menghitung suhu,konversi angka ke nama angka,diamon

#include <iostream>
#include <math.h>
#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 pilih, pilih1, c, r, k, pola,i,n,j   ;
    double hasil;
    do{
    cout << ""<< endl ;
    cout<<"Menu"<<endl;
    cout<<"1. Menghitung suhu"<<endl;
    cout<<"2. Konversi"<<endl;
    cout<<"3. Pola Diamond"<<endl;
    cout<<"4. Exit"<<endl;
    cout<<"Masukkan pilihan anda: ";
    cin>>pilih;
    switch(pilih){

        case 1:
            cout << ""<< endl ;
            cout<<"Menu Menghitung suhu"<<endl;
            cout<<"1. fahrenheit ke celcius"<<endl;
            cout<<"2. fahrenheit ke reamur"<<endl;
            cout<<"3. fahrenheit ke kelvin"<<endl;
            cout<<"Masukkan pilihan anda: ";
            cin>>pilih1;
            switch(pilih1){
                case 1:
                    cout<<"masukkan suhu fahrenheit "; cin>>c;
                    hasil = 0.55*(c-32);
                    cout << "Hasilnya adalah : " << hasil <<endl ;
                    break;
                case 2:
                    cout<<"masukkan suhu fahrenheit "; cin>>r;
                    hasil = 0.44*(r-32);
                    cout << "Hasilnya adalah : " << hasil <<endl ;
                    break;
                case 3:
                    cout<<"masukkan suhu fahrenheit ";cin>>k;
                    hasil = 0.55*(k-32)+273.15;
                    cout << "Hasilnya adalah : " << hasil <<endl ;
                    break;
                }
            break;

           case 2:{
            cout << ""<< endl ;
            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";
           }break;

            case 3:
            cout << ""<< endl ;
            cout<<"Pola diamond"<<endl;
            cout<<"masukkan angka "<<endl; cin>>n;

            for (i=1 ; i<=n; i++)
            {
            for (j=0; j < (n-i); j++)
                cout <<" ";
            for (j=1; j<=i;j++)
                cout<<"* ";
             cout<<"\n";
            }
            for (i=2; i<=n; i++)
            {
            for (j = n-i;j<=n-2; j++)
                cout<<" ";
            {
                for (j=n-i;j>=0;j--)
                    cout<<"* ";
            }
            cout<<"\n";
            }



    }
    }while(pilih!=4);
}