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Functions in C++ are fundamental building blocks that encapsulate code for specific tasks, promoting reusability and modularity. Here's a structured overview: 1. **Function Syntax**    - **Definition**:       ```cpp      returnType functionName(parameters) {          // Code          return value; // Omitted if returnType is void      }      ```      Example:      ```cpp      int add(int a, int b) {          return a + b;      }      ```    - **Declaration (Prototype)**:       ```cpp      returnType functionName(parameters); // Informs the compiler about the function.      ```  2. **Parameters and Arguments**    - **Pass by Value**: Copies arguments; changes inside the function don't affect t...

Functions in C# In C#, functions are blocks of code that perform specific tasks. They are essential for breaking down complex programs into smaller, more manageable units. This modular approach improves code readability, reusability, and maintainability. Basic Structure of a Function: [access_modifier] return_type function_name(parameter_list) {     // Function body     // ...     return value; // Optional, if return_type is not void } Key Components:  * Access Modifier:    * public: Accessible from anywhere.    * private: Accessible only within the same class.    * protected: Accessible within the same class and its derived classes.    * internal: Accessible within the same assembly.  * Return Type:    * Specifies the data type of the value returned by the function.    * void: Indicates that the function doesn't return any value.  * Function Name:    * A unique identifier ...