decorator: Decorator usage.
• Decorator with arguments: Decorator with arguments.
• Threading module: Example to show threading module usage.
• Thread module: Example to show thread and lock usage in python.
• Custom context manager using class: Impelement custom context manager using class.
• Custom context manager using contextlib: Implement custom context manager using contextlib module.
• String templates: String templates in python.
• Sets demo: Set declaration and operations on them.
• class object callable: call() demo, make class name and it's object callable.
• Operator overloading: Operator overloading demo, show how '+' can be overloaded to add user defined objects.
• Closures demo: Closures demo in python.
• Global variables: Declare and access global variable in python.
• Numpy basics: Basic functions, operations in python numpy.
• Pandas basics: Basic functions, operations in pythons pandas.
• Heap module: heapq module in python - In built min heap.
• Telnet module: Check if (IP, PORT) is running using telnet.
• Log rotation: Log rotation example.
• Ping pong concurrency: Print ping pong using 2 threads running in synchronization.

CPP

• Strings in C++: Basic operations with strings in C++.
• Vectors: Basic functions/operations on C++ vectors.
• HashMaps: Basic operations with C++ hash maps.

Golang

• Notes: Golang notes.
• Snippets: Some golang code snippets.
• Slice and bool: Slice and bool demo in goLang.
• Init and main execution: Show sequence of execution of init() and main().
• Flags package: flags package usage.
• Interface type: Use interface type function argument if multiple types are expected.
• Ping pong concurrency: Print ping pong using 2 goroutines running in synchronization.
• Implement set: Implement set in golang.
• Print stack trace: Print stack trace in golang.

Others

• Merge PDFs first page: Script to merge first page of all PDF files found in current directory and sub-directories.
• Compare database: Compares 2 sqlite3 database files.
• Check database integrity: Checks sqlite3 database integrity and copies from backup if corrupted.
• Replace strings: Replaces set of strings to corresponding new ones.
• List git taggers: List all git taggers.