program mengkonversi desimal ke hexa, biner dan oktal pada c++

#include <iostream.h>
main{
int ;
cout<<"Program Konversi Bilangan\n\n";
cout<<"Masukkan bilangan desimal : ";
cin>>input;
dectohex(input);
dectobin(input);
dectooc(input);
getch();
}

void dectobin(int input)
{     
cout << input <<" dalam Biner adalah ";
for(int x=0; x<input;)
{
++counter;
c[counter] = input % 2;
input = input / 2;
}
while(counter>0)
{
cout << c[counter];
--counter;
}
cout<<"\n";
}

void dectohex(int input)
{
cout << input <<" dalam Hexadesimal adalah ";
for(int x=0; x<input;)
{
++counter;
c[counter] = input % 16;
input = input / 16;
}

while(counter>0)
{
if(c[counter]==15)
{
cout<<"F";       
}
else if(c[counter]==14)
{
cout<<"E";
}
else if(c[counter]==13)
{
cout<<"D";
}
else if(c[counter]==12)
{
cout<<"C";
}
else if(c[counter]==11)
{
cout<<"B";
}
else if(c[counter]==10)
{
cout<<"A";
}
else
{
cout<<c[counter];
}
--counter;
}
cout<<"\n";
}

void dectooc(int input)
{     
cout << input <<" dalam Oktal adalah ";
for(int x=0; x<input;)
{
++counter;
c[counter] = input % 8;
input = input / 8;
}
while(counter>0)
{
cout << c[counter];
--counter;
}
cout<<"\n";
}