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Bank ATM Deposit and Withdrawal System

The business description of the bank ATM deposit and withdrawal system is as follows:

The bank ATM deposit and withdrawal system can provide users with functions such as deposit, withdrawal, inquiry, transfer, and password modification. To simulate a real ATM business environment, this system must implement functions such as deposit, withdrawal, inquiry, transfer, password modification, and account opening. Users can open a bank account through the account opening service in this system, and then log in to the ATM system using this bank account to perform operations such as deposit, withdrawal, query account information, and modify passwords. The various services of this system have the following points to note:

• (1) Logging into the system

Before logging in, users must enter their bank account on the login screen and log in to the system using the correctly entered bank account.

• (2) Account opening service

To use this system, one must first perform the account opening service to establish a new bank account, and store the newly opened bank account in a file. At the same time, the system uses the ID card number as a sufficient condition for account opening, meaning that one ID card number can only open one bank account.

• (3) Deposit service

After logging into the system, customers can choose the deposit service to deposit the entered deposit amount into the corresponding account.

• (4) Withdrawal service

After logging into the system, customers can choose the withdrawal service to withdraw the entered withdrawal amount from the corresponding bank account, but the withdrawal amount must be greater than the current account balance.

• (5) Inquiry service

After logging into the system, customers can choose the inquiry service to check the account balance.

• (6) Transfer service

After logging into the system, customers can choose the transfer service to make a transfer. Note that the destination account for the transfer must be an existing bank account in this system.

• (7) Password modification

After logging into the system, customers can choose the password modification service to change their password.

Implemented effects

Source Code

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 1000 
#include<conio.h>
struct chuhu{
 char idnum[9];//Account 
 char name[10];//Name
 char idnumber[20];//ID card number
 char password[7];//Password 
 double cunkuan;//Deposit 
}hu[N]; 

void date();//Display current date
int a,a1;//Main interface selection variables 
void Flag1();//Main interface
void Flag2();//User interface 
void Flag3();//User function selection interface
void zhuce();//Registration 
int yanzheng();//Validate deposit slip number or password 
//&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
void qukaun();//Withdrawal
void cunkaun();//Deposit
void display();//Inquiry
void zhuan();//Transfer 
void xiugai();//Password modification 
void display();//Search 
//&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
 int A,key;//Number of account holders 
 int i;//Control password loop 
 char ch='y';//Whether to continue registration 
 double jin;//Money to be deposited 
 int t;

 char id[11],password[7];

int main(){
system("COLOR 0A"); int b;
 Flag1();//Introduce main interface
 do{

 printf("\n\n\t\t##Please enter your choice:");
 scanf("%d",&a); 
 switch(a){
  case 1:{
   zhuce();//Registration
   Flag1(); 
   break;
  }
  case 2:{
   b=yanzheng();
   fflush(stdin);///Good thing, to prevent skipping data
   Flag2();
   break;
  } 
  case 3:exit(0);break;
  default:printf("\n\n\n\t\tYour input data does not meet the requirements!!!\n\n\n\n\n");
  }

 }while(1);
}

void Flag1(){
 printf("\n#################################################################################\n");
    printf("\n▓                          * Bank Fixed Deposit Management System  *                           ▓\n");
    printf("\n#################################################################################\n");
 printf("\n          ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆\n");
 printf("          |◆|******|◆|                                     |◆|******|◆|\n");
 printf("          |◆|******|◆|       ☆ Account Opening Service    Press 1         |◆|******|◆|\n"); 
 printf("          |◆|******|◆|       ☆ Login System    Press 2         |◆|******|◆|\n");
 printf("          |◆|******|◆|       ☆ Exit        Press 3         |◆|******|◆|\n");
 printf("          |◆|******|◆|                                     |◆|******|◆|\n");
 printf("          ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆\n");
 printf("\n#################################################################################\n");
 
} 
//********************************************************************************************************************

