What are the return value type options for C++ functions?

The return value type of a C function specifies the result type of the function call. Available return value types include: Basic types: int, float, double, char, bool Custom types: structure, class, union void (no value is returned)

C function return value type

In C, the return value type of a function specifies the result type of the function call. This article will discuss the return value types available in C and illustrate them with practical examples.

Basic types

C supports multiple basic types, including:

• int: Integer type
• float: floating point type
• double: double precision floating point type
• char: character type
• bool: Boolean type (true/false)

Custom type

In addition to basic types, You can also create your own custom types, such as structures, classes, and unions.

void

void means the function does not return any value. This is typically used for handlers or performing specific operations without producing a return value.

Practical case

The following is an example of a C function using basic return value types:

int sumNumbers(int num1, int num2) {
  return num1 + num2;
}

int main() {
  int result = sumNumbers(10, 20);
  std::cout << "Sum: " << result << std::endl;
  return 0;
}

In the above case, sumNumbers The function accepts two integer parameters and returns their sum.

Example of using a custom return value type:

struct Point {
  int x, y;
};

Point createPoint(int x, int y) {
  return {x, y};
}

int main() {
  Point point = createPoint(1, 2);
  std::cout << "Point: " << point.x << ", " << point.y << std::endl;
  return 0;
}

In this example, the createPoint function returns a custom Point structure, where Contains x and y coordinates.

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