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| #include<iostream>
#include<cstring>
#include<stdio.h>
#include<stdlib.h>
using namespace std;
class book
{
public:
int num;
float price;
book *next;
};
book *head = NULL;
bool check(string str)
{
for (int i = 0; i < (int)str.length(); i++)
{
if ((str[i] > '9' || str[i] < '0') && (str[i] != '.'))
return false;
}
return true;
}
book* create()
{
book *p1, *p2;
p1 = new book;
head = p1;
p2 = p1;
cout << "请输入图书的编号，以0结束" << endl;
string str;
cin >> str;
while (!check(str)) {
cout << "输入的不是数字，请重新输入，按0返回" << endl;
cin >> str;
}
p1->num = atoi(str.c_str());
//cin>>p1->num;
if (p1->num != 0) {
cout << "请输入图书的价格" << endl;
cin >> str;
while (!check(str)) {
cout << "输入的不是数字，请重新输入，按0返回" << endl;
cin >> str;
}
p1->price = atof(str.c_str());
//cin>>p1->price;
} else {
delete p1;
p2 = NULL;
p2->next = NULL;
head = NULL;
return head;
}
while (p1->num != 0) {
p2 = p1;
p1=new book;
cout << "请输入图书的编号，以0结束" << endl;
cin >> str;
while (!check(str)) {
cout << "输入的不是数字，请重新输入，按0返回" << endl;
cin >> str;
}
p1->num = atoi(str.c_str());
//cin >> p1->num;
if (p1->num != 0) {
cout << "请输入图书的价格" << endl;
cin >> str;
while (!check(str)) {
cout << "输入的不是数字，请重新输入，按0返回" << endl;
cin >> str;
}
p1->price = atof(str.c_str());
//cin >> p1->price;
}
p2->next = p1;
}
delete p1;
p2->next = NULL;
return head;
}
void showbook(book *head)
{
cout<<endl;
cout<<"图书信息如下："<<endl;
while(head)
{
cout<<"图书编号："<<head->num<<"\t"<<"图书价格："<<head->price<<endl;
head=head->next;
}
}
void Delete(book *head,int num)
{
book *l;
if(head->num==num){
l=head;
head=head->next;
::head=head;
delete l;
cout<<"操作成功"<<endl;
return ;
}
while(head)
{
if(head->next==NULL)
{
cout<<"找不到要删除的编号。"<<endl;
return ;
}
if(head->next->num==num)
{
l=head->next;
head->next=l->next;
delete l;
cout<<"操作成功"<<endl;
return ;
}
head=head->next;
}
cout<<"找不到要删除的编号。"<<endl;
}
void insert(book *head,int num,float price)
{
book *list=new book;
list->num=num;
list->price=price;
list->next=head;
::head=list;
}
int main()
{
head=create();
showbook(head);
cout<<"请输入你要删除的图书编号：";
int BookNum;
cin>>BookNum;
Delete(head,BookNum);
showbook(head);
cout<<"请输入您要插入的图书编号：";
cin>>BookNum;
cout<<"请输入您要插入的图书价格：";
float BookPrice;
cin>>BookPrice;
insert(head,BookNum,BookPrice);
showbook(head);
return 0;
}
|