Project of Bank Management System in C language

#include<stdio.h>

#include<dos.h>

#include<conio.h>

#include<string.h>

#include<graphics.h>

#include<process.h>

struct bank // Bank Structure

{int accno;

char name[20];

float bal;

}b;

void main()

{int ch;

clrscr();

b:printf("\n\t\t\t\t Welcome to Aarthi Banking Corporation \n\n\n\t Please select your appropriate option...");

printf("\n 1. New customer \n 2. Existing customer \n 3. Exit");

scanf("%d",&ch);

switch (ch)

{  case 1:

                     {FILE*ff;

                     ff=fopen("customer.dat","a");

                     clrscr();

                     printf("\n Welcome to Aarthi Banking Corporation (ABC.Ltd).\n It is a pleasure to have you here \n Please enter your name without spaces  :");

                     scanf("%s",&b.name);

                     clrscr();

                     printf("\n Welcome %s, please enter a suitable  account number",b.name);

                     scanf("%d",&b.accno);

                     printf("\n Please mention the initial deposit... Rs: ");

                     scanf("%f",&b.bal);

                     printf("\n Congratulations... Your account has been created.\nTo deposit please login as existing customer");

                     fwrite(&b,sizeof(b),1,ff);

                     fclose(ff);

                     getch();

                     clrscr();

                     goto b;

                     }break;

case 2:

                     { int num,count=0,n,ch,flag;

  int a,c,t;

  float amount,value,temp;

  FILE *fp;

   clrscr();

   printf("\n Welcome once again to Aarthi Banking Corporation (ABC)... ");

   printf("\n\n Please Enter your Account Number");

   scanf("%d",&num);

   fp=fopen("customer.dat","r+");

   rewind(fp);

   while(!feof(fp)&&count==0)

  {  fread(&b,sizeof(b),1,fp);

   if (b.accno==num)

   {    count=1;   }     }

   if(count==0)

   {         printf("\n Wrong account number... No such user");

   getch();

   goto b;   }

 else

    { int m;

    clrscr();

    printf("\n Welcome %s, What service would you like to avail",b.name);

    printf("\n 1. Deposit Amount ");

    printf("\n 2. Withdraw Amount ");

    printf("\n 3. View Details ");

    printf("\n 4. Foreign Exchange");

    printf("\n 5. Exit program");

    printf("\n Please Enter your choice : ");

    scanf ("%d",&m);

    switch(m)

    {case 1:

    {clrscr();

     printf("\n\n\n Dear %s, please enter the amount you wish to deposit : ",b.name);

     scanf("%f",& amount);

     b.bal=b.bal+amount;

     printf("\n Your current available bank balance is %f", b.bal);

     n=sizeof(b);

     fseek(fp,-n,SEEK_CUR);

     fwrite(&b,n,1,fp);

     fclose(fp);

     getch();

     }break;

     case 2:

    {clrscr();

     printf("\n\n\n Dear %s, please enter the amount you wish to withdraw : ",b.name);

     scanf("%f",& amount);

     if(b.bal-amount<=0)

     {printf("\n Sorry, You dont have enough money in your account");

     fclose(fp);

     getch();

     goto b;

     }

     else

     {b.bal=b.bal-amount;

     printf("\n Your current available bank balance is %f", b.bal);

     getch();

     n=sizeof(b);

     fseek(fp,-n,SEEK_CUR);

     fwrite(&b,n,1,fp);

     fclose(fp);

     goto b;

     }

     }break;

     case 3:

     { clrscr();

      printf("\n Your Account Details are as folows...");

      printf("\n\n Name : %s",b.name);

      printf("\n\n Account Number : %d ",b.accno);

      printf("\n\n Available Balance :%f ",b.bal);

      fclose(fp);

     printf("\n Press any key to continue...");

     getch();      clrscr();

     goto b;

     }break;

     case 4:

     {int x;

     float y,z;

     clrscr();

      printf("\n Welcome to the foreign exchange convertor section \n Select the currency you wish to convert.");

      printf("\n 1. US Dollar");

      printf("\n 2. Euro");

      printf("\n 3. Pound");

      scanf("%d",&x);

      switch(x)

      {

      case 1:

      {      printf("\n Please enter the amount of rupees you wish to convert");

      scanf("%f",&y);

      z=45/y;

      printf("\n The converted rate is $ %f",z);

      getch();

      goto b;

      }break;

      case 2:

      {      printf("\n Please enter the amount of rupees you wish to convert");

      scanf("%f",&y);

      z=75/y;

      printf("\n The converted rate is euro %f",z);

      getch();

      goto b;

      }break;

      case 3:

      {printf("\n Please enter the amount of rupees you wish to convert");

      scanf("%f",&y);

      z=60/y;

      printf("\n The converted rate is pound %f",z);

      getch();

      goto b;

      }break;

     default:

     exit(0);

    }    }break;}}}}}