身份证号码验证c语言

以下是一个用C语言实现身份证号码验证的例子：

#include <stdio.h>
#include <string.h>

int main()
{
    int N;
    scanf("%d", &N);
    char id[20];
    int weight[17] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
    char check[11] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
    int flag = 1;
    for (int i = 0; i < N; i++) {
        scanf("%s", id);
        int sum = 0;
        for (int j = 0; j < 17; j++) {
            if (id[j] < '0' || id[j] > '9') {
                flag = 0;
                break;
            }
            sum += (id[j] - '0') * weight[j];
        }
        if (!flag) {
            printf("ID number %s is invalid.\n", id);
            flag = 1;
            continue;
        }
        int z = sum % 11;
        if (id[17] != check[z]) {
            printf("ID number %s is invalid.\n", id);
            continue;
        }
        printf("ID number %s is valid.\n", id);
    }
    return 0;
}