C++PrimerPlus(第6版)中文版：Chapter7.6

本例子声明了一个结构体travel_time,一个函数用于求两个结构体的和，一个函数用于显示结构体的各个部分。

// Chapter7.6_Example7.11travel.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include 
struct travel_time
{
    int hours;
    int mins;
};
const int Mins_per_hr = 60;
travel_time sum(travel_time t1,travel_time t2);
void show_time(travel_time t);

int main()
{
  //  std::cout << "Hello World!n";
    using namespace std;
    travel_time day1 = {5,45};
    travel_time day2 = { 4,55 };

    travel_time trip = sum(day1,day2);
    cout << "Two days total:";
    show_time(trip);

    travel_time day3 = { 4,32 };
    cout << "Three days total:";
    show_time(sum(trip,day3));
    return 0;
}
 
travel_time sum(travel_time t1, travel_time t2)
{
    travel_time total;
    total.hours = t1.hours + t2.hours+ (t1.mins + t2.mins) /Mins_per_hr;
    total.mins = (t1.mins + t2.mins) % Mins_per_hr;

    return total;
}
void show_time(travel_time t)
{
    using namespace std;
    cout << t.hours << "hours," << t.mins << "minutesn";
}

结果如下：

Two days total:10hours,40minutes
Three days total:15hours,12minutes