判斷字串<身分證>

#include "stdafx.h"
#include <iostream>
#include <string>
#include <cctype>
using namespace std;

bool checkID(string idStr)
{
	int letterNums[] = { 10, 11, 12, 13, 14, 15, 16, 17, 34, 18, 19, 20, 21, 22, 35, 23, 24, 25, 26, 27, 28, 29, 32, 30, 31, 33 };
	if (islower(idStr[0]))
		idStr[0] = toupper(idStr[0]);

	int total = (letterNums[idStr[0] - 'A'] / 10) + (letterNums[idStr[0] - 'A'] % 10) * 9;
	for (int i = 1; i < 9; i++)
		total += (idStr[i] - '0')*(9 - i);

	int checkNum = (10 - total % 10) % 10;
	if (checkNum == (idStr[9] - '0'))
		return true;
	else
		return false;
}


int main()
{
	string s, t = "01234546789";
	int i;
	for (i = 0; i < 3; i++)
	{
		cout << "請輸入身分證字號" << endl;
		cin >> s;

		if (s.size() != 10)
		{
			cout << "不正確，請重新輸入" << endl;
		}
		else
		{
			cout << "總共10字元，正確" << endl;
			break;
		}
	}
	if (i == 3)
		cout << "錯誤達三次，請稍後再試" << endl;
	while (i < 3)
	{
		unsigned int j, count = 0, pos = 1;
		while ((j = s.find_first_of(t, pos)) != string::npos)
		{
			count++;
			pos = pos + 1;
		}
		cout << "在" << s << "中";
		if (count == 0)
		{
			cout << "沒有數字字元" << endl;
			i = 4;
		}
		else
		{
			cout << "有" << count << "個數字字元" << endl;
			i = 4;
		}
	}

	if (checkID(s) == 1)
		cout << "此身分證字號為合法的身分證字號" << endl;
	else
		cout << "此身分證不合法" << endl;
}