UTS c++

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <iostream.h>
#include <cstring.h>

luk(float h)
{
float disk;
    if(h < 1000000)
      disk= (h * 10) / 100;
   else if(h >= 1000000 && h <= 5000000)
      disk = (h * 20) / 100;
   else if(h > 5000000)
      disk = (h * 25) / 100;

     return disk;
}
main(){
    float diskon[100],h[100],hb[100],hj[100],total,bayar,kembali;
   int r = 0, index = 0, i = 0;
   char  b[100][20],tmp[10];

   while(r != 3){
      clrscr();

       cout<<"                                                            \n";
      cout<<"                                     UTS                     \n";
        cout<<"                             PROGRAM DATA BARANG             \n";
        cout<<"                 ------------------------------------------\n";
       cout<<"                       LUQMAN SYAIFUL A.  10201417     \n";
       cout<<"================================================================================\n\n";
      cout<<" MENU:\n";
      cout<<"------------------\n\n";
      cout<<" 1. Input Data\n 2. Cetak Laporan\n 3. Exit\n\nMasukkan Pilihan[1/2/3]: ";gets(tmp);r = atoi(tmp);
      //atoi =str-int
      //atof=str-float

      switch(r){
          case 1:
         char lagi; lagi='p';
         while (lagi!='t')
           {    clrscr();

             cout<<" -----------(Input Data)----------\n";
            //cout<<"-----------------------------------\n";
             cout<<" Nama Barang: "; gets(b[i]);
            cout<<" Harga      : "; gets(tmp);
            h[i] = atof(tmp);
            diskon[i]=luk(h[i]);
            hj[i]=h[i]-diskon[i];
            //ds[i]=x(h[i]);
            cout<<endl<< diskon[i] <<endl;
            i++;

           cout<<"Apakah akan mengisi lagi?(y/t): "; lagi=getch();
           }
               break;  //keluar
         case 2:

    //            int k = 4;
   //         while(k != 0 && k != 3)
               //{
            kembali=-1;
                 while (kembali <0 )
            {
            clrscr();


            printf("--------------------------------------------------------------\n");
            printf("|Nama barang|   |Harga beli|    |Diskon|        |Harga jual|\n");
            printf("==============================================================\n");
            total=0;

            for(index = 0; index < i; index++)
                 {
                  gotoxy(4,4+index),printf("%s", b[index]);
                  gotoxy(18,4+index),printf("%0.2f",h[index]);
                  gotoxy(32,4+index),printf("%0.2f",diskon[index]);

                  if (diskon[index]<1000000)
                  gotoxy(42,4+index),printf("(10%)");
                  else if (diskon[index]>=1000000 ||diskon[index]<= 5000000 )
                   gotoxy(42,4+index),printf("(20%)");
                  else if(diskon[index]>5000000 )
                  gotoxy(42,4+index),printf("(25%)") ;
                 gotoxy(50,4+index),printf("%0.2f",hj[index]);
                  total=total+hj[index];
                 }

           printf("\n--------------------------------------------------------------------------------\n");
           gotoxy(50,6+index),printf("%0.2f",total);
           gotoxy(30,6+index),printf("Total bayar");




           gotoxy(30,8+index),printf("Uang tunai");
           gotoxy(50,8+index),gets(tmp);

           bayar=atof(tmp);
           kembali=bayar-total;

     //       kembali=-1;
     //              while (kembali <0 )
     //       {

           }

       gotoxy(30,9+index),printf("Kembali");
       gotoxy(50,9+index),printf("%0.2f",kembali);
       gets(tmp);
      }

   }
 //  getch();
}

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