tubes

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>

struct user
{
    char nama[15];
    char pass[15];
}data[100],login,regi;

void bersih()
{
    system("cls");
}

void regis()
{
    FILE *fp;
    char cek[15],c,cek_nama[15],cek_pass[15];
    int n=0,i=0;
    fp=fopen("Data.txt","a+");
    printf("\t\t==============\n");
    printf("\t\t* REGISTRASI *\n");
    printf("\t\t==============\n");
    printf("\n\n");
    printf("MASUKKAN USERNAME: ");
    scanf("%s",regi.nama);
    while(!feof(fp)){
        fscanf(fp,"%s %s\n",&cek_nama,&cek_pass);
        if(strcmp(cek_nama,regi.nama)==0){
            printf("USERNAME TIDAK TERSEDIA\n");
            printf("COBA LAGI\n");
            system("pause");
            bersih();
            regis();
        }else{
            strcpy(regi.nama,cek_nama);
            break;
        }
    }
    printf("MASUKKAN PASSWORD: ");
    while (n<=15){
      regi.pass[n]=getch();
      c=regi.pass[n];
      if(c==13) break;
      else printf("*");
      n++;
  }
    fprintf(fp,"%s %s\n",regi.nama,regi.pass);
    fclose(fp);
    for(i=0;i<=n;i++)
        strcpy(regi.pass,"\0");
    bersih();
    printf("%s\n",regi.pass);
    printf("REGISTRASI BERHASIL\n");
}

void in()
{

}
int main()
{
    regis();
    return 0;
}