身份证 15位升级18位 和最后一位校验位计算 

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#include <iostream>
#include <string.h>
using namespace std;
 
char cnid18crc(const char *id18);  // 身份证 最后一位校验位
void cnid_15to18(char *id18 , const char *id15);   // 身份证 15位升级18位
 
int main()
{
    char cnid15[19] = "340524800101001";
    char cnid18[19] ;
    cnid_15to18(cnid18, cnid15);
 
    cout << cnid15 << endl;
    cout << cnid18 << endl;
    return 0;
}
 
// 身份证 最后一位校验位
char cnid18crc(const char *id18)
{
    int sigma = 0;
    int a[]  = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
    char w[] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
 
    for (int i = 0; i < 17; i++) {
        int ai =  id18[i] - '0';
        int wi = a[i];
        cout << ai <<  " * " << wi << "\t= " << (ai * wi) << endl;
        sigma += (ai * wi);
    }
    int number = sigma % 11;
    cout << w[number] << " ---->\t " << sigma << " mod 11 = " << number << endl ;
 
    return w[number];
}
 
// 身份证 15位升级18位
void cnid_15to18(char *id18 , const char *id15)
{
    char *ps = id18 + 2;
    strcpy(ps , id15);
    strncpy(id18 , id15 , 6);
    id18[6] = '1';
    id18[7] = '9';
    id18[17] = 'C';
    id18[18] = '\0';
 
    id18[17] = cnid18crc(id18);
 
}
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3 * 7   = 21
4 * 9   = 36
0 * 10  = 0
5 * 5   = 25
2 * 8   = 16
4 * 4   = 16
1 * 2   = 2
9 * 1   = 9
8 * 6   = 48
0 * 3   = 0
0 * 7   = 0
1 * 9   = 9
0 * 10  = 0
1 * 5   = 5
0 * 8   = 0
0 * 4   = 0
1 * 2   = 2
X ---->  189 mod 11 = 2
340524800101001
34052419800101001X
// 运行结果,加权因子,校验码表
int a[]  = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
char w[] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};