如何通过time.h ...输入将来的时间，以及如何找到"check in"之间的时间差.和“结帐时间"? [英] how to input a time which is in the future through time.h .....and how to find time difference between the "check in" and "check out time"?

问题描述

struct tm * timeinfo;
 
  time ( &rawtime );
  timeinfo = localtime ( &rawtime );
 cout<<"The Check in time is : " <<asctime (timeinfo);
 ofstream customerfile ("customers.txt", ios::out | ios::app );
 
string day;
string month;
string date;
cout<<"Please fill the check out time data :"<<endl;
 
cout<<"The Day of check out : \n";
cin>>day;
cout<<"The Month of check out : \n";
cin>>month;
cout<<"The Date of check out  : \n";
cin>>date;
string chkout = day + month + date + (asctime (timeinfo)+10);

if (customerfile.is_open())
{
customerfile<< asctime (timeinfo)<<","<< chkout<<"\n";}
customerfile.close();
				
				
				
				system ("pause");
				goto Main_Menu;
				break;
			}

推荐答案

使用mktime函数创建将来的时间.
将值填写在tm结构中，并将其传递给mktime函数.

要获取两个时间值之间的差，请使用difftime函数.

Use the mktime function to create a future time.
Fill in the values in a tm structure and pass this to the mktime function.

To get the difference between 2 time values, use the difftime function.

在使用C ++时，请不要运行到 ^ ]并获取其库的最新版本.日期/时间库非常干净且实用，但是会在编译时浪费时间(每个源文件几秒钟).

As you''re using C++ I''d run, not walk over to Boost[^] and grab the latest version of their library. The date/time library is pretty clean and functional but it''ll clonk some time on your compilation (a couple of seconds per source file).

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