实验六

实验四

#include <stdio.h>
#define N 10

typedef struct {
    char isbn[20];
    char name[80];
    char author[80];
    double sales_price;
    int sales_count;
} Book;

void output(Book x[], int n);
void sort(Book x[], int n);
double sales_amount(Book x[], int n);

int main() {
    Book x[N] = {
        {"978-7-5327-6082-4", "门将之死", "罗纳德.伦", 42, 51},
        {"978-7-308-17047-5", "自由与爱之地：入以色列记", "云也退", 49, 30},
        {"978-7-5404-9344-8", "伦敦人", "克莱格泰勒", 68, 27},
        {"978-7-5447-5246-6", "软件体的生命周期", "特德姜", 35, 90},
        {"978-7-5722-5475-8", "芯片简史", "汪波", 74.9, 49},
        {"978-7-5133-5750-0", "主机战争", "布莱克.J.哈里斯", 128, 42},
        {"978-7-2011-4617-1", "世界尽头的咖啡馆", "约翰·史崔勒基", 22.5, 44},
        {"978-7-5133-5109-6", "你好外星人", "英国未来出版集团", 118, 42},
        {"978-7-1155-0509-5", "无穷的开始:世界进步的本源", "戴维·多伊奇", 37.5, 55},
        {"978-7-229-14156-1", "源泉", "安.兰德", 84, 59}
    };
    printf("图书销量排名(按销售册数): \n");
    sort(x, N);
    output(x, N);
    printf("\n图书销售总额: %.2f\n", sales_amount(x, N));
    return 0;
}

void output(Book x[], int n) {
    printf("%-20s %-30s %-20s %-6s %s\n", "ISBN号", "书名", "作者", "售价", "销售册数");
    int i;
    for (i = 0; i < n; i++) {
        if (x[i].sales_price == (int)x[i].sales_price)
            printf("%-20s %-30s %-20s %6d %6d\n",
                   x[i].isbn, x[i].name, x[i].author, (int)x[i].sales_price, x[i].sales_count);
        else
            printf("%-20s %-30s %-20s %6.1f %6d\n",
                   x[i].isbn, x[i].name, x[i].author, x[i].sales_price, x[i].sales_count);
    }
}

void sort(Book x[], int n) {
    int i;
    for (i = 0; i < n - 1; i++) {
        int max_idx = i;
        int j;
        for (j = i + 1; j < n; j++) {
            if (x[j].sales_count > x[max_idx].sales_count)
                max_idx = j;
        }
        if (max_idx != i) {
            Book temp = x[i];
            x[i] = x[max_idx];
            x[max_idx] = temp;
        }
    }
}

double sales_amount(Book x[], int n) {
    double total = 0.0;
    int i;
    for (i = 0; i < n; i++) {
        total += x[i].sales_price * x[i].sales_count;
    }
    return total;
}

 实验五

#include <stdio.h>

typedef struct {
    int year;
    int month;
    int day;
} Date;

void input(Date *pd);
int day_of_year(Date d);
int compare_dates(Date d1, Date d2);

void test1() {
    Date d;
    int i;
    printf("输入日期：（以形如2025-12-19这样的形式输入）\n");
    for(i = 0; i < 3; ++i) {
        input(&d);
        printf("%d-%02d-%02d是这一年中第%d天\n\n", d.year, d.month, d.day, day_of_year(d));
    }
}

void test2() {
    Date Alice_birth, Bob_birth;
    int i;
    int ans;
    printf("输入Alice和Bob出生日期：（以形如2025-12-19这样的形式输入）\n");
    for(i = 0; i < 3; ++i) {
        input(&Alice_birth);
        input(&Bob_birth);
        ans = compare_dates(Alice_birth, Bob_birth);
        if(ans == 0)
            printf("Alice和Bob一样大\n\n");
        else if(ans == -1)
            printf("Alice比Bob大\n\n");
        else
            printf("Alice比Bob小\n\n");
    }
}

int main() {
    printf("测试1: 输入日期, 打印输出这是一年中第多少天\n");
    test1();
    printf("\n测试2: 两个人年龄大小关系\n");
    test2();
    return 0;
}

void input(Date *pd) {
    scanf("%d-%d-%d", &pd->year, &pd->month, &pd->day);
}

int day_of_year(Date d) {
    int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    if ((d.year % 4 == 0 && d.year % 100 != 0) || (d.year % 400 == 0))
        days_in_month[1] = 29;
    int i;
    int total = 0;
    for (i = 0; i < d.month - 1; i++)
        total += days_in_month[i];
    total += d.day;
    return total;
}

int compare_dates(Date d1, Date d2) {
    if (d1.year < d2.year) return -1;
    if (d1.year > d2.year) return 1;
    if (d1.month < d2.month) return -1;
    if (d1.month > d2.month) return 1;
    if (d1.day < d2.day) return -1;
    if (d1.day > d2.day) return 1;
    return 0;
}

