CPP notes

- blocked-based class structure
- pointer vs reference

Author: xy-241

content/C/CPP Notes.md

@@ -6,7 +6,7 @@ Author Profile:
 tags:
   - cpp
 Creation Date: 2024-12-14, 20:50
-Last Date: 2024-12-14T21:03:15+08:00
+Last Date: 2024-12-16T22:07:33+08:00
 References: 
 draft: 
 description: 
@@ -29,4 +29,35 @@ description:
 auto variable_name = expression;
 ```
 
-- The [[Language Processors#Compiler]] is able to figure out the [[Datatype]] of `expression` during compilation automatically
+- The [[Language Processors#Compiler]] is able to figure out the [[Datatype]] of `expression` during compilation automatically
+
+## Block-based Class Structure
+---
+```cpp
+class Node {
+private:
+    int val;      // This is private by default
+    int freq;
+
+public:
+	Node(int val, int freq) { 
+		this->val = val;
+		this->freq = freq; 
+	}
+};
+
+```
+
+- In C++, [[Access Modifier|access modifiers]] (`public`, `private`, `protected`) are **block-based**. They apply to all members declared after them until another access modifier appears
+
+
+## Pointer vs Reference
+---
+```cpp
+int* ptr = &x; // Pointer points to the address of x
+
+int& ref = x; // Create a reference to x
+```
+
+- References in C++ are **an alias** for an existing variable
+- For [[C Structure|structure]], accessing attributes with pointer to a structure requires `->`, but reference can access directly with `.`