//19 结构体与函数//由于结构可以看作一个数据类型并且可以赋值，因为我们可以将结构传递到函数中，或者在函数中返回一个结构//按值返回我们知道需要复制返回的结构，结构体可以容纳不同的类型的变量，相应产生的问题是复制数据也很多，假如我们不想复制数据，那么就要按地址返回/*#include 
     
      using namespace std;struct time{	int hour;	int minute;};const int perhour = 60; //定义分钟数//time sum(time t1, time t2);time *sum(time t1, time t2);void show(time t);int main(){	time one ={8,15};	time two = {6,55};	time *day = sum(one,two);	cout<<"两天的时间总计:";	show(*day);		time day3 = {9,35};	cout<<"三天时间总计:";	//注意这里的day已经不是一个结构体变量，而是一个结构体地址	time *p = sum(*day,day3);	show(*p);    delete day;	delete p;	return 0;}time *sum(time t1, time t2){    //time total;	time *total = new time;	total->minute = (t1.minute + t2.minute) % perhour;	total->hour = t1.hour + t2.hour + (t1.minute + t2.minute) / perhour;	//total.minute = (t1.minute + t2.minute) % perhour;	//total.hour = t1.hour + t2.hour + (t1.minute + t2.minute) / perhour;	return total;}void show(time t){	cout<
      
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