实验六

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

enum Role { admin, student, teacher };

typedef struct {
    char username[20];
    char password[20];
    enum Role type;
} Account;

void output(Account x[], int n);

int main() {
    Account x[] = {
        {"A1001", "123456", student},
        {"A1002", "123abcdef", student},
        {"A1009", "xyz12121", student},
        {"X1009", "9213071x", admin},
        {"C11553", "129dfg32k", teacher},
        {"X3005", "921kfmg917", student}
    };
    int n = sizeof(x) / sizeof(Account);
    output(x, n);
    return 0;
}

void output(Account x[], int n) {
    int i;
    int a=13;
    for (i = 0; i < n; i++) {
        printf("%-10s ", x[i].username);
        int len = strlen(x[i].password);
        int j;
        for (j = 0; j < len; j++) {
            printf("*");
        }
        for (j=0;j<a-len;j++)
        printf(" ");
        switch (x[i].type) {
            case admin:   printf("admin\n"); break;
            case student: printf("student\n"); break;
            case teacher: printf("teacher\n"); break;
        }
    }
}

 实验七

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

typedef struct {
    char name[20];
    char phone[12];
    int vip;
} Contact;

void set_vip_contact(Contact x[], int n, char name[]);
void output(Contact x[], int n);
void display(Contact x[], int n);

#define N 10

int main() {
    Contact list[N] = {
        {"刘一", "15510846604", 0},
        {"陈二", "18038747351", 0},
        {"张三", "18853253914", 0},
        {"李四", "13230584477", 0},
        {"王五", "15547571923", 0},
        {"赵六", "18856659351", 0},
        {"周七", "17705843215", 0},
        {"孙八", "15552933732", 0},
        {"吴九", "18077702405", 0},
        {"郑十", "18820725036", 0}
    };
    int vip_cnt, i;
    char name[20];
    printf("显示原始通讯录信息:\n");
    output(list, N);
    printf("\n输入要设置的紧急联系人个数: ");
    scanf("%d", &vip_cnt);
    printf("输入%d个紧急联系人姓名:\n", vip_cnt);
    for(i = 0; i < vip_cnt; ++i) {
        scanf("%s", name);
        set_vip_contact(list, N, name);
    }
    printf("\n显示通讯录列表:(按姓名字典序升序排列,紧急联系人最先显示)\n");
    display(list, N);
    return 0;
}

void set_vip_contact(Contact x[], int n, char name[]) {
    int i;
    for (i = 0; i < n; ++i) {
        if (strcmp(x[i].name, name) == 0) {
            x[i].vip = 1;
            break;
        }
    }
}

void output(Contact x[], int n) {
    int i;
    for (i = 0; i < n; ++i) {
        printf("%-10s%-15s", x[i].name, x[i].phone);
        if (x[i].vip)
            printf("%5s", "*");
        printf("\n");
    }
}

void display(Contact x[], int n) {
    Contact temp[N];
    int i;
    for (i = 0; i < n; ++i)
        temp[i] = x[i];
    for (i = 0; i < n - 1; ++i) {
        int j;
        for (j = 0; j < n - i - 1; ++j) {
            if (temp[j].vip < temp[j+1].vip) {
                Contact t = temp[j];
                temp[j] = temp[j+1];
                temp[j+1] = t;
            } else if (temp[j].vip == temp[j+1].vip) {
                if (strcmp(temp[j].name, temp[j+1].name) > 0) {
                    Contact t = temp[j];
                    temp[j] = temp[j+1];
                    temp[j+1] = t;
                }
            }
        }
    }
    for (i = 0; i < n; ++i) {
        printf("%-10s%-15s", temp[i].name, temp[i].phone);
        if (temp[i].vip)
            printf("%5s", "*");
        printf("\n");
    }
}