stoi的例子

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

class My_Date
{
public:
    My_Date(const string &s);
    unsigned year;
    unsigned month;
    unsigned day;
};

My_Date::My_Date(const string &s)
{
    unsigned format=0;
    if(s.find_first_of("/")!=string::npos)
        format=0x10;
    if(s.find_first_of(",")!=string::npos)
        format=0x01;
    switch(format)
    {
    case 0x10:
        day=stoi(s.substr(0,s.find_first_of("/")));
        month=stoi(s.substr(s.find_first_of("/")+1,s.find_last_of("/")-s.find_first_of("/")));
        year=stoi(s.substr(s.find_last_of("/")+1,4));
        break;
    case 0x01:
        day=stoi(s.substr(s.find_first_of("0123456789"),s.find_first_of(",")-s.find_first_of("0123456789")));
        if(s.find("Jan")<s.size()) month=1;
        if(s.find("Feb")<s.size()) month=2;
        if(s.find("Mar")<s.size()) month=3;
        if(s.find("Apr")<s.size()) month=4;
        if(s.find("May")<s.size()) month=5;
        if(s.find("Jun")<s.size()) month=6;
        if(s.find("Jul")<s.size()) month=7;
        if(s.find("Aug")<s.size()) month=8;
        if(s.find("Sep")<s.size()) month=9;
        if(s.find("Oct")<s.size()) month=10;
        if(s.find("Nov")<s.size()) month=11;
        if(s.find("Dec")<s.size()) month=12;
        year=stoi(s.substr(s.find_last_of(",")+1,4));
        break;
    }
}
int main()
{
    My_Date d("99/21/1234");
    cout<<d.day<<" "<<d.month<<" "<<d.year<<endl;
    return 0;
}