129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
#include<stdio.h>
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#include<stdlib.h>
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int delete_menu()
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{
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printf("------------删除------------\n\n"); //打印删除菜单并返回用户的选择值
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printf("0 - 返回.\n");
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printf("1 - 按姓名查找.\n");
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printf("2 - 按电话查找.\n");
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printf("3 - 按E-mail查找.\n");
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char c[10];
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do
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{
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printf("\nChoice:");
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gets(c);
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} while (strlen(c)!=1||strchr(CHOICES, c[0])==NULL);
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printf("\n");
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return c[0] - '0';
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}
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int confirm() //提示是否确认删除操作
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{
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char s[10];
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printf("确认删除?(Y/N) ");
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gets(s);
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if(strcmp(s,"Y")&&strcmp(s,"y"))
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{
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printf("\n取消删除.\n");
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return 0;
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}
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else return 1;
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}
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struct Contact* delete_by_name(char name[],struct Contact* head) //传入链表的头指针，删除name成员名与传入的字符串相同的结构体
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{
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while(head!=NULL)
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{
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if(head->next==NULL)break;
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if(strcmp((head->next)->name,name)==0)return head;
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head=head->next;
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}
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printf("内容不存在.\n\n");
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return NULL;
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}
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struct Contact* delete_by_tel(char tel[],struct Contact* head) ////传入链表的头指针，删除tel成员名与传入的字符串相同的结构体
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{
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while(head!=NULL)
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{
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if(head->next==NULL)break;
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if(strcmp((head->next)->tel,tel)==0)return head;
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head=head->next;
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}
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printf("内容不存在.\n\n");
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return NULL;
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}
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struct Contact* delete_by_email(char email[],struct Contact* head) //传入链表的头指针，删除email成员名与传入的字符串相同的结构体
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{
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while(head!=NULL)
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{
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if(head->next==NULL)break;
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if(strcmp((head->next)->email,email)==0)return head;
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head=head->next;
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}
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printf("内容不存在.\n\n");
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return NULL;
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}
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struct Contact* deletec(struct Contact *head) //调用以上三个函数实现删除
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{
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int c;
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char s[30];
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c=delete_menu();
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if (c == 0)return NULL;
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else if (c == 1)
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{
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printf("请输入姓名: ");
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gets(s);
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if(strcmp(s,head->name)!=0)return delete_by_name(s,head);
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showc(head);
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if(!confirm())return NULL;
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head=head->next;
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writec(head,"wb");
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printf("删除成功!\n\n");
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return NULL;
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}
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else if (c == 2)
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{
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printf("请输入电话: ");
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gets(s);
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if(strcmp(s,head->tel)!=0)return delete_by_tel(s,head);
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showc(head);
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if(!confirm())return NULL;
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head=head->next;
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writec(head,"wb");
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printf("删除成功!\n\n");
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return NULL;
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}
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else if (c == 3)
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{
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printf("请输入E-mail: ");
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gets(s);
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if(strcmp(s,head->email)!=0)return delete_by_email(s,head);
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showc(head);
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if(!confirm())return NULL;
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head=head->next;
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writec(head,"wb");
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printf("删除成功！\n\n");
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return NULL;
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}
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}
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void removec() //将菜单界面与删除操作结合
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{
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struct Contact *head,*p1,*p2;
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head=copyc();
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p1=deletec(head);
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if(p1==NULL)return;
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showc(p1->next);
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if(!confirm())return;
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p2=p1->next;
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(p1->next)=(p2->next);
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writec(head,"wb");
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printf("删除成功！\n\n");
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}
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