C++ Function Types with Examples

 

C++ Function Types with Examples

C++ offers various function types depending on their parameters, return values, and special characteristics. Here's a breakdown of some common types with examples:

1. Functions with no arguments and no return value:

C++

void greet() {
  std::cout << "Hello, world!" << std::endl;
}

int main() {
  greet(); // calls the greet function
  return 0;
}

Use code with caution.

2. Functions with arguments and no return value:

C++

void printNumber(int num) {
  std::cout << "The number is: " << num << std::endl;
}

int main() {
  printNumber(10); // calls printNumber with argument 10
  return 0;
}

Use code with caution.

3. Functions with no arguments and a return value:

C++

int getYear() {
  return 2024; // returns the current year (assuming it's 2024)
}

int main() {
  int currentYear = getYear();
  std::cout << "Current year: " << currentYear << std::endl;
  return 0;
}

Use code with caution.

4. Functions with arguments and a return value:

C++

int addNumbers(int a, int b) {
  return a + b;
}

int main() {
  int sum = addNumbers(5, 3);
  std::cout << "Sum: " << sum << std::endl;
  return 0;
}

Use code with caution.

5. Void functions: These functions are declared with void as the return type and don't return any value.

6. Non-void functions: These functions return a value of a specific type (e.g., int, double, string).

7. Inline functions: These functions are declared with the inline keyword and are intended to be small and frequently used, potentially being optimized for faster execution.

8. Member functions: These functions are defined within a class and operate on objects of that class.

9. Friend functions: These functions are declared outside a class but have access to its private members.

10. Function pointers: These variables store the memory address of a function, allowing them to be passed around and dynamically called.

11. Lambda expressions: These are short, anonymous functions defined using square brackets [] syntax, often used for simple operations within larger code blocks.