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这篇文章主要介绍“怎么用C语言实现银行系统”，在日常操作中，相信很多人在怎么用C语言实现银行系统问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”怎么用C语言实现银行系统”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
main.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <windows.h>
#define MaxNum 200
#define N_P 6
typedef struct
{
int AccountNumber[3];
char name[20];
char password[N_P+1];
unsigned long amount;
int state;
} Account;
void Load(FILE *,Account *);
void ShowMenu(int );
int MakeChoice(int );
void EnterPassword(char *);
void CreatAccount(unsigned char *,Account *,int); //第一个参数为加密关键字，第二个参数为账户序号
int JudgePassword(char *,char *);
int decrypt(int *,unsigned char *);
void LogIn(unsigned char *,Account *,int); //第二个参数为当前账户数目,登陆成功返回1，失败返回0
int EnterAccountNumber(unsigned char *,int );
void EnterNum(char *,int );
void Operate(unsigned char *,Account *,int ,int );
void ShowSubMenu(char *);
void AdministratorMode(unsigned char *,unsigned char *,Account *,char *,int);
void ShowAdministratorMenu();
void WriteToFile(FILE *,unsigned char *,Account*,char *,int);
int main()
{
FILE *fp;
int i,total;
unsigned char key[4],key_en[4];
char administrator_password[10];
Account *user;
user=(Account *)malloc(sizeof(Account)*MaxNum);
fp=fopen("bank.txt","r+");
if(fp==NULL)
{
printf("银行数据库无法打开，按任意键结束程序！\n");
getch();
exit(1);
}
fscanf(fp,"%d\n%s\n%s",&total,administrator_password,key);
for(i=0;i<3;++i)//用key_en保存key的值
key_en[i]=key[i];
key_en[0]=(key_en[0]<<3)|(key_en[0]>>(sizeof(key_en[0])*8-3));
key_en[2]=(key_en[2]>>3)|(key_en[2]<<(sizeof(key_en[2])*8-3));
Load(fp,user);//将数据存入数组user中
while(1)
{
system("cls");
ShowMenu(total);
switch(MakeChoice(4))
{
case 1:
system("cls");
LogIn(key_en,user,total);
break;
case 2:
system("cls");
CreatAccount(key_en,user,total++);
break;
case 3:
system("cls");
AdministratorMode(key,key_en,user,administrator_password,total);
break;
default:
system("cls");
WriteToFile(fp,key,user,administrator_password,total);
return 0;
}
}
return 0;
}function.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <windows.h>
#define MaxNum 200
#define N_P 6
//账户状态 0为正常 1为挂失 2为冻结 3为销户
typedef struct
{
int AccountNumber[3];
char name[20];
char password[N_P];
unsigned long amount;
int state;
} Account;
void Load(FILE *,Account *);
void ShowMenu(int );
int MakeChoice(int );
void EnterPassword(char *);
void CreatAccount(unsigned char *,Account *,int); //第一个参数为加密关键字，第二个参数为账户序号
int JudgePassword(char *,char *);
int decrypt(int *,unsigned char *);
void LogIn(unsigned char *,Account *,int); //第二个参数为当前账户数目,登陆成功返回1，失败返回0
int EnterAccountNumber(unsigned char *,int );
void EnterNum(char *,int );
void Operate(unsigned char *,Account *,int,int );
void ShowSubMenu(char *);
void AdministratorMode(unsigned char *,unsigned char *,Account *,char *,int);
void ShowAdministratorMenu();
void WriteToFile(FILE *,unsigned char *,Account*,char *,int);
void Load(FILE *fp,Account *user)
{
int count=0;
//将文件中的用户信息存到数组中
while(fscanf(fp,"\n%d%d%d %s %s %lu %d\n",&user[count].AccountNumber[0],&user[count].AccountNumber[1],\
&user[count].AccountNumber[2],user[count].name,\