//User interface  Follow the public account: C Language Chinese Community, follow to receive 300G programming materials for free
void Flag2(){
       int a,b;//Variable for selecting functions
    do{
     printf("\n\nPress ENTER to enter, return to the main menu " );
     fflush(stdin);
     scanf("%c",&ch);
     system("cls");//Clear screen
     date(); 
 printf("\n#################################################################################\n");
    printf("\n▓                               * Welcome to use  *                                 ▓\n");
    printf("\n#################################################################################\n");
 printf("\n          ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆\n"); 
 printf("          |◆|******|◆|        ☆ Deposit Service       Press 1        |◆|******|◆|\n"); 
 printf("          |◆|******|◆|        ☆ Withdrawal Service       Press 2        |◆|******|◆|\n");
 printf("          |◆|******|◆|        ☆ Inquiry Service       Press 3        |◆|******|◆|\n"); 
 printf("          |◆|******|◆|        ☆ Transfer Service       Press 4        |◆|******|◆|\n");
 printf("          |◆|******|◆|        ☆ Modify Password       Press 5        |◆|******|◆|\n");
 printf("          |◆|******|◆|        ☆ Exit System       Press 6        |◆|******|◆|\n"); 
 printf("          |◆|******|◆|                                        |◆|******|◆|\n");
 printf("          ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆\n");
    printf("\n#################################################################################\n");
    printf("\n▓                          *******************************                    ▓\n");
    printf("\n#################################################################################\n");
 printf("\n\n\t\t##Please enter your choice:");
 fflush(stdin);
 scanf("%d",&a);
 switch(a){//Registration
  case 1: { system("cls");fflush(stdin);cunkaun();break;//Deposit
   
  } 
  case 2:  {system("cls");fflush(stdin);qukaun();break;//Withdrawal
 
  }
  case 3: {display();//Inquiry service
   break;
  }
  case 4:{system("cls");fflush(stdin);zhuan();break;//Transfer
  
  }
  case 5: {system("cls");fflush(stdin);xiugai();break;//Password modification
  
  }
  case 6: exit(0);
  default:printf("You entered an incorrect choice, please enter the correct option:");
                                                        
 }
  } while(1);
} 
//********************************************************************************************************************
//User function selection interface 
void Flag3(){
 printf("\n\n\t\t##Please enter your choice:");
 scanf("%d",&a1);
 switch(a1){
  case 1:printf("Deposit service");break; 
  case 2:printf("Withdrawal service");break; 
  case 3:printf("Inquiry service");break; 
  case 4:printf("Transfer service");break; 
  case 5:printf("Password modification");break;
  case 6:printf("Exit");break;  
 } 
}
//********************************************************************************************************************
//Account opening 
void zhuce(){
 FILE *nchuhu=fopen("chuh.txt","r");
 FILE *fchuhu=fopen("chuh.txt","a");
 int i;
 if((nchuhu=fopen("chuh.txt","r"))==NULL) printf("File does not exist, system creates it\n"); 
 do{
  system("cls");
 date();//Display current date 
 printf("\n\n\t\tPlease enter the new depositor's information:");
 fscanf(nchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[A].idnum,&hu[A].name,&hu[A].idnumber,&hu[A].password,&hu[A].cunkuan); 
 
 printf("\n\n\t\tDepositor's deposit slip:");
 fflush(stdin);
 gets(hu[A].idnum);
 printf("\n\t\tName:");
 fflush(stdin);
 gets(hu[A].name);
 printf("\n\t\tDepositor's password (6 digits):");
 for(i=0;i<6;i++){ 
  fflush(stdin);
  hu[A].password[i]=getch();
  printf("*");
 // scanf("%d",&hu[A].password[i]);
 } 
 
 do{
  printf("Please enter the ID card number (18 digits):");
  fflush(stdin);
  gets(hu[A].idnumber);
  if(strlen(hu[A].idnumber)!=18)//strlen means
  printf("\n\t\tInput error!\n\t\tID card must be 18 digits or letters\n");
  for(i=0;i<A;i++)
  if(strcmp(hu[A].idnumber,hu[i].idnumber)==0&&strcmp(hu[A].name,hu[i].name)==0) 
  break;
  
  if(i<A) 
    printf("\n\n\t\tSomeone has already registered with this ID card\n\n\t\tPlease re-enter the ID card number:\n");
    
