Solution Review: Calculate Overall Percentage of Student's Mark

#include <iostream>
using namespace std;
// Student structure
struct Student {
  // Stores the name of Student
  string name;
  // Stores the marks of student in 4 subjects
  double marks[4];
};
// calculate_percentage function
double calculate_percentage(struct Student s) {
  // Initialize variables
  double total = 0, percentage = 0;
  // for loop to traverse marks of Student
  for (int i = 0; i < 4; i++) {
    // Add marks of Student in total
    total = total + s.marks[i];
  }
  // Calculate percentage
  percentage = (total / 400) * 100;
  // Return percentage of Student
  return percentage;
}
// print_Student function
void print_Student(struct Student s) {
  cout << "Name of student = " << s.name << endl;
  cout << "Student marks:" << endl;
  for (int i = 0; i < 4; i++) {
    cout << "Student marks in subject" << i + 1 << "=" << s.marks[i] << endl;
  }
}
// main function
int main() {
  // Declare structure variable s of type Student
  struct Student s;
  // Declare variable of type double
  double result;
  // Initialize members of s
  s = {"John",{30.5, 49.7, 22.3, 32.9}};
  // Call function calculate_percentage and store output in result
  result = calculate_percentage(s);
  // Call print_Student function to print members of s
  print_Student(s);
  // Print percentage of Student
  cout << "percentage = " << result << "%";
  return 0;
}