Hi Everyone!!

I'm facing a few problems in storing the structutres or records in a file.
I'm trying to store the usernames and passwords(Taken as example), of a person in a single record as structure variable w[99]. and **i=0 to i<=100
***
When the program Executes for the first time, the username and password of a person are stored in rec[0] record... But when I close everything and restart the program, again it starts from w[0], which results in merging of all records..

and since all data is in a single record, if any of the username and passwords match the existing record, the program logs in. Whichmust not happen..

**Needed sugesstions.. **

code:

#include<conio.h>
#include<stdio.h>
#include<string.h>
int i=0;
struct web
{
char name[30],pass[30];
}w[99];
int n;
void login(void);
void reg(void);
int main()
{
 clrscr();
 printf("\n\n\n\n\n\t\t\t\tWELCOME TO MY WEBSITE");
 printf("\n\t\t\t\t=====================");
 printf("\n\n\n\n\t\t\tPress Enter to proceed...!!");
 if(getch()==13)
  clrscr();
 printf("\n\n\n\t\t\t1. LOGIN\t\t2. REGISTER");
 printf("\n\n\n\t\t\t\tENTER YOUR CHOICE: ");
 scanf("%d",&n);
 switch(n)
  {
    case 1: clrscr();
         login();

    case 2: clrscr();
         reg();
    default: printf("NO MATCH FOUND");
         return 0;

  }
}
 void reg()
  {
     FILE *fp;
     char c,checker[30]; int z=0;
     fp=fopen("Web_reg.txt","ab+");
     printf("\n\n\t\t\t\tWELCOME TO REGISTER ZONE");
     printf("\n\t\t\t\t^^^^^^^^^^^^^^^^^^^^^^^^");
     for(i=0;i<1000;i++)
     {
      printf("\n\n\t\t\t\t   ENTER USERNAME: ");
      scanf("%s",checker);
        while(!feof(fp))
         {
          fread(&w[i],sizeof(w[i]),1,fp);
          if(strcmp(checker,w[i].name)==0)
            {
             printf("\n\n\t\t\tUSERNAME ALREDY EXISTS");
             clrscr();
             reg();
            }
          else
          {
            strcpy(w[i].name,checker);
            break;
          }
         }
      printf("\n\n\t\t\t\t   DESIRED PASSWORD: ");
      while((c=getch())!=13)
         {
          w[i].pass[z++]=c;
          printf("%c",'*');
         }
      fwrite(&w[i],sizeof(w[i]),1,fp);
      fclose(fp);
      printf("\n\n\tPress enter if you agree with Username and Password");
      if((c=getch())==13)
        {
         clrscr();
         printf("\n\n\t\tYou are successfully registered");
         printf("\n\n\t\tTry login your account??\n\n\t\t  ");
         printf("> PRESS 1 FOR YES\n\n\t\t  > PRESS 2 FOR NO\n\n\t\t\t\t");
         scanf("%d",&n);
         switch(n)
          {
              case 1: clrscr();
                    login();
                    break;
              case 2: clrscr();
                    printf("\n\n\n\t\t\t\t\tTHANK YOU FOR REGISTERING");
                    break;
          }

        }
        break;
      }
     getch();
  }

  void login()
    {
      FILE *fp;
      char c,name[30],pass[30]; int z=0;
      int checku,checkp;
      fp=fopen("Web_reg.txt","rb");
      printf("\n\n\t\t\t\tWELCOME TO LOG IN ZONE");
      printf("\n\t\t\t\t^^^^^^^^^^^^^^^^^^^^^^");
      for(i=0;i<1000;i++)
      {
        printf("\n\n\t\t\t\t   ENTER USERNAME: ");
        scanf("%s",name);
        printf("\n\n\t\t\t\t   ENTER PASSWORD: ");
        while((c=getch())!=13)
         {
          pass[z++]=c;
          printf("%c",'*');
         }
        pass[z]='\0';
      while(!feof(fp))
        {
         fread(&w[i],sizeof(w[i]),1,fp);
          checku=strcmp(name,w[i].name);
          checkp=strcmp(pass,w[i].pass);
          if(checku==0&&checkp==0)
          {
            clrscr();
            printf("\n\n\n\t\t\tYOU HAVE LOGGED IN SUCCESSFULLY!!");
            printf("\n\n\n\t\t\t\tWELCOME, HAVE A NICE DAY");
            break;
          }
         else if(checku==0&&checkp!=0)
          {
            printf("\n\n\n\t\t\tWRONG PASSWORD!! Not %s??",name);
            printf("\n\n\t\t\t\t  (Press 'Y' to re-login)");
             if(getch()=='y'||getch()=='Y')
              login();
          }
         else if(checku!=0&&checkp!=0)
          {
            printf("\n\n\n\t\t\tYou are not a Registered User\n \t\t\tPress enter to register yourself");
            if(getch()==13)
             reg();
          }

        }
        break;
      }
      getch();

    }
 for(i=0;i<1000;i++)

What is the use of this loop.? First clear you logic what you want to do and then start your coding.
and 1 tips fom my side that opening file mode instead of "wb+"..use "w".
You always start you loop from i=0; why not you decalare a global variable which represent the number of record in your file and start from the next to that.

You need to put break statement on lines 27 and 30 so that if you select Login the program won't make you register also.

and 1 tips fom my side that opening file mode instead of "wb+"..use "w".

No. "wb+" is correct in this program because the structures are being written in binary mode using fwrite().at line 67.

@fox3 wb+ is the best mode for writing structs., as ancient dragon said.

@Ancient Dragon
that is ok!! i'l write break there, but each time when i run the program, the i value will be reinitialized to zero, so again the records will be merged isn't it?
what if i take i as static??? will that solve the problem?