نوشتن عدد به حروف (البته تا سه رقم)

# include <stdio.h>
# include <conio.h>
# include <iostream.h>
int main ()
{
 int n,yekan=0,dahgan=0,sadgan=0;
 cout <<"nn     Lotfan yek adad vared konid:   ";
 cin >> n;
 if(n>999)
 {cout<<"nn    Adad vorodi bozorgtar az adad se raghamist!";
 getch ();
 return 0;
 }
 if (n==0)cout<<"nn                   sefr ";
 yekan=n%10;
 n=n/10;
 dahgan=n%10;
 n=n/10;
 sadgan=n%10;
 switch (sadgan){
    case 1:{cout<<"nn            sad   ";break;}
    case 2:{cout<<"nn            devist   ";break;}
    case 3:{cout<<"nn            sisad   ";break;}
    case 4:{cout<<"nn            chaharsad   ";break;}
    case 5:{cout<<"nn            pansad   ";break;}
    case 6:{cout<<"nn            seshsad   ";break;}
    case 7:{cout<<"nn            haftsad   ";break;}
    case 8:{cout<<"nn            hashtsad   ";break;}
    case 9:{cout<<"nn            nohsad   ";break;}}
 if (sadgan==0)
     cout << "nn            ";
 if ( dahgan != 0 && sadgan!=0)
 cout <<"o ";
 switch (dahgan){
    case 2:{cout<<" bist  ";break;}
    case 3:{cout<<" si  ";break;}
    case 4:{cout<<" chehel  ";break;}
    case 5:{cout<<" pangah  ";break;}
    case 6:{cout<<" shast  ";break;}
    case 7:{cout<<" haftad  ";break;}
    case 8:{cout<<" hashtad  ";break;}
    case 9:{cout<<" navad  ";break;}
    case 1:
        switch (yekan){
            case 0:{cout<<" dah ";break;}
            case 1:{cout<<" yazdah ";break;}
            case 2:{cout<<" davazdah ";break;}
            case 3:{cout<<" sizdah ";break;}
            case 4:{cout<<" chahardah ";break;}
            case 5:{cout<<" panzdah ";break;}
            case 6:{cout<<" shanzdah ";break;}
            case 7:{cout<<" ehfdah ";break;}
            case 8:{cout<<" ehjdah ";break;}
            case 9:{cout<<" nozdah ";break;}}}
 if ((dahgan >0 && dahgan!=1 && yekan !=0) || ( sadgan > 0 && yekan!=0 && dahgan!=1))
 cout <<"o ";
 if(dahgan!=1){
 switch (yekan){
    case 1:{cout<<" yek ";break;}
    case 2:{cout<<" do ";break;}
    case 3:{cout<<" se ";break;}
    case 4:{cout<<" chahar ";break;}
    case 5:{cout<<" pang ";break;}
    case 6:{cout<<" shesh ";break;}
    case 7:{cout<<" haft ";break;}
    case 8:{cout<<" hasht ";break;}
    case 9:{cout<<" noh ";break;}}}
 getch();
 return 0;
}