Bublle Sort (Inputed)

Berikut ini saya share Bubble sort dengan cara menginputkan, silahkan dibaca dan dikoment ya

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<iomanip.h>
main()
{
   char npm[3][10];
   char nama[3][30];
   char kelas[3][5];
   char ipk[3][5];
   int tukar;
   char temp[3];
   int i;
   clrscr();

   cout<<"DATA MAHASISWA KELAS 2-C\n";
   for (i=0; i<=2; i++)
   {
       cout<<endl;
      cout<<"Inputkan NPM    = "; gets (npm[i]);
      cout<<"Inputkan Nama   = "; gets(nama[i]);
      cout<<"Inputkan Kelas  = "; gets(kelas[i]);
      cout<<"Inputkan IPK    = "; cin>>ipk[i];
   }
   clrscr();
   cout<<"\n\n             DATA MAHASISWA SEBELUM DIURUTKAN :\n";
   cout<<endl;

   cout<<"================================================================\n";
   cout<<"    NPM         |       Nama            |    Kelas      |  IPK  |\n";
   cout<<"================================================================\n\n";

   for (i=0; i<=2; i++)
   {
      cout<<setw(1)<<npm[i]<<"    |"<<setw(16)<<nama[i]<<"    |"<<setw(9)
      <<kelas[i]<<"    |"<<setw(6)<<ipk[i]<<" |"<<endl;
   }
   cout<<"================================================================\n\n";

   tukar=1;
   while(tukar==1)
   {
      tukar=0;
      for(i=0; i<=3-1; i++)
      {
         if(strcmp(ipk[i],ipk[i+1])<0)
         {
           strcpy(temp,ipk[i]);
           strcpy(ipk[i],ipk[i+1]);
           strcpy(ipk[i+1],temp);
           strcpy(temp,nama[i]);
           strcpy(nama[i],nama[i+1]);
           strcpy(nama[i+1],temp);
           strcpy(temp,kelas[i]);
           strcpy(kelas[i],kelas[i+1]);
           strcpy(kelas[i+1],temp);
           strcpy(temp,npm[i]);
           strcpy(npm[i],npm[i+1]);
           strcpy(npm[i+1],temp);
           tukar=1;
         }
      }
   }
   cout<<"\n\n          DATA MAHASISWA SETELAH DIURUTKAN :\n";
   cout<<endl;

   cout<<"================================================================\n";
      cout<<"    NPM         |       Nama            |    Kelas      |  IPK  |\n";
   cout<<"================================================================\n\n";
   for(i=0; i<=2; i++)
   {
        cout<<setw(1)<<npm[i]<<"    |"<<setw(16)<<nama[i]<<"    |"<<setw(9)
      <<kelas[i]<<"    |"<<setw(6)<<ipk[i]<<" |"<<endl;
   }
   cout<<"================================================================\n\n";
  
   getch();
}