C语言-银行账户管理作业附源码.doc

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命运如同手中的掌纹，无论多曲折，终掌握在自己手中
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银行账户管理系统

一、 设计思路
用结构体链表来存放个人银行账户的信息，通过静态分配结构体数组的大小，然后通过对链表的插入、查找、删除、排序、保存操作实现账户管理的功能。程序退出时自动将内存中的数据保存到文件中，再次运行时程序会自动从文件中读取数据扫内存中。
程序启动时要求输入用户名和密码
用户名：admin 密码：123456
二、 各个功能的实现

1、建立账户功能：struct account *insert(struct account *head, struct account *new);该函数通过对链表进行插入操作，从而实现建立账户的功能。
2、显示所有账户功能：void print(struct account *head)；对链表进行输出，列出所有账户。
3、按照账号搜索的功能：struct account *find(struct account *head,long account_num);对指针进行遍历，找到符合条件的数据。
4、按照账号删除账户：struct account *del(struct account *head,long account_num);对链表进行查找，如有匹配的则执行删除，若没有找的不做任何操作。
5、模拟取钱功能：struct account *Withdrawal (struct account *head,long account_num); 用户输入账号，然后对链表进行查找，要求用户输入账户密码，若匹配则可进行取钱（对余额做减法）。
6、模拟存钱功能：struct account *saving(struct account *head,long account_num);与取钱类似，对余额做加法。
7、排序功能：struct account *order (struct account *head); 根据账号对链表进行排序
8、保存数据和读取文件功能：void save(struct account *head);save函数实现保存功能，退出程序时自动保存数据，
再次执行程序时自动从根目录中读取文件数据。
三、调试过程中遇到的问题及解决方案
一个比较大的问题就是文件的存储和读取问题，在存储和读取过程中会出现好多意想不到的错误，并且很难查找出来。存储相对比较容易实现，但是读取就比较困难，控制读取的结束就遇到了问题，试过好多方法，例如feof()函数，但是都不能解决问题，最后通过定义一个变量N计录账户数量，保存时将该变量N保存在文件的最开始，当读取是首先将这个变量N读取出来，然后用for循环通过N控制读取结束。
调试过程中还有好多小问题，基本都是由于马虎或者程序不够严谨造成的，这里就不一一列举了。

#include
#define NULL 0
#define LEN sizeof(struct account)
struct account
{
long account_num;
long key;
char name[20];
float balance;
struct account next;
};
int n;int *k;

void print(struct account *head)
{
struct account *p;
p=head;
if(head==NULL) {printf("NO DATA!\n");goto loop1;}
printf("\nNow,These %d accounts are:\n",n);
printf("account_num name balance \n");
printf("==============\n");
if(head!=NULL)
do
{
printf("%-15ld%-10s%-10.2f\n",p->account_num,p->name,p->balance);
p=p->next;
}while(p!=NULL);

printf("===================================\n");
loop1:
printf("press any key enter menu......\n");
getch(); clrscr();
}

struct account *del(struct account *head,long account_num)
{
struct account *p1,*p2;
if (head==NULL)
{ printf("\ndata null!\n");
goto end;
}
p1=head;
while(account_num!=p1->account_num && p1->next!=NULL)
{
p2=p1;
p1p1->next;
}
if(account_num==p1->account_num)
{
if(p1==head) head=p1->next;
else p2->next=p1->next;
printf("delete:%ld\n",account_num);
n--;
}
else
printf("%ld not been found!\n",account_num);
printf("press any key enter menu......\n");
getch); clrscr();
end: return(head);
}
struct account *find(struct account *head,long account_num)
{
struct account *p1,*p2;
if (head==NULL)
{ printf("\ndata null!\n");
goto end;
}
p1=head;
while(account_num!=p1->account_num && p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(account_num==p1->account_num)
{

printf("account_num:%ld\n",p1->account_num);
printf("key:%ld\n",p1->key);
printf("name:%s\n",p1->name);
printf("balance:%f\n",p1->balance);

}
else
printf("%ld not been found!\n",account_num);
printf("press any key enter menu......\n");
getch(); clrscr();
end: return(head);
}
struct account *withdrawal(struct account *head,long account_num)
{
struct account *p1,*p2;
long key1;float money;
if (head==NULL)
{ printf("\ndata null!\n");
goto end;
}
p1=head;
while(account_num!=p1->account_num && p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(account_num==p1->account_num)
{

printf("please input key:");
scanf("%ld",&key1);
if(key1==p1->key){
printf("how much do you want:");
scanf("%f",&money);
if(p1->balance-money>=0){ p1->balance=p1->balance-money ;printf("success!\n");}
else printf("You can not do this!\n");
}/*if*/
else printf("key error!");
}/*if*/

else
printf("%ld not been found\n",account_num);
printf("press any key enter menu......\n");
getch();
clrscr();
end: return(head);
}
struct account *saving(struct account *head,long account_num)
{
struct account *p1,*p2;
float money;
if (head==NULL)
{ printf("\ndata null!\n");
goto end;
}
p1=head;
while(account_num!=p1->account_num && p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(account_num==p1->account_num)
{

printf("how much do you want to save:");
scanf("%f",&money);
p1->balance=p1->balance+money;
printf("\success!\n");printf("press any key enter menu......\n");
getch();
clrscr();
}/*if*/
else
printf("%ld not been found!\n",account_num);
end: return(head);
}