 }while((strlen(hu[A].idnumber)!=18)||(strcmp(hu[A].idnumber,hu[i].idnumber)==0)&&(strcmp(hu[A].name,hu[i].name)!=0) );
 
 printf("Input the amount to be stored:");
 fflush(stdin);
 scanf("%lf",&hu[A].cunkuan);
 
 fprintf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[A].idnum,hu[A].name,hu[A].idnumber,hu[A].password,hu[A].cunkuan);
 A++;
 printf("Would you like to continue? (y)/No(n)?");
 fflush(stdin);
 scanf("%c",&ch); 
 }while(ch=='y'||ch=='Y');
 printf("Deposit successful!\n");
// system("pause");
 system("cls");
 fclose(nchuhu);
 fclose(fchuhu);
}
//********************************************************************************************************************
//Validate deposit slip number or password 
int yanzheng(){
 FILE *fchuhu=fopen("chuh.txt","r");
 int count=0;
 char id[9];
 for(i=0;i<=100;i++){ 
  fscanf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[i].idnum,&hu[i].name,&hu[i].idnumber,&hu[i].password,&hu[i].cunkuan);
 }
 do{
  system("cls");
       printf("\n\n\n\t\t$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$\n");
    printf("\t\t|#|                                                          |#|\n");
    printf("\t\t|#|                    ☆☆☆☆☆☆☆☆☆☆                  |#|\n");
    printf("\t\t|#|                    ☆                ☆                  |#|\n");
    printf("\t\t|#|             ☆   Deposit slip number or password error will return automatically   ☆         |#|\n");
    printf("\t\t|#|                    ☆                ☆                  |#|\n");
    printf("\t\t|#|                    ☆☆☆☆☆☆☆☆☆☆                  |#|\n");
    printf("\t\t|#|                                                          |#|\n");
    printf("\t\t$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$\n");
  printf("\n\n\n\t\t      Please enter your deposit slip number:  ");
  scanf("%s",&id);
  printf("\n\n\n\t\t      Please enter your password:  ");
  for(i=0;i<6;i++){ 
   fflush(stdin);
  password[i]=getch();
   printf("*");
  } 
  password[6]='\0';
  fflush(stdin);
  scanf("c",&ch);
  printf("\n\n\t\t");
  for(i=0;i<99;i++){ 
   if(strcmp(id,hu[i].idnum)==0&&strcmp(password,hu[i].password)==0){
    fclose(fchuhu);
    return 0;
   }
  }
  
 }while(count==0);
 fclose(fchuhu);
 return count;
}
//********************************************************************************************************************
//Deposit
void cunkaun(){
 FILE *fchuhu=fopen("chuh.txt","r");
 FILE *achuhu=fopen("back.txt","w");
 char id[9];int i;
 if(!fchuhu) printf("Cannot open file:");
 if(!achuhu) printf("Cannot create file");
 for(i=0;i<=100;i++){ 
 fscanf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[i].idnum,&hu[i].name,&hu[i].idnumber,&hu[i].password,&hu[i].cunkuan);
 } //
 int x=0;
  date();
  printf("\n\n\t\t##Please re-enter and confirm the deposit slip:");
  scanf("%s",&id);
  for(i=0;i<=100;i++){ 
   if(strcmp(id,hu[i].idnum)==0){  
     printf("\n\n"); 
    printf("\t\t||================================================================||\n");
    printf("\t\t||                           *Deposit Amount*                           ||\n");
    printf("\t\t||================================================================||\n");
    printf("\t\t||                                                                ||\n");
    printf("\t\t||                                                                ||\n");
      printf("\t\t||         1、200        2、400        3、600        4、800       ||\n");
    printf("\t\t||                                                                ||\n");
    printf("\t\t||                                                                ||\n");
      printf("\t\t||         5、1000        6、2000        7、4000        8、6000   ||\n");
    printf("\t\t||                                                                ||\n");
    printf("\t\t||================================================================||\n");
    printf("\t\t||================================================================||\n");
    printf("\n\n\t\t\tPlease enter your withdrawal amount:");
    scanf("%d",&a);
    switch(a){
     case 1:{jin=200;
       printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^"); 
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 2:{jin=400;
         printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^");  
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 3:{
      jin=600;
       printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^");  
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 4:{
       jin=800;
      printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^"); 
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
          case 5:{jin=1000;
      printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^"); 
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 6:{jin=2000;
      printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^"); 
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 7:{
      jin=4000;
      printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^"); 
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 8:{
       jin=6000;
       printf("\t\t\tDeposited %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Deposit successful^^^^"); 
        hu[i].cunkuan+=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     default:printf("\n\n\n\t\t\tYour selected amount is not within the service range!!!\n\n\n\t\t\tPlease re-select the service:"); 
     
