Merge 424f6c2b9e into 0931c8fc67

languages/c++.cpp

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+Prepossesor directives:
+
+- #include <iostream> ## #include is used to include content of another file in your c++ code 
+- #define PI 3.14159 ## #define - Used to define macros.Macros are pieces of code that are replaced by a specific value
+- #pragma once This directive provides implementation-specific instructions to the compiler. It is often used for compiler-specific features or optimizations.