用c编写，程序开始时，自动从文件读入信息到结构体数组，并提取每个公民的出生年月放入结构体中，同时进行身份证校验位是否正确，判断信息也放入结构体中。用户选择1时，显示校验位正确的公民信息；用户选择1时，显示校验位正确的公民信息；用户选择2时，显示校验位错误的公民信息，并统计人数。用户选择2时，显示校验位错误的公民信息，并统计人数。用户选择3时，将正确公民信息按出生日期排序并输出。 若用户选择0，会退出程序，但在此之前，会自动将身份证号码正确的数据写入文件person_checked.txt中。补全主函数，#include <stdio.h> #include <string.h> #define N 100 struct birth { int year; int month; int day; }; struct person { char ID[19]; char name[20]; struct birth birthday; int flag;//校验位是否正确, 1代表正确，0代表错误 }; int read(struct person p[]); int checkID(char *ID); struct birth get_birth(char *ID); void get_all_person(struct person p[], int n); void display_person(struct person p[], int n, int flag); int birth_cmp(struct birth birth1, struct birth birth2); void birth_sort(struct person p[], int n); int search(struct person p[], int n, char *name); void save(struct person p[], int n); int prompt(void); int main(void) { struct person p[N]; int cmd, n; while (1) { cmd = prompt(); } return 0; }

补全代码如下：

#include <stdio.h>
#include <string.h>
#define N 100

struct birth {
    int year;
    int month;
    int day;
};

struct person {
    char ID[19];
    char name[20];
    struct birth birthday;
    int flag;//校验位是否正确, 1代表正确，0代表错误
};

int read(struct person p[]);
int checkID(char *ID);
struct birth get_birth(char *ID);
void get_all_person(struct person p[], int n);
void display_person(struct person p[], int n, int flag);
int birth_cmp(struct birth birth1, struct birth birth2);
void birth_sort(struct person p[], int n);
int search(struct person p[], int n, char *name);
void save(struct person p[], int n);
int prompt(void);

int main(void) {
    struct person p[N];
    int cmd, n;

    n = read(p);

    while (1) {
        cmd = prompt();
        switch (cmd) {
        case 0:
            save(p, n);
            return 0;
        case 1:
            get_all_person(p, n);
            display_person(p, n, 1);
            break;
        case 2:
            get_all_person(p, n);
            display_person(p, n, 0);
            break;
        case 3:
            get_all_person(p, n);
            birth_sort(p, n);
            display_person(p, n, 1);
            break;
        default:
            printf("Invalid command\n");
        }
    }

    return 0;
}

int read(struct person p[]) {
    FILE *fp;
    char filename[100];
    int i = 0;

    printf("Enter the filename: ");
    scanf("%s", filename);

    fp = fopen(filename, "r");
    if (fp == NULL) {
        printf("Failed to open file %s\n", filename);
        return 0;
    }

    while (fscanf(fp, "%s %s", p[i].ID, p[i].name) == 2) {
        if (checkID(p[i].ID)) {
            p[i].flag = 1;
            p[i].birthday = get_birth(p[i].ID);
            i++;
        }
        else {
            p[i].flag = 0;
        }
    }

    fclose(fp);

    return i;
}

int checkID(char *ID) {
    int i, sum = 0;
    int weight[18] = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };
    char check[11] = "10X98765432";

    for (i = 0; i < 17; i++) {
        if (ID[i] < '0' || ID[i] > '9') {
            return 0;
        }
        sum += (ID[i] - '0') * weight[i];
    }

    if (ID[17] == check[sum % 11]) {
        return 1;
    }

    return 0;
}

struct birth get_birth(char *ID) {
    struct birth birth;

    birth.year = (ID[6] - '0') * 1000 + (ID[7] - '0') * 100 + (ID[8] - '0') * 10 + (ID[9] - '0');
    birth.month = (ID[10] - '0') * 10 + (ID[11] - '0');
    birth.day = (ID[12] - '0') * 10 + (ID[13] - '0');

    return birth;
}

void get_all_person(struct person p[], int n) {
    int i;

    for (i = 0; i < n; i++) {
        if (p[i].flag == 0) {
            p[i].birthday.year = 0;
            p[i].birthday.month = 0;
            p[i].birthday.day = 0;
        }
        else {
            p[i].birthday = get_birth(p[i].ID);
        }
    }
}

void display_person(struct person p[], int n, int flag) {
    int i, count = 0;

    printf("ID\t\t\tName\t\t\tBirthday\n");

    for (i = 0; i < n; i++) {
        if (p[i].flag == flag) {
            count++;
            printf("%s\t%s\t%d-%02d-%02d\n", p[i].ID, p[i].name, p[i].birthday.year, p[i].birthday.month, p[i].birthday.day);
        }
    }

    if (count == 0) {
        printf("No data found\n");
    }
    else {
        printf("Total: %d\n", count);
    }
}

int birth_cmp(struct birth birth1, struct birth birth2) {
    if (birth1.year != birth2.year) {
        return birth1.year - birth2.year;
    }
    else if (birth1.month != birth2.month) {
        return birth1.month - birth2.month;
    }
    else {
        return birth1.day - birth2.day;
    }
}

void birth_sort(struct person p[], int n) {
    int i, j;
    struct person tmp;

    for (i = 0; i < n - 1; i++) {
        for (j = i + 1; j < n; j++) {
            if (birth_cmp(p[i].birthday, p[j].birthday) > 0) {
                tmp = p[i];
                p[i] = p[j];
                p[j] = tmp;
            }
        }
    }
}

int search(struct person p[], int n, char *name) {
    int i;

    for (i = 0; i < n; i++) {
        if (strcmp(p[i].name, name) == 0) {
            return i;
        }
    }

    return -1;
}

void save(struct person p[], int n) {
    FILE *fp;
    int i;

    fp = fopen("person_checked.txt", "w");
    if (fp == NULL) {
        printf("Failed to open file person_checked.txt\n");
        return;
    }

    for (i = 0; i < n; i++) {
        if (p[i].flag == 1) {
            fprintf(fp, "%s %s\n", p[i].ID, p[i].name);
        }
    }

    fclose(fp);
}

int prompt(void) {
    int cmd;

    printf("\n");
    printf("0. Exit\n");
    printf("1. Show all valid persons\n");
    printf("2. Show all invalid persons\n");
    printf("3. Sort persons by birth date\n");
    printf("Enter command: ");
    scanf("%d", &cmd);

    return cmd;
}