Using multiple default parameter values: defaults for reference parameters : default arguments « Function « C++ Tutorial

1. C++ Tutorial
2. Function
3. default arguments

#include <iostream>
#include <iomanip>
#include <string>
using std::cout;
using std::endl;
using std::string;

void show_data(const int data[], int count = 1,
            const string& title = "Data Values", int width = 10, int perLine =5);

int main() {
  int data[] = {1, 2, 3, 4};

  int dataItem = 99;
  show_data (&dataItem);

  dataItem = 13;
  show_data(&dataItem, 1, "Unlucky for some!");

  show_data(data, sizeof data/sizeof data[0]);
  show_data(data, sizeof data/sizeof data[0], "title 1");
  show_data(data, sizeof data/sizeof data[0], "title 2", 14);
  show_data(data, sizeof data/sizeof data[0], "title 3", 14, 4);

  return 0;
}

void show_data (const int data[], int count, const string& title,int width, int perLine) {
  cout << endl << title;                    
  cout << endl << perLine;
  cout << endl << width << data[2];    
  cout << endl;
}

Data Values
5
102

Unlucky for some!
5
102

Data Values
5
103

title 1
5
103

title 2
5
143

title 3
4
143