user[count].password,&user[count].amount,&user[count].state)!=EOF)
++count;
}
void ShowMenu(int total)
{
printf("****中国银行烟大计163-1分行****\n");
printf("目前共有%d名注册用户*****\n",total);
printf("1.登陆*************************\n");
printf("2.开户*************************\n");
printf("3.进入管理员模式***************\n");
printf("4.退出*************************\n");
}
int MakeChoice(int n)
{
int judge;
printf("请输入1~%d\n",n);
scanf("%d",&judge);
while(judge<1||judge>n)//确保输入的是1~n
{
printf("输入不合法，请输入1~%d\n",n);
fflush(stdin);//如果不加这句，输入一些字母会导致函数无限循环
scanf("%d",&judge);
}
return judge;
}
void EnterPassword(char *password)
{
int i;
char t;
for(i=0; i<N_P; ++i)
{
t=getch();
if(t=='\b')//执行退格删除操作
{
printf("\b \b");
i-=2;
continue;
}
while(t<'0'||t>'9')
t=getch();
password[i]=t;
putchar('*');
}
}
void EnterNum(char *s,int n)
{
int i=0;
char t;
while(i<n)
{
t=getch();
if(t=='\b')
{
printf("\b \b");
--i;
continue;
}
else if(t=='\r'||t=='\n')
break;
while(t<'0'||t>'9')
t=getch();
s[i]=t;
putchar(t);
++i;
}
}
int JudgePassword(char *temp_password,char *password)
{
int i;
for(i=0; i<N_P; ++i)
{
if(temp_password[i]!=password[i])
break;
}
if(i==N_P)
return 0;
else
return 1;
}
void CreatAccount(unsigned char *key,Account *user,int num)
{
if(num>=MaxNum)
{
printf("银行用户数量已达到上限！\n按任意键返回主界面");
getch();
return;
}
int i,flag,num_de[3];
int num_en[3];
char temp_password[N_P],password[N_P];
//将num的个位十位和百位分解，num_de[2]存个位，以此类推
for(i=0; i<3; ++i)
num_de[i]=0;
for(i=0; i<3; ++i)
num_en[i]=0;
if(num<10)
num_de[2]=num;
else if(num<100)
{
num_de[2]=num%10;
num_de[1]=num/10;
}
else
{
for(i=0; i<3; ++i)
{
num_de[i]=num%10;
num/=10;
}
}
//分解完成
while(1)
{
flag=0;
printf("请输入用户姓名：");
fflush(stdin);
scanf("%19[^\n]",user[num].name);
for(i=0; i<strlen(user[num].name); ++i)
{
if(user[num].name[i]==' ')
{
printf("用户名中不能包含空格！\n");
flag=1;
break;
}
}
if(flag==0)
break;
}
for(i=0; i<3; ++i)
num_en[i]=num_de[i]^key[i];
for(i=0; i<3; ++i)
user[num].AccountNumber[i]=num_en[i];
printf("您的账号是：");
for(i=0; i<3; ++i)
printf("%03d ",num_en[i]);
while(1)
{
printf("\n请设置密码：");
EnterPassword(password);
printf("\n请再次确认密码：");
EnterPassword(temp_password);
if(JudgePassword(temp_password,password))
printf("\n两次输入不相等，密码设置失败！");
else
{
strcpy(user[num].password,password);
user[num].password[N_P]='\0';
break;
}
}
user[num].amount=0;
user[num].state=0;
printf("\n账户创建成功！\n按任意键返回主菜单");
getch();
}
int decrypt(int *num_en,unsigned char *key)
{
int i,num,num_de[3];
for(i=0; i<3; ++i)
num_de[i]=num_en[i]^key[i];
num=num_de[0]*100+num_de[1]*10+num_de[2];
return num;
}
int EnterAccountNumber(unsigned char *key,int total)
{
int i,num;
int num_en[3];
char num_en_char[3];
while(1)//输入账号
{
printf("请输入账号：");
for(i=0;i<3;++i)
{
EnterNum(num_en_char,3);
num_en[i]=atoi(num_en_char);
}
num=decrypt(num_en,key);
if(num>total)//若num大于total则账号输入错误
printf("\n账号输入错误！\n");
else
break;
}
return num;
}
void LogIn(unsigned char *key,Account *user,int total)
{
int num,i;
char password[N_P];
num=EnterAccountNumber(key,total);
//判断账户状态
if(user[num].state==3)
{
printf("该账户已销户，无法使用！\n");
printf("按任意键返回操作界面");
getch();
return;
}
else if(user[num].state==2)
{
