How to declare static functions in C++?

A static function is a function that does not belong to any class and is used to perform auxiliary tasks or provide global functionality. In C, static functions are declared with the following syntax: static type function_name(parameters), where the static keyword indicates that the function is static, type is the return value type, function_name is the function name, and parameters is the parameter list.

C Static function declaration

A static function is a function that does not belong to any class and is usually used to perform auxiliary tasks or provide global functionality. In C, a static function can be declared with the following syntax:

static type function_name(parameters) { ... }

where:

• static keyword indicates that the function is static.
• type is the function return value type, which can be any valid C data type.
• function_name is the function name.
• parameters is the function parameter list, which can be any number and type of parameters.
• The function body contains the code to be executed.

Syntax example:

static int sum(int a, int b) {
  return a + b;
}

Practical case

Suppose we want to write a program that calculates the average grade of students. We can define a static function calculate_average to perform this task:

#include <iostream>

using namespace std;

static double calculate_average(int scores[], int size) {
  double sum = 0;
  for (int i = 0; i < size; i++) {
    sum += scores[i];
  }
  return sum / size;
}

int main() {
  // 定义学生成绩数组
  int scores[] = {85, 90, 75, 95};
  int size = sizeof(scores) / sizeof(int);

  // 调用静态函数计算平均成绩
  double average = calculate_average(scores, size);

  // 输出平均成绩
  cout << "平均成绩: " << average << endl;

  return 0;
}

In this example, the static function calculate_average is used to calculate the average of a set of scores in an array value and called through the main() function.

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