实验

任务4

#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){
    int i;
    printf("ISBN号             书名                       作者              售价     销售册数\n");
    for(i=0;i<n;++i){
        printf("%10s  %-25s %-20s %-10.0lf %d\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;
    Book t;
    for(i = 0; i < n - 1; ++i) {
        for(j = 0; j < n - 1 - i; ++j) {
            if(x[j].sales_count < x[j + 1].sales_count) {
                t = x[j];
                x[j] = x[j + 1];
                x[j + 1] = t;
            }
        }
    }
}

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

任务5

#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2024-12-16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2024-12-16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();
}


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


int day_of_year(Date d) {
   int days_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int day_count = 0;
int i;

    if ((d.year % 4 == 0 && d.year % 100 != 0) || (d.year % 400 == 0)) {
        days_month[1] = 29; 
    }

    for (i = 0; i < d.month - 1; i++) {
        day_count += days_month[i];
    }


    day_count += d.day;

    return day_count;
}

int compare_dates(Date d1, Date d2) {
    if (d1.year != d2.year) {
        return d1.year < d2.year ? -1 : 1;
    }

    if (d1.month != d2.month) {
        return d1.month < d2.month ? -1 : 1;
    }

    if (d1.day != d2.day) {
        return d1.day < d2.day ? -1 : 1;
    }

    return 0; 
}

任务6

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


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);

    return 0;
}


void output(Account x[], int n) {
int i,j;
int a;
char b[N][20]; 
for(i=0;i<n;++i){ 
  printf("%-10s",x[i].username);
a=strlen(x[i].password);
for(j=0;j<a;j++){

    b[i][j]='*';

}
 b[i][a] = '\0'; 
printf("%-10s",b[i]);


      switch (x[i].type) {
            case admin:
                printf("%30s","admin");
                break;
            case student:
                printf("%30s","student");
                break;
            case teacher:
                printf("%30s","teacher");
                break;
            default:
                printf("%30s","unknown");
        }
    
    printf("\n");
  
    
}
}

任务7

#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;

    }
}


void display(Contact x[], int n) {
    int i,j,k;
    Contact a,b;
         
         for (i = 0; i < n - 1; i++) {
        for (j = 0; j < n - 1 - i; j++) {
        
         if (strcmp(x[j].name, x[j + 1].name) > 0){
                a = x[j];
                x[j] = x[j + 1];
                x[j + 1] = a;
            }
   
        }
    }
    
    
       for (i = 0; i < n - 1; i++) {
        for (j = 0; j < n - 1 - i; j++) {
                 if (x[j + 1].vip == 1 && x[j].vip == 0) {
                a = x[j];
                x[j] = x[j + 1];
                x[j + 1] = a;
            }
        
    }
}    

      
    
    for(k=0;k<n;++k){
    printf("%-20s %-20s ",x[k].name,x[k].phone);
           if(x[k].vip){
            printf("%5s", "*");
        printf("\n");
    }
else
printf("\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");
    }
}