What is the role of function name in C++ function overloading?

In C, the function name plays a role in distinguishing overloaded functions. Each overloaded function has a unique function signature (including function name and parameter list), and the compiler determines which function to call based on the signature.

The role of function names in C function overloading

In C, function overloading allows you to create new files with the same name But multiple functions with different parameter lists. The function name is used to distinguish these functions among overloaded functions.

Principle

Each overloaded function has a unique function signature, which consists of the function name and parameter list. The compiler uses function signatures to determine which function is called in a specific call.

Syntax

The syntax of overloaded functions is as follows:

returnType functionName(parameterList) {
  // 函数体
}

Among them:

• returnType is the return type of the function.
• functionName is the name of the function.
• parameterList is the parameter list of the function, including parameter types and names.

Practical case

Consider the following overloaded functions for calculating area:

// 计算面积的重载函数
double area(int width, int height);
double area(double radius);

The first function calculates the area of ​​a rectangle, The second function calculates the area of ​​the circle. Although the two functions have the same name, they have different parameter lists. The compiler will determine which function to call based on the arguments provided when calling.

Usage Example

The following code uses these two overloaded functions to calculate the area of ​​a rectangle and the area of ​​a circle:

int main() {
  int width = 10;
  int height = 20;
  double radius = 5.0;

  // 计算矩形的面积
  double rectArea = area(width, height);

  // 计算圆的面积
  double circleArea = area(radius);

  // 打印结果
  std::cout << "矩形面积：" << rectArea << std::endl;
  std::cout << "圆形面积：" << circleArea << std::endl;

  return 0;
}

Output

矩形面积：200
圆形面积：78.5398

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