printf("该账户因输入密码错误次数达三次，已冻结！\n请进入管理员模式解除异常状态！\n");
printf("按任意键返回操作界面");
getch();
return;
}
//判断结束
i=0;
while(1)//输入密码
{
printf("\n请输入密码：");
EnterPassword(password);
if(JudgePassword(password,user[num].password)&&(++i<3))
printf("\n密码输入错误，您还有%d次机会\n",3-i);
else if(i>=3)
{
user[num].state=2;
printf("\n密码错误次数过多，账户已冻结!\n");
printf("即将返回主界面 ");
for(i=0; i<3; ++i)
{
printf("%d",i);
Sleep(1000);
printf("\b");
}
return ;
}
else
{
printf("登陆成功！\n");
break;
}
}
Operate(key,user,num,total);
}
void ShowSubMenu(char *name)
{
printf("****欢迎%s登陆本行********\n",name);
printf("1.存款*************************\n");
printf("2.取款*************************\n");
printf("3.查询*************************\n");
printf("4.转账*************************\n");
printf("5.挂失*************************\n");
printf("6.销户*************************\n");
printf("7.改密*************************\n");
printf("8.返回主菜单*******************\n");
}
void Operate(unsigned char *key,Account *user,int num,int total)
{
int i,num_t;
unsigned long amount_t,max=1;
char password[N_P],temp_password[N_P],amount_judge[6];
for(i=0; i<(sizeof(unsigned long)*8-1); ++i) //计算最大存款额max
max*=2;
while(1)
{
system("cls");
ShowSubMenu(user[num].name);
switch(MakeChoice(8))
{
case 1:
system("cls");
while(1)
{
printf("请输入存款金额：");
for(i=0;i<6;++i)
amount_judge[i]='\0';
EnterNum(amount_judge,5);
amount_t=atol(amount_judge);
if(amount_t>99999)
printf("\n单次存款金额为0~99999元，存款失败！\n");
else if(amount_t>=max-user[num].amount)
printf("总金额超出上限，存款失败！\n");
else
{
user[num].amount+=amount_t;
printf("\n存款成功！按任意键返回操作界面");
getch();
system("cls");
break;
}
}
break;
case 2:
system("cls");
if(user[num].state==1)
{
printf("该账户已挂失，无法执行取款操作！\n");
printf("按任意键返回操作界面");
getch();
break;
}
while(1)
{
printf("请输入取款金额：");
for(i=0;i<6;++i)
amount_judge[i]='\0';
EnterNum(amount_judge,5);
amount_t=atol(amount_judge);
if(amount_t>99999)
printf("\n单次存款金额为0~99999元，存款失败！\n");
else if(amount_t>user[num].amount)
printf("\n账户余额不足，取款失败!\n");
else
{
user[num].amount-=amount_t;
printf("\n取款成功！按任意键返回操作界面");
getch();
system("cls");
break;
}
}
break;
case 3:
system("cls");
printf("用户姓名：%s",user[num].name);
printf("账户余额：%lu\n",user[num].amount);
printf("账户状态：");
if(user[num].state==1)
printf("已挂失\n");
else
printf("正常\n");
printf("按任意键返回操作界面");
getch();
system("cls");
break;
case 4:
system("cls");
if(user[num].state==1)
{
printf("该账户已挂失，无法执行转账操作！\n");
printf("按任意键返回操作界面");
getch();
break;
}
num_t=EnterAccountNumber(key,total);
while(1)
{
printf("请输入转账金额：");
for(i=0;i<6;++i)
amount_judge[i]='\0';
EnterNum(amount_judge,5);
amount_t=atol(amount_judge);
if(amount_t>99999)
printf("\n单次存款金额为0~99999元，存款失败！\n");
else if(amount_t>user[num].amount)
printf("账户金额不足，转账失败!\n");
else if(amount_t>=max-user[num_t].amount)
printf("\n对方总金额超出上限，转账失败！\n");
else
{
user[num].amount-=amount_t;
user[num_t].amount+=amount_t;
printf("\n转账成功！按任意键返回操作界面");
getch();
system("cls");
break;
}
}
break;
case 5:
system("cls");
printf("您确定要挂失吗？\n");
printf("1.确定 2.取消\n");
if(MakeChoice(2)==1)
{
user[num].state=1;
printf("挂失成功！\n按任意键返回主界面");
getch();
}
system("cls");
break;
case 6:
system("cls");
printf("您确定要销户吗？销户后所有功能都将无法实现，账户内的存款将冻结！\n");
