C++ Learning and Testing Repository

This repository contains a collection of C++ and CUDA programming experiments, learning projects, and problem-solving exercises.

Project Structure

Basic C++ Programs

• HelloWorld.cpp - Simple "Hello World" program demonstrating basic C++ output
• DevCppTest01/ - Another basic "Hello World" C++ program for testing Dev-C++ environment

CUDA Learning Projects

Three progressive CUDA examples demonstrating GPU programming concepts:

• CUDA_Test01/ - Basic CUDA "Hello World" with empty GPU kernel
• CUDA_Test02/ - Simple integer addition on GPU, demonstrates:
  • Memory allocation on GPU
  • Host-to-device data transfer
  • Kernel execution
  • Device-to-host data transfer
• CUDA_Test03/ - Vector addition template (incomplete implementation)

Mathematical Problem Solver

DevCppTest02/ - Comprehensive solution to a Vietnamese elementary school math puzzle that went viral in 2015:

The Puzzle

Fill in the blanks with digits 1-9 (each used exactly once):

_ + 13 × _ ÷ _ + _ + 12 × _ - _ - 11 + _ × _ ÷ _ - 10 = 66

Solution Components

• main.cpp - C++ brute force solver that generates combinations with unique digits
• pythonTest1.py - Python solution using itertools permutations (more elegant approach)
• Solutions.txt - Complete list of 136 valid solutions
• 1.txt through 9.txt - Generated digit combination files
• Link.txt - References to original news articles about the puzzle
• Math problem doc/ - Documentation and images related to the puzzle

References

The puzzle gained international attention when it appeared in a Vietnamese 3rd-grade math workbook:

• Gizmodo Article
• The Guardian Article

Building and Running

C++ Programs

g++ HelloWorld.cpp -o HelloWorld
./HelloWorld

CUDA Programs

Requires NVIDIA CUDA Toolkit:

nvcc kernel.cu -o cuda_program
./cuda_program

Math Puzzle Solver

# C++ version
g++ DevCppTest02/main.cpp -o puzzle_solver
./puzzle_solver

# Python version
python DevCppTest02/pythonTest1.py

Learning Objectives

This repository demonstrates:

• Basic C++ programming concepts
• CUDA GPU programming fundamentals
• Algorithmic problem solving
• Combinatorial mathematics
• Cross-language problem solving (C++ vs Python approaches)