tugas 3 dasar dasar pemrograman

#include <iostream.h>
#include <conio.h>


int main(){
       
       int pilihan;
       double nilai1, nilai2, hasil;