    }   
    fclose(fchuhu);
             fclose(achuhu);
             system("del chuh.txt");
               rename("back.txt","chuh.txt");//rename(old, new） 
                break;  
    }
    }
   }

//*******************************************************************************************************************
//Withdrawal 
void qukaun(){
 FILE *fchuhu=fopen("chuh.txt","r");
 FILE *achuhu=fopen("back.txt","w");
 int i;
 char id[9];
 if(!fchuhu) printf("Cannot open file:");
 if(!achuhu) printf("Cannot create new file:");
 for(i=0;i<=100;i++){ 
 fscanf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[i].idnum,&hu[i].name,&hu[i].idnumber,&hu[i].password,&hu[i].cunkuan);
 }

   date();
   printf("\n\n\t\tPlease re-enter and confirm the deposit slip:");
   scanf("%s",&id);
   for(i=0;i<=99;i++){ 
    if(strcmp(id,hu[i].idnum)==0){
       printf("\n\n"); 
       printf("\t\t||================================================================||\n");
    printf("\t\t||                           *Withdrawal Amount*                           ||\n");
    printf("\t\t||================================================================||\n");
    printf("\t\t||                                                                ||\n");
    printf("\t\t||                                                                ||\n");
      printf("\t\t||         1、200        2、400        3、600        4、800       ||\n");
    printf("\t\t||                                                                ||\n");
    printf("\t\t||                                                                ||\n");
      printf("\t\t||         5、1000        6、2000        7、4000        8、6000   ||\n");
    printf("\t\t||                                                                ||\n");
    printf("\t\t||================================================================||\n");
    printf("\t\t||================================================================||\n");
    printf("\n\n\t\t\tPlease enter your withdrawal amount:");
    scanf("%d",&a);
    switch(a){
     case 1:{jin=200;
      printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 2:{jin=400;
      printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 3:{jin=600;
     printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 4:{
       jin=800;
     printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
          case 5:{jin=1000;
     printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 6:{jin=2000;
     printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 7:{jin=4000;
     printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     case 8:{jin=6000;
     printf("\t\t\tWithdrew %lf yuan",jin);
         printf("\n\n\n\t\t\t^^^^Withdrawal successful^^^^"); 
        hu[i].cunkuan-=jin;
        printf("\n\n\t\t\t$Your balance is: %lf",hu[i].cunkuan);
        fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
     break;
     }
     default:printf("\n\n\n\t\t\tYour selected amount is not within the service range!!!\n\n\n\t\t\tPlease re-select the service:"); 
     
    }
    fclose(fchuhu);
              fclose(achuhu);
              system("del chuh.txt");
              rename("back.txt","chuh.txt");
    break;
    }

