From 8128a05f2e9016079a85388278358890e47484a2 Mon Sep 17 00:00:00 2001
From: OpenBot Engineer <engineer@users.noreply.github.com>
Date: Thu, 12 Nov 2026 23:58:51 -0600
Subject: [PATCH] Add a classic C++ Hello World example.

A self-contained program under examples/hello_world that compiles with
g++/clang++ and prints a greeting to stdout. Includes a small Makefile.
---
 examples/hello_world/.gitignore |  2 ++
 examples/hello_world/Makefile   | 17 +++++++++++++++++
 examples/hello_world/README.md  | 19 +++++++++++++++++++
 examples/hello_world/main.cpp   |  6 ++++++
 4 files changed, 44 insertions(+)
 create mode 100644 examples/hello_world/.gitignore
 create mode 100644 examples/hello_world/Makefile
 create mode 100644 examples/hello_world/README.md
 create mode 100644 examples/hello_world/main.cpp

diff --git a/examples/hello_world/.gitignore b/examples/hello_world/.gitignore
new file mode 100644
index 0000000..04fbb97
--- /dev/null
+++ b/examples/hello_world/.gitignore
@@ -0,0 +1,2 @@
+hello_world
+hello_world.exe
diff --git a/examples/hello_world/Makefile b/examples/hello_world/Makefile
new file mode 100644
index 0000000..ea461b6
--- /dev/null
+++ b/examples/hello_world/Makefile
@@ -0,0 +1,17 @@
+CXX ?= g++
+CXXFLAGS ?= -std=c++17 -Wall -Wextra -Werror -O2
+
+.PHONY: all run test clean
+
+all: hello_world
+
+hello_world: main.cpp
+	$(CXX) $(CXXFLAGS) -o $@ main.cpp
+
+run: hello_world
+	./hello_world
+
+test: run
+
+clean:
+	rm -f hello_world
diff --git a/examples/hello_world/README.md b/examples/hello_world/README.md
new file mode 100644
index 0000000..ec938b7
--- /dev/null
+++ b/examples/hello_world/README.md
@@ -0,0 +1,19 @@
+# Hello World (C++)
+
+A classic Hello World program that prints a greeting to stdout.
+
+## Build and run
+
+Requires a C++17 compiler (`g++` or `clang++`).
+
+```bash
+cd examples/hello_world
+make run
+```
+
+Or without make:
+
+```bash
+g++ -std=c++17 -Wall -Wextra -Werror -O2 -o hello_world main.cpp
+./hello_world
+```
diff --git a/examples/hello_world/main.cpp b/examples/hello_world/main.cpp
new file mode 100644
index 0000000..bc8f460
--- /dev/null
+++ b/examples/hello_world/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    std::cout << "Hello, World!" << std::endl;
+    return 0;
+}