angka dan kata angka

#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<=19)){
        terbilang(b%10);
        cout<<"Belas ";
    }else if ((b>=20)&&(b<=99)) {
        terbilang(b/10);
        cout<<"Puluh";
        terbilang(b%10);
    }else if ((b>=100)&&(b<=199)) {
        cout<<"Seratus";
        terbilang(b%100);
    }else if ((b>=200)&&(b<=999)) {
        terbilang(b/100);
        cout<<"Ratus";
        terbilang(b%100);
    }else if ((b>=1000)&&(b<=1999)) {
        cout<<"Seribu";
        terbilang(b%1000);
    }else if ((b>=2000)&&(b<=9999)) {
        terbilang(b/1000);
        cout<<"Ribu";
        terbilang(b%1000);
    }else if ((b>=10000)&&(b<=99999)) {
        terbilang(b/1000);
        cout<<"Ribu";
        terbilang(b%1000);
    }else if ((b>=100000)&&(b<=999999)) {
        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 aplikasi";
    }
}
int main()
{
    int nilai;
    string angka;
    cout<<"Masukkan Bilangan Anda: ";
    cin>>nilai;
        int i=1;
        while(i<=nilai){
            cout << i;
            terbilang(i);
            cout << endl;
            i++;
        }
    cout<<"\n============================\n";
    return 0;
}