Information Technology

#include<stdio.h>
#include<conio.h>
#include<ctype.h>
#include<windows.h>
#include<stdlib.h>
struct subscriber
{
char phonenumber[20];
char name[50];
float amount;
}s;
void addrecords();
void listrecords();
void modifyrecords();
void deleterecords();
void searchrecords();
void payment();
char get;
int main()
{ int password;
 int phonenumber;
 char choice;



 system("cls");

 printf("\n\n\n\n\n\n\n\n\n**********************************************************************");
 printf("\n\t\t---WELCOME TO THE INSAN BILLING MANAGEMENT SYSTEM---");
 printf("\n\t\t****************************************************************");
 Sleep(2000);
 getch();
    system("cls");
 while (1)
 {
  system("cls");
  printf("\n enter\n A : for adding new records.\n L : for list of records");
  printf("\n M : for modifying records.\n P : for payment");
  printf("\n S : for searching records.");
  printf("\n D : for deleting records.\n E : for exit\n");
  choice=getche();
  choice=toupper(choice);
  switch(choice)
  {
   case 'P':
    payment();break;
   case 'A':
    addrecords();break;
   case 'L':
    listrecords();break;
   case 'M':
    modifyrecords();break;
   case 'S':
    searchrecords();break;
   case 'D':
    deleterecords();break;
   case 'E':
    system("cls");
    printf("\n\n\t\t\t\tTHANK YOU");
    printf("\n\n\n\n\n:\n\tFOR USING OUR SERVICE");
    Sleep(2000);
    exit(0);
    break;
   default:
    system("cls");
    printf("Incorrect Input");
    printf("\nAny key to continue");
    getch();
  }
 }
}
void addrecords()
{
 FILE *f;
 char test;
 f=fopen("c:/file.ojs","ab+");
 if(f==0)
 {   f=fopen("c:/file.ojs","wb+");
  system("cls");
  printf("please wait while we configure your computer");
  printf("/npress any key to continue");
  getch();
 }
 while(1)
 {
  system("cls");
  printf("\n Enter phone number:");
  scanf("%s",&s.phonenumber);
  printf("\n Enter name:");
  fflush(stdin);
  scanf("%[^\n]",&s.name);
  printf("\n Enter amount:");
  scanf("%f",&s.amount);
  fwrite(&s,sizeof(s),1,f);
  fflush(stdin);
  system("cls");
  printf("1 record successfully added");
  printf("\n Press esc key to exit, any other key to add other record:");
  test=getche();
  if(test==27)
   break;
 }
 fclose(f);
}
void listrecords()
{
 FILE *f;
 int i;
 if((f=fopen("c:/file.ojs","rb"))==NULL)
  exit(0);
 system("cls");
 printf("Phone Number\t\tUser Name\t\t\tAmount\n");
 for(i=0;i<79;i++)
  printf("-");
 while(fread(&s,sizeof(s),1,f)==1)
 {
  printf("\n%-10s\t\t%-20s\t\tRs. %.2f /-",s.phonenumber,s.name,s.amount);
 }
 printf("\n");
 for(i=0;i<79;i++)
  printf("-");

fclose(f);
getch();
}
void deleterecords()
{
 FILE *f,*t;
 int i=1;
 char phonenumber[20];
 if((t=fopen("c:/temp.ojs","w+"))==NULL)
 exit(0);
 if((f=fopen("c:/file.ojs","rb"))==NULL)
 exit(0);
 system("cls");
 printf("Enter the phone number to be deleted from the Database");
 fflush(stdin);
 scanf("%[^\n]",phonenumber);
 while(fread(&s,sizeof(s),1,f)==1)
 {
  if(strcmp(s.phonenumber,phonenumber)==0)
  {       i=0;
   continue;

  }
  else
   fwrite(&s,sizeof(s),1,t);
 }
 if(i==1)
 {       system("cls");
  printf("Phone number \"%s\" not found",phonenumber);
  remove("c:/file.ojs");
  rename("c:/temp.ojs","c:/file.ojs");
  getch();
  fclose(f);
  fclose(t);
  main();
 }
 remove("c:/file.ojs");
 rename("c:/temp.ojs","c:/file.ojs");
 system("cls");
 printf("The Number %s Successfully Deleted!!!!",phonenumber);
 fclose(f);
 fclose(t);
 getch();
}
void searchrecords()
{
 FILE *f;
 char phonenumber[20];
 int flag=1;
 f=fopen("c:/file.ojs","rb+");
 if(f==0)
  exit(0);
 fflush(stdin);
 system("cls");
 printf("Enter Phone Number to search in our database");
 scanf("%s", phonenumber);
 while(fread(&s,sizeof(s),1,f)==1)
 {
  if(strcmp(s.phonenumber,phonenumber)==0)
  { system("cls");
   printf(" Record Found ");
   printf("\n\nPhonenumber: %s\nName: %s\nAmount: Rs.%0.2f\n",s.phonenumber,s.name,s.amount);
   flag=0;
   break;
  }
  else if(flag==1)
  { system("cls");
   printf("Requested Phone Number Not found in our database");
  }
 }
 getch();
 fclose(f);
}
void modifyrecords()
{
 FILE *f;
 char phonenumber[20];
 long int size=sizeof(s);
 if((f=fopen("c:/file.ojs","rb+"))==NULL)
  exit(0);
 system("cls");
 printf("Enter phone number of the subscriber to modify:");
 scanf("%[^\n]",phonenumber);
 fflush(stdin);
 while(fread(&s,sizeof(s),1,f)==1)
 {
  if(strcmp(s.phonenumber,phonenumber)==0)
  {
   system("cls");
   printf("\n Enter phone number:");
   scanf("%s",&s.phonenumber);
   printf("\n Enter name: ");
   fflush(stdin);
   scanf("%[^\n]",&s.name);
   printf("\n Enter amount: ");
   scanf("%f",&s.amount);
   fseek(f,-size,SEEK_CUR);
   fwrite(&s,sizeof(s),1,f);
   break;
  }
 }
 fclose(f);
}
void payment()
{
 FILE *f;
 char phonenumber[20];
 long int size=sizeof(s);
 float amt;
 int i;
 if((f=fopen("c:/file.ojs","rb+"))==NULL)
  exit(0);
 system("cls");
 printf("Enter phone number of the subscriber for payment");
 scanf("%[^\n]",phonenumber);
 fflush(stdin);
 while(fread(&s,sizeof(s),1,f)==1)
 {
  if(strcmp(s.phonenumber,phonenumber)==0)
  {
   system("cls");
   printf("\n Phone No.: %s",s.phonenumber);
   printf("\n Name: %s",s.name);
   printf("\n Current amount: %f",s.amount);
   printf("\n");
   for(i=0;i<79;i++)
    printf("-");
   printf("\n\nEnter amount of payment :");
   fflush(stdin);
   scanf(" %f",&amt);
   s.amount=s.amount-amt;
   fseek(f,-size,SEEK_CUR);
   fwrite(&s,sizeof(s),1,f);
   break;
  }
 }
 system("cls");
 printf("THANK YOU %s FOR YOUR TIMELY PAYMENTS",s.name);
 getch();
 fclose(f);
}