Konversi Bilangan [1 - 1 juta]

#include <iostream>
#include <cmath>

using namespace std;



void satuan (int a)
{
if (a==1)
{
cout<<" Satu ";
}
else if (a==2)
{
cout<<" Dua ";
}
else if (a==3)
{
cout<<" Tiga ";
}
else if (a==4)
{
cout<<" Empat ";
}
else if (a==5)
{
cout<<" Lima ";
}
else if (a==6)
{
cout<<" Enam ";
}
else if (a==7)
{
cout<<" Tujuh ";
}
else if (a==8)
{
cout<<" Delapan ";
}
else if (a==9)
{
cout<<" Sembilan ";
}
else if (a==10)
{
cout<<" Sepuluh ";
}
else if (a==11)
{
cout<<" Sebelas ";
}
}
void terbilang (int b)
{
if (b<=11)
{
satuan(b);
}
else if ((b>11) && (b<20))
{
terbilang(b%10);
cout<<"Belas ";
}
else if ((b>=20)&&(b<100))
{
terbilang(b/10);
cout<<"Puluh";
terbilang(b%10);
}
else if ((b>=100)&&(b<200))
{
cout<<"Seratus";
terbilang(b%100);
}
else if ((b>=200)&&(b<1000))
{
terbilang(b/100);
cout<<"Ratus";
terbilang(b%100);
}
else if ((b>=1000)&&(b<2000))
{
cout<<"Seribu ";
terbilang(b%1000);
}
else if ((b>=2000)&&(b<10000))
{
terbilang(b/1000);
cout<<"Ribu";
terbilang(b%1000);
}
else if ((b>=10000)&&(b<100000))
{
terbilang(b/1000);
cout<<"Ribu";
terbilang(b%1000);
}
else if ((b>=100000)&&(b<1000000))
{
terbilang(b/1000);
cout<<"Ribu";
terbilang(b%1000);
}
else if ((b==1000000))
{
terbilang(b/1000000);
cout<<"Juta";
terbilang(b%1000000);
}
else if ((b>1000000))
{
cout<<"ERROR\n";
cout<<"nilai yang Anda masukan melampaui database, Sorry ya, codingnya udah banyak nih :D";
}
}

int main()
{
int nilai;

cout<<"============================\n";
cout<<"     KONVERSI BILANGAN \n";
cout<<"============================\n";
cout<<"Masukkan Bilangan Yang Ingin Anda Konversi [1 - 1000000]: ";

cin>>nilai;
if (nilai<0){
cout<<"Minus";
terbilang(abs(nilai));
} else {
terbilang(nilai);
}

return 0;
}