輸入
公民身份號碼的本體碼（master number），身份證前17位數字，6位數字地址碼 + 8位數字出生日期碼 + 3位數字順序碼
輸出
公民身份號碼的校驗碼（check number），身份證第18位（最後一位）數字，用來驗證本體碼的錄入或轉錄過程準確性的號碼，1位數字校驗碼
C++實現代碼
#include <iostream>
int main()
{
uint64_t inID = 0;
std::cout << "Enter the master number of the citizen ID: ";
std::cin >> inID;
if (11000000000101000 <= inID && inID <= 82999999991231999) {
const int w[17] = { 2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10, 9, 7 };
int s = 0;
uint64_t id = inID;
for (int i = 0; i < 17; ++i) {
s += (id % 10) * w[i];
id /= 10;
}
const char cn[11] = { '1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2' };
std::cout << std::endl << "The citizen ID check number is: " << cn[s % 11] << std::endl;
return 0;
}
std::cerr << std::endl
<< "The master number is incorrect." << std::endl
<< "It must have 17 digits (address code + YYYYMMDD + seq, 6+8+3)." << std::endl;
return 1;
}