c++ - 如何从C++中的字符串ID中提取int日、月和年

Question

我是在大学里开始做这个程序的，但我还有一些功能需要在家里做:getBirthday 和 age。如何从字符串 ID 中获取日、月、年作为整数？

我尝试只使用字符串，但它不起作用。

#include <iostream>
#include <string>
using namespace std;

enum Sex {male,female,unknown};  //const
class Person   //class
{
private:
    string name;
    string ID;   //this is the problem
    Sex pol;
....
void getBirthday(int &day,int&month,int&year)  //even if i use string for day...it is not working
{}
...
int main()
{Person p1("ALEX","9510167954")...;}   //95-year,10-month,16-day*this is what my teacher wrote

我期望输出:16/10/95

Answer 1

尝试初始化 getBirthday( ) 参数如下:

day = stoi(ID.substr(0,2));
month = stoi(ID.substr(2, 2));
year = stoi(ID.substr(4, 2));