C语言第二次课程设计

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LEN sizeof(struct book)
struct book{
    char name[20];
    int status;
    char author[20];
    struct book* next;
};
struct book *head=NULL,*p1,*p2;
char c[2][10]={"可借","已借出"};
void print(){
    printf("=======欢迎来到至诚书库管理系统=======\n");
    printf("        请输入您的需求：\n");
    printf("        1.添加书籍\n");
    printf("        2.查看书籍\n");
    printf("        3.删除书籍\n"); 
    printf("        4.借出书籍\n"); 
    printf("        5.归还书籍\n"); 
    printf("        0.退出程序\n"); 
    printf("======================================\n");
}
void add(){
    if (head==NULL) head=p1;
    else 
        p2->next=p1;
        p2=p1;
    
    if (head!=NULL) p2->next=NULL;
    printf("请输入书籍名字：");
    scanf("%s",p1->name);
    printf("请输入作者名字：");
    scanf("%s",p1->author);
    p1->status=0;
    p1=(struct book *)malloc(LEN);
    printf("成功添加《%s》到书库\n",p2->name);
}
void check() {
    int n,f=0;
    char a[20],x[3]="《",y[3]="》";
    struct book *p=head;
    printf("请输入查找方式：\n");
    printf("1.按书名查找\n");
    printf("2.按作者查找\n");
    printf("3.查看所有书籍\n");
    scanf("%d",&n);
    if (n==1) {
        printf("请输入书名：");
        scanf("%s",a);
        while (strcmp(p->name,a)!=0&&p->next!=NULL) p=p->next;
        if (strcmp(p->name,a)==0) {
            printf("%-20s%-20s%-20s\n","书名","作者","状态");
            printf("%-20s%-20s%-20s\n",strcat(strcat(x,p->name),y),p->author,c[p->status]);
            f=1;
        }
        if (f==0) printf("查无此书！");
    }
    if (n==2) {
        printf("请输入作者名：");
        scanf("%s",a);
        printf("%-20s%-20s%-20s\n","书名","作者","状态");
        while (p!=NULL) {
            if (strcmp(p->author,a)==0) {
                strcpy(x,"《");
                printf("%-20s%-20s%-20s\n",strcat(strcat(x,p->name),y),p->author,c[p->status]);
                f=1;
            }
            p=p->next;
        }
        if (f==0) printf("查无此书！"); 
    }
    if (n==3) {
        printf("%-20s%-20s%-20s\n","书名","作者","状态");
        while (p!=NULL) {
            strcpy(x,"《");
            printf("%-20s%-20s%-20s\n",strcat(strcat(x,p->name),y),p->author,c[p->status]);
            p=p->next;
            }
    }
}
void del() {
    int f=0;
    struct book *p=head;
    char a[20];
    printf("请输入您要删除的书籍：");
    scanf("%s",a);
    while(p!=NULL) {
        if (strcmp(head->name,a)==0) {
            head=head->next;
            f=1;
            break;
        }
        else if(strcmp(p->next->name,a)==0) {
                 p->next=p->next->next;
                 f=1;
                 break;
            }
            if (p!=NULL) p=p->next;
            else break;
        }
    if (f==1) printf("删除成功！");
    if (f==0) printf("删除失败，没有该书！");
}
void borrow() {
    struct book *p=head;
    char a[20];
    printf("请输入您要借的书籍：");
    scanf("%s",a);
    while (strcmp(p->name,a)!=0&&p->next!=NULL) p=p->next;
    if (strcmp(p->name,a)==0&&p->status==0) {
        printf("《%s》借书成功！",p->name);
        p->status=1;
    }
    else printf("借书失败！");
}
void revert() {
    int f=0; 
    struct book *p=head;
    char a[20];
    printf("请输入您要归还的书籍：");
    scanf("%s",a);
    while (strcmp(p->name,a)!=0&&p->next!=NULL) p=p->next;
    if (strcmp(p->name,a)==0) {
        if (p->status==1) {
        printf("还书成功！");
        p->status=0;
        f=1;
    }
    }
    if (f==0) printf("还书失败！无需归还此书。");
}
void tips() {
    printf("输入回车返回\n");
    getchar();
    getchar();
    return;
}
void addbook(char a[20],int n,char b[20]) {
    if (head==NULL) head=p1;
    else {
        p2->next=p1;
        p2=p1;
    }
    if (head!=NULL) p2->next=NULL;
    strcpy(p1->name,a);
    strcpy(p1->author,b);
    p1->status=n;
    p1=(struct book *)malloc(LEN);
}
int main(void)
{
    p1=p2=(struct book *)malloc(LEN);
    addbook("活着",1,"余华");
    addbook("龙族",0,"江南");
    addbook("许三观卖血记",0,"余华");
    addbook("1984",0,"乔治-奥威尔");
    while (1) {
        print(); 
        int op;
        printf("请选择：");
        scanf("%d",&op);
        switch (op) {
            case 1: printf("-->添加书籍\n");add(); break;
            case 0:printf("程序退出\n");return 0;
            case 2: printf("-->查看书籍\n");check(); break;
            case 3: printf("-->删除书籍\n");del(); break;
            case 4: printf("-->借出书籍\n");borrow(); break;
            case 5: printf("-->归还书籍\n");revert(); break;
            default: printf("请正确输入！");
        }
        tips();
        system("cls");
    }
    return 0;
}