bookdeal.cpp

来自「纯C语言的图书管理系统」· C++ 代码 · 共 67 行

#include "stdafx.h"
#include "BookDeal.h"
#include <string.h>

void BorrowBook(BookRecType **head)
{
	char bno[5];
	BookRecType * CurrP=NULL/*指向当前节点的指针*/;
	bool bFindBookFlag=false;
	if (*head == NULL) printf("请先选择1-->2 从文件中读取数据\n");
	do 
	{	
		printf("请输入书号bno=");
		scanf("%s",bno);
		for (CurrP = *head ; CurrP!=NULL; CurrP = CurrP->next)
		{
			if (strcmp(bno,CurrP->bno)==0)
			{
				bFindBookFlag=true;
				if (CurrP->storenum >0)
				{
					CurrP->storenum --;
					CurrP->borrownum ++;
					printf("《%s》(书号%s)已成功借阅!\n",CurrP->bname,CurrP->bno);
				}
				else
					printf("《%s》(书号%s)已经被借完\n",CurrP->bname,CurrP->bno);
				break;
				
			}
		}
		if (bFindBookFlag = false)
		{
			printf("书号为%s的书不存在",bno);
		}
	} while (bFindBookFlag = false);	
}

void BackBook(BookRecType **head)
{
	char bno[5];
	BookRecType * CurrP=NULL/*指向当前节点的指针*/;
	bool bFindBookFlag=false;
	if (*head == NULL) printf("请先选择1-->2 从文件中读取数据\n");
	do 
	{	
		printf("请输入书号bno=");
		scanf("%s",bno);
		for (CurrP = *head ; CurrP!=NULL; CurrP = CurrP->next)
		{
			if (strcmp(bno,CurrP->bno)==0)
			{
				bFindBookFlag=true;
				if (CurrP->borrownum >0)
				{
					CurrP->storenum ++;
					CurrP->borrownum --;
					printf("《%s》(书号%s)已成功还书!\n",CurrP->bname,CurrP->bno);
				}
				else
					printf("《%s》(书号%s)不存在被借阅的记录，请核对\n",CurrP->bname,CurrP->bno);
				break;	
			}
		}
	}while (bFindBookFlag = false);
}