实验6

实验任务4

代码：

#include <stdio.h>
#include <stdlib.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));
    
    system("pause");
    return 0;
}  
void output(Book x[], int n){
    int i;
    printf("%-18s %-25s %-18s %-6s %-6s\n","ISBN号","书名","作者","售价","销售册数");
    for(i = 0;i < n;i++){
    printf("%-18s %-25s %-18s %-6g %-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,j;
    for(i = 0;i < n - 1;i++){
        for(j = 0;j < n - 1;j++){
            if(x[j].sales_count < x[j + 1].sales_count){
                Book temp = x[j];
                x[j] = x[j + 1];
                x[j + 1] = temp;
            }
        }
    }
}
double sales_amount(Book x[], int n){
    int i;
    double total = 0.0;
    for(i = 0;i < n;i++){
        total += x[i].sales_price * x[i].sales_count;
    }
    return total;
}

 

截图：

 

 

实验任务5

代码：

#include <stdio.h>
#include <stdlib.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();

    system("pause");
    return 0;
}

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

int day_of_year(Date d) {
    int i;
    int month_day[12] = {0,31,28,31,30,31,30,31,31,30,31,30};
    int total = 0;

    for(i = 1;i < d.month;i++){
        total += month_day[i];
    }
    total += d.day;

    if((d.year % 4 == 0 && d.year % 100 != 0) || (d.year % 400 == 0)){
        if(d.month > 2){
            total += 1;
        }
    }
    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;
}

 

截图：

 

 

实验任务6

代码：

#include <stdio.h>
#include <stdlib.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;
    n = sizeof(x)/sizeof(Account);
    output(x, n);

    system("pause");
    return 0;
}

void output(Account x[], int n) {
    int i,j;
    int pwd_len;
    for(i = 0;i < n;i++){
        printf("%-10s",x[i].username);
        pwd_len = strlen(x[i].password);
        for(j = 0;j < pwd_len;j++){
            printf("*");
        }
        printf("%*s",12 - pwd_len,"");
        switch(x[i].type){
        case admin:
            printf("admin");
            break;
        case student:
            printf("student");
            break;
        case teacher:
            printf("teacher");
            break;
        }
        printf("\n");
    }
}

 

截图：

 

 

实验任务7

代码：

#include <stdio.h>
#include <stdlib.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);

    system("pause");
    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 display(Contact x[], int n) {
    int i,j;
    Contact temp;
    
    for(i = 0;i < n - 1;i++){
        for(j = 0;j < n - 1 - i;j++){
            if(x[j].vip < x[j + 1].vip){
                temp = x[j];
                x[j] = x[j + 1];
                x[j + 1] = temp;
            }
            else if(x[j].vip == x[j + 1].vip){
                if(strcmp(x[j].name,x[j + 1].name) > 0){
                    temp = x[j];
                    x[j] = x[j + 1];
                    x[j + 1] = temp;
                }
            }
        }
    }
    output(x,n);
}

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");
    }
}

 

截图：