   }

}
//********************************************************************************************************************
//Transfer
void zhuan(){
 FILE *fchuhu=fopen("chuh.txt","r+");
 int i;
 char id[9];
 if(!fchuhu) printf("Cannot open file:");

 for(i=0;i<=100;i++){ 
 fscanf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[i].idnum,&hu[i].name,&hu[i].idnumber,&hu[i].password,&hu[i].cunkuan);
 }

   date();
   printf("\n\n\t\tPlease enter the deposit slip number of the transferor:");
   scanf("%s",&id);
   for(i=0;i<=99;i++){ 
    if(strcmp(id,hu[i].idnum)==0){
         printf("\n\n\t\tPlease enter the amount to be transferred:");
      scanf("%lf",&jin);
      printf("\n\n\t\tPlease confirm the amount: %lf",jin); 
     hu[i].cunkuan+=jin;
     printf("\n\n\nTransfer successful"); 
      fprintf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[A].idnum,hu[A].name,hu[A].idnumber,hu[A].password,hu[A].cunkuan);
       fclose(fchuhu);
 fclose(fchuhu);

     break;
    }

   }

 
} 
//********************************************************************************************************************
//********************************************************************************************************************
void xiugai(){
 FILE *fchuhu=fopen("chuh.txt","r");
 FILE *achuhu=fopen("back.txt","w");
 int j,i;
 char id[9];
 if(!fchuhu) printf("Cannot open file:");
 if(!achuhu) printf("Cannot create new file:");
 for(i=0;i<=100;i++){ 
 fscanf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[i].idnum,&hu[i].name,&hu[i].idnumber,&hu[i].password,&hu[i].cunkuan);
 }

   date();
   printf("\n\n\t\tPlease re-enter and confirm the deposit slip:");
   scanf("%s",&id);
   for(i=0;i<=99;i++){ 
    if(strcmp(id,hu[i].idnum)==0){
    printf("Please enter a new password:\n");
     printf("\n\t\tDepositor's password (6 digits):");
 for(j=0;j<6;j++){ 
  fflush(stdin);
  hu[i].password[j]=getch();
  printf("*");

 } 
     printf("\n\n\t\tNew password: %s\n",hu[i].password);
    
     printf("\n\n\t\tModification successful"); 
      fprintf(achuhu,"%s\t%s\t%s\t%s\t%lf\n",hu[A].idnum,hu[A].name,hu[A].idnumber,hu[A].password,hu[A].cunkuan);
       fclose(fchuhu);
 fclose(achuhu);
 system("del chuh.txt");
 rename("back.txt","chuh.txt");
     break;
    }

   }

}

//&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&//Query information 
void display(){
 FILE *fchuhu=fopen("chuh.txt","r");
 int i,n=0;
 char fnumb[9];
 system("cls");
 for(i=0;i<=100;i++){ 
   fscanf(fchuhu,"%s\t%s\t%s\t%s\t%lf\n",&hu[i].idnum,&hu[i].name,&hu[i].idnumber,&hu[i].password,&hu[i].cunkuan);
 }
 
 printf("\n\n●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●\n");
 printf("\n\n              ●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●                      \n");
 printf("\n\n                              ●●●●●●●●●●●●●●●●●●●●●●●●●●                                              \n");
 printf("\n\n\t\t\t\tPlease enter your deposit slip number:");
 scanf("%s",&fnumb);
 printf("\n\n\n");
 printf("\t\t\t\tYour personal information is as follows:");
 printf("\n\n");
 for(i=0;i<=99;i++)
  if(strcmp(fnumb,hu[i].idnum)==0){
    printf("Deposit slip number: %s\tName: %s\tID card: %s\tPassword: %s\tDeposit amount: %lf\n",hu[i].idnum,hu[i].name,hu[i].idnumber,hu[i].password,hu[i].cunkuan);
    n=1;
    fclose(fchuhu);
    system("pause"); 
             break; 
  }
if(n==0) printf("This account does not exist!!!\n");
fclose(fchuhu);

}

//********************************************************************************************************************
void date(){//Display current date
printf("Current date:");
system("date/t");
printf("Current time:");
system("time/t"); 
}

Business Process

1. User Account Opening

2. Login Process

3. Password Modification

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