Decimal-Binary and Decimal-Hexadecimal Conversion

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<math.h>
#include<string.h>
#define max 10

 class number
  {
   private :
     int dec;
     long bin;
     char hdec[max];
   public  :
     void indec()
      {
       cout<<"Enter any decimal number :- ";
       cin>>dec;
      }

     void dec2bin()
      {
       int i = 0,n,dec2 ;
       bin = 0;
       dec2 = dec;
       while(dec2)
{
n = dec2 % 2;
bin += n*pow(10,i);
i++;
dec2 /= 2;
}
       cout<<"\n\n\t Its binary equivalent is :-"<<bin;
      }

     void dec2hxdc()
      {
       int i=0,n;
       while(dec != 0 )
{
n = dec%16;
if(n==10)   hdec[i] = 'A';
else if(n==11)    hdec[i] = 'B';
else if(n==12)    hdec[i] = 'C';
else if(n==13)    hdec[i] = 'D';
else if(n==14)    hdec[i] = 'E';
else if(n==15)    hdec[i] = 'F';
else           hdec[i] = n+48 ;
i++;
dec /= 16;
}
hdec[i]='\0';
strrev(hdec);
cout<<"\n\n\t n Its hexadecimal equivalent is :- ";
puts(hdec);
      }

     };

 void main()
 {
  clrscr();
  number nm;
  nm.indec();
  nm.dec2bin();
  nm.dec2hxdc();
  getch();
 }