printf("1.确定 2.取消\n");
if(MakeChoice(2)==1)
{
user[num].state=3;
printf("销户成功！\n按任意键返回主界面");
getch();
system("cls");
return;
}
else
break;
case 7:
system("cls");
while(1)
{
printf("\n请输入原密码：");
EnterPassword(password);
if(JudgePassword(password,user[num].password))
printf("\n原密码输入错误！\n");
else
break;
}
while(1)
{
printf("\n请输入新密码：");
EnterPassword(password);
printf("\n请再次确认密码：");
EnterPassword(temp_password);
if(JudgePassword(temp_password,password))
printf("\n两次输入不相等，密码设置失败！");
else
{
strcpy(user[num].password,password);
break;
}
}
printf("\n密码修改成功！\n按任意键返回操作界面");
getch();
system("cls");
break;
default:
return;
}
}
}
void AdministratorMode(unsigned char *key_orig,unsigned char *key,Account *user,char *administrator_password,int total)
{
int num;
char password[N_P],temp_password[N_P];
while(1)//输入密码
{
printf("请输入管理员密码密码：");
EnterPassword(password);
if(JudgePassword(password,administrator_password))
printf("密码输入错误！\n");
else
break;
}
printf("\n登陆成功！按任意键继续");
getch();
while(1)
{
system("cls");
ShowAdministratorMenu();
switch(MakeChoice(6))
{
case 1:
system("cls");
num=EnterAccountNumber(key,total);
printf("请设置密码：");
EnterPassword(password);
printf("您设置的密码是：");
puts(user[num].password);
printf("\n按任意键返回操作界面");
getch();
break;
case 2:
system("cls");
num=EnterAccountNumber(key,total);
printf("您确定要解除此用户的挂失状态吗？\n");
printf("1.确定 2.取消\n");
if(MakeChoice(2)==1)
{
user[num].state=0;
printf("解除挂失成功！\n按任意键返回主界面");
getch();
}
break;
case 3:
system("cls");
num=EnterAccountNumber(key,total);
printf("\n您确定要解除此用户的冻结状态吗？\n");
printf("1.确定 2.取消\n");
if(MakeChoice(2)==1)
{
user[num].state=0;
printf("解除冻结成功！\n按任意键返回主界面");
getch();
}
break;
case 4:
system("cls");
while(1)
{
printf("请输入新密码：");
EnterPassword(password);
printf("\n请再次确认密码：");
EnterPassword(temp_password);
if(JudgePassword(temp_password,password))
printf("\n两次输入不相等，密码设置失败！\n");
else
{
strcpy(administrator_password,password);
break;
}
}
printf("\n管理员密码修改成功！\n按任意键返回操作界面");
getch();
break;
case 5:
system("cls");
printf("当前的账号生成关键字为“%s”，更改之后所有之前创建的账户将无法打开！\n",key_orig);
printf("您确定要更改账号生成关键字吗？\n");
printf("1.确定 2.取消\n");
if(MakeChoice(2)==1)
{
printf("请输入新的关键字：");
scanf("%3s",key_orig);
printf("当前的关键字已更改为“%s”\n按任意键返回操作界面",key_orig);
getch();
}
break;
default:
return;
}
}
}
void ShowAdministratorMenu()
{
printf("****中国银行烟大计163-1分行****\n");
printf("**********管理员模式***********\n");
printf("1.修改用户密码*****************\n");
printf("2.解除挂失*********************\n");
printf("3.解除冻结*********************\n");
printf("4.修改管理员密码***************\n");
printf("5.修改账号生成关键字***********\n");
printf("6.返回主界面*******************\n");
}
void WriteToFile(FILE *fp,unsigned char *key,Account *user,char *administrator_password,int total)
{
int i,j;
rewind(fp);
fprintf(fp,"%d\n%6s\n%3s\n",total,administrator_password,key);
for(i=0; i<total; ++i)
{
for(j=0; j<3; ++j)
fprintf(fp,"%03d ",user[i].AccountNumber[j]);
fprintf(fp,"%s %6s %lu %d\n",user[i].name,user[i].password,\
user[i].amount,user[i].state);
}
fclose(fp);
}到此，关于“怎么用C语言实现银行系统”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！
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