如何解析和验证C ++中的std :: string中的日期？ [英] How to parse and validate a date in std::string in C++?

问题描述

我正在一个项目，我必须读一个日期，以确保它是一个有效的日期。例如，2月29日只是闰年的有效日期，或6月31日不是有效的日期，因此计算机将根据输入输出该信息。我的问题是，我不知道如何解析字符串，以便用户可以输入05/11/1996作为日期（例如），然后把它，并将其放入单独的整数。我正在想用一个while循环和字符串流做一些事情，但我有点卡住。

I'm working on a project where I have to read a date to make sure that it's a valid date. For example, February 29th is only a valid date on leap years, or June 31st is not a valid date, so the computer would output that information based on the input. My issue is that I can't figure out how to parse the string so that the user can enter "05/11/1996" as a date (for example) and then take that and put it into seperate integers. I was thinking about trying to do something with a while loop and string stream, but I'm a little stuck. If someone could help me with this, I would really appreciate it.

推荐答案

如果格式像你的例子中一样，你可以取出整数如下：

If the format is like in your example, you could take out the integer like this:

int day, month, year;
sscanf(buffer, "%2d/%2d/%4d",
    &month,
    &day,
    &year);

当然在缓冲区中你有日期（05/11/1996）

where of course in buffer you have the date ("05/11/1996" )

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