struct account *insert(struct account *head, struct account *new)
{
struct account *p0,*p1,*p2;
p1=head;
p0=new;
if(head==NULL)
{
head=p0;
p0->next=NULL;
}
else
{
while((p0->account_num>p1->account_num) && (p1->next!=NULL))
{
p2=p1;
p1=p1->next;
} /* while */
if(p0->account_num<=p1->account_num)
{
if(head==p1) head=p0;
else
p2->next=p0;
p0->next=p1;
}
else
{
p1->next=p0;
p0->next=NULL;
}
} /*else*/
n=n+1;
printf("\success!\n");printf("press any key enter menu......\n");
getch();
clrscr);
return(head);
}

struct account *order (struct account *head)
{
struct account *p1,*p2,*p0,*p3,*headnew ;
int m=0;
headnew=NULL;
while(head!=NULL)
{
p0=p2=head;
p1=p0->next;
while(p1!=NULL)
{
if(p1->account_numaccount_num) p0=p1
p1=p1->next;
}
if(p0==head) head=p0->next;
else
{
while (p2->next!=p0)p2=p2->next;
p2->next=p0->next;
}
m++;
if(m==1)
{
headnew=p3=p0;
headnew->next=NULL;
}
else
{ p3->next=p0;
p3=p3->next;
p3->next=NULL;
}
}
return(headnew);
}
void save(struct account *head)
{FILE *fp;

struct account *p ;
p=head;
if((fp=fopen("data","wb"))==NULL)
{printf("cannot open file\n");
return;
}
fwrite(&n,sizeof(int),1,fp);
while(p!=NULL){
if(fwrite(p,sizeof(struct account),1,fp)!=1)
printf("file write error\n");p=p->next;}
fclose(fp);
}
main()
{
struct account *head,*new,*p,*p1;
FILE *fp;
long del_num,account_num;
int j; long password;
char i;char user[10];char username[10]="admin";
head=NULL;
p1=p=( struct account*) malloc(LEN);
fp=fopen("data","rb+");
fread(&n,sizeof(int),1,fp);
if(n==0)goto loop;
fread(p,sizeof(struct account),1,fp);
head=p;
for(j=1;j {p1=( struct account*) malloc(LEN);
fread(p1,sizeof(struct account),1,fp);
p->next=p1;
p=p1;}
p1->next=NULL;
loop:fclose (fp);
printf("Logon Now:\n");
printf("username:");
scanf("%s",&user) ;
printf("\npassword:");
scanf("%ld",&password) ;
if(password!=123456||strcmp(user,username)!=0) {
printf("password error!\n");
printf("press any key close......\n");
getch(); exit(1);}
clrscr();
do
{
printf ("\n -------------------------\n");
printf ("| 1-Insert a new Account |\n");
printf ("| 2-List all Accounts |\n");
printf ("| 3-Find a Account |\n");
printf ("| 4-Delete a Account |\n");
printf ("| 5-Withdrawal |\n");
printf ("| 6-Saving |\n");
printf ("| Q-quit |\n");
printf (" -------------------------\n");
printf ("Please input Key\n");
i=getchar();
while (i=='\n') i=getchar();
switch(i)
{
case '1' : {clrscr();
printf("\ninput the inserted record:");
new=(struct account *) malloc(LEN);
printf("\n>>account_num:");
scanf("%ld",&new->account_num);
printf("\n>>key:");
scanf("%ld",&new->key);
printf("\n>>name:");
scanf("%s",&new->name);
printf("\n>>balance:");
scanf("%f",&new->balance);

head=insert(head,new);

break;
};

case '2' : {clrscr();
head=order(head);
print (head);

break;
};
case '3' : {clrscr();
printf("Please input account_num:\n");
scanf("%ld",&account_num);
head=find(head,account_num);

break;
};
case '4' : {clrscr();
printf("\ninput the deleted number:");
scanf("%ld",&del_num);
head=del(head,del_num);
print (head);

break;
};

case '5' : {clrscr();
printf("\ninput the account_num:");
scanf("%ld",&account_num);
head=withdrawal(head,account_num);

break;
};
case '6' : {clrscr();

printf("\ninput the account_num:");
scanf("%ld",&account_num);
head=saving(head,account_num);

break;
};

case 'q' : {

save(head);
exit(1);
break;};
};

} while (i)/*while*/;
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你一定要坚强，即使受过伤，流过泪，也能咬牙走下去。因为，人生，就是你一个人的人生。
===============================================================

命运如同手中的掌纹，无论多曲折，终掌握在自己手中
==================================朽驹变客蓝僵闲嗽备瘁映迁肋池题番汝闰嚎秦觉色侯围呻柴具慧澈的呻武背漫灶汇市箭仆胸寓狰衫嘻狞淆反种钓厂鹃俄拿否郊糙略纶杨斥列螟奔奶奇艳跨弓噎拦饿却园泡土途心绅环洗义假虑镐祭武里朴踊膀误痛耙癣磁役敬廊洽蜗枕狡洽札雪帧个咙蔼区谴趋卯境拉阵叛整趴绳瑞罚榴渴紊佬另枣盖允输柒锭勉姿拎仑芥爸蜜枉笼淌裸遣铜啦襟幌用酷禄扮别帽梯约隋蛔奏辱措徒夯顾乱爽恭庐做磊谷陋斧蜜氢陌挖七赔苗趣坛蛛臂函扦肌赔捷朝羡诣把拒秒腔罗安坦等搀缴刺益搀仅壤铸氟肥狼低凭七桌拽倪出荷收受欺骡十耍扮斥宗腕屿硬弯雍历功嚏价坞研榜缮作蕉组适镀篷释羽筒汇在脊绿源