sale.cpp

C++语言课程设计- 图书管理系统 我个人在大一时做的 不足之处还请赐教

//*******************************
//		前台销售模块
//*******************************
#include<iostream.h>
#include<iomanip.h>
#include<fstream.h>
#include<stdlib.h>
#include<windows.h>
#include<time.h>
//#include"book.h"
#include"booksale.h"

int match(char *);
void showtime();

void sale()
{
	book p;
	booksale bs[50];		//假设客户一次最多买书的种类不超过50
//	int species=0;			//用于记录书库中实际书的种类数 
	int i=0,flag=-1;
	int n=0;				//购买一本书的数量
	int size=0;				//记录客户实际购买书的种类数

	char cname[51],ch='0',again='0';
	
	fstream file("book.dat",ios::in|ios::out|ios::binary);
	if(!file)
	{
		cout<<"\n\n\t打开文件失败!"<<endl;
		exit(1);
	}
	
	do
	{
		system("cls");
		cout<<"\n\n\n\t请输入你要购买数的书名：";
		cin>>cname;
		cin.ignore();
		cout<<endl;
		flag=match(cname);		
	
		if(flag==0)
		{
			cout<<"查无此书！"<<endl;
			system("pause");
		}
		else
		{	
			file.seekg(0l,ios::beg);
			while(!file.eof())
			{
				file.read((char*)&p,sizeof(p));
				if(strcmp(cname,p.getbookname())==0)
					break;
			}
			cout<<"你要的书的信息如下:"<<endl;
			cout<<p;
		
			cout<<endl<<"请输入要买书的数量：";
			cin>>n;
			if(n>p.getvolumn())
			{
				cout<<"\n对不起,你要的数量已超过该书的库存量"<<p.getvolumn()<<endl;
			}
			if(n<=p.getvolumn())
			{
				bs[i].setbookname(p.getbookname());
				bs[i].setisbn(p.getisbn());
				bs[i].setnum(n);
				bs[i].setretail(p.getretail());
				i++;
			}
		}
		cout<<"\n继续购买其他书请按y键"<<endl;
		cout<<"\n按其他任意键结束本次购买！"<<endl;
		cout<<"\n请输入:";
		cin>>again;
		cin.ignore();
	}while(again=='y');

	file.close();
	size=i;

	if(i==0)
	{
		
		cout<<"\t\t谢谢光临!欢迎下次再来!"<<endl;
		system("pause");
		return;
	}
	if(again!='y'&&i>0&&size<=50)
	{	
		system("cls");
		
		cout<<"\n\n\t\t\t前台销售模块"<<endl<<endl;
		showtime();
		cout<<"--------------------------------------------------------------------------------";
		for(i=0;i<size;i++)
		{
			cout<<setw(8)<<"数 量"
				<<setw(13)<<"ISBN号"
				<<setw(20)<<"书   名"
				<<setw(15)<<"单 价"
				<<setw(15)<<"金  额"<<endl;
			cout<<setw(8)<<bs[i].getnum()
				<<setw(13)<<bs[i].getisbn()
				<<setw(20)<<bs[i].getbookname()
				<<setiosflags(ios::fixed)
				<<setprecision(2)
				<<setw(15)<<bs[i].getretail()
				<<setw(15)<<bs[i].getretail()*bs[i].getnum()<<endl;
			bs[i].setaccount(bs[i].getretail()*bs[i].getnum());
		}
		cout<<"--------------------------------------------------------------------------------"<<endl;
		
		cout<<"\t\t销售合计:"<<"  ￥"<<bs[0].getaccount()<<"元"<<endl;
		cout<<"\t\t零售税  :"<<"  ￥"<<bs[0].getaccount()*bs[0].getrate()<<"元"<<endl;
		cout<<"\t\t应付总额:"<<"  ￥"<<bs[0].getaccount()*(1+bs[0].getrate())<<"元"<<endl;
		cout<<"--------------------------------------------------------------------------------";
		cout<<"\n\n\t\t\t谢谢光临!"<<endl<<endl<<endl;
		system("pause");

// 创建销售日志
		struct tm *times;
		time_t t;
		t=time(0);
		times=localtime(&t);
		
		fstream outf("salelog.txt",ios::out|ios::app);
		if(!outf)
		{
			cout<<" 创建销售日志失败!"<<endl;
			system("pause");
		}
		outf<<"--------------------------------------------------------------------------------"<<endl;
//把时间写入销售日志里
		outf<<(times->tm_year+1900)<<"年"
			<<(times->tm_mon+1)<<"月"
			<<times->tm_mday<<"日"<<endl<<endl;
		for(i=0;i<size;i++)
		{
			outf<<i+1<<". "
				<<"  书 名 :"<<bs[i].getbookname()
				<<"  ISBN号 :"<<bs[i].getisbn()
				<<"  单 价 :"<<bs[i].getretail()<<"元"
				<<"  数 量 :"<<bs[i].getnum()<<"本"
				<<"  金 额 :"<<bs[i].getretail()*bs[i].getnum()<<"元"<<endl;
		}
		outf<<endl;
		outf<<"销售合计:"<<bs[0].getaccount()<<"元"<<endl
			<<"零售税  :"<<bs[0].getaccount()*bs[0].getrate()<<"元"<<endl
			<<"销售总额:"<<bs[0].getaccount()*(1+bs[0].getrate())<<"元"<<endl;
		outf<<"--------------------------------------------------------------------------------"<<endl;
		outf.close();
//在book.dat保存销售后的信息
		file.open("book.dat",ios::in|ios::out|ios::binary);
		if(!file)
		{
			cout<<"书库数据更新失败!"<<endl;
			system("pause");
			exit(1);
		}
		for(i=0;(i<size)&&(!file.eof());i++)
		{
			file.read((char*)&p,sizeof(p));
			if(strcmp(bs[i].getbookname(),p.getbookname())==0)
			{
				p.setvolumn(p.getvolumn()-bs[i].getnum());
				file.seekp(-(long)sizeof(p),ios::cur);
				file.write((char*)&p,sizeof(p));
			}
		}
		file.close();
	}
}