最近在幫考研跨考計算機的朋友學習c語言，from zero.
用單鏈表實現了乙個賬戶的管理系統。
麻雀雖小，五臟俱全。單鏈表的增刪改查（crud）全在裡面了，結構也很清晰，適合初學者學習鍊錶的基本操作。
#include
#include
#include
#define _crt_secure_no_deprecate
#define _crt_secure_no_warnings
#define buffer_size 100
#define max_account_username_length 20
#define max_account_password_length 20
typedef
struct _accountaccount;
enum choices
;account* accoutlinkedlist =
null
;void
printusage()
;void
createaccount()
;account*
findusername
(const
char
* username)
;void
retrieveaccount()
;void
updateaccount()
;void
deleteaccont()
;void
seeallacount()
;void
deleteallaccount()
;int
main
(int argc,
char
const
*ar**)
putchar
('\n');
printf
("press any key to continue.\n");
getchar()
;//eat the \n
getchar()
;//choke
}return0;
}void
printusage()
void
createaccount()
else
iter->next = a;
}printf
(,a->username,a->password );}
account*
findusername
(const
char
* username)
}return iter;
}void
retrieveaccount()
printf
("username[%s] setted the password to [%s].\n"
,iter->username,iter->password);}
void
updateaccount()
//update
printf
("old password is [%s], key in a new one, max length allowed = %d.\n"
,iter->password,max_account_password_length)
;scanf
("%s"
,buffer)
;strncpy
(iter->password,buffer,max_account_password_length)
;printf
("username[%s] setted the password to [%s].\n"
,iter->username,iter->password);}
void
deleteaccont()
}if(!isfound)
if(prev)
else
free
(iter)
;printf
("deleted!");
}void
seeallacount()
}void
deleteallaccount()
accoutlinkedlist =
null
;printf
("completed!\n");
}
歡迎介面建立賬戶key in a number to select a menu...1. create a account
2. retrieve password with a username
3. update password for a username
4. delete a existing account from the system
5. see all accounts in the system
6. delete all accounts from the system
獲取賬戶密碼create a accountthe system won't check if the username already exists.
key in the username, max length allowed = 20.
sunkey in the password for user[sun],max length allowed = 20.
114514
press any key to continue.
更新賬戶密碼//存在retrieve a account
key in the username, max length allowed = 20.
sunusername[sun] setted the password to [114514].
press any key to continue.
//不存在
retrieve a account
key in the username, max length allowed = 20.
otaku
username[otaku] does not exist.
press any key to continue.
刪除賬戶//存在update a account
key in the username, max length allowed = 20.
sunold password is [114514], key in a new one, max length allowed = 20.
1919810
username[sun] setted the password to [1919810].
press any key to continue.
//不存在
update a account
key in the username, max length allowed = 20.
foobar
username[foobar] does not exist.
press any key to continue.
檢視所有賬戶//存在update a account
key in the username, max length allowed = 20.
sundeleted!
press any key to continue.
//不存在
update a account
key in the username, max length allowed = 20.
sunusername[sun] does not exist.
press any key to continue.
刪除所有賬戶see all accountsaccount #0
username:sun
password:114514
account #1
username:otaku
password:1919810
account #2
username:gnuisnotunix
password:wineisnotemulator
press any key to continue.
completed!press any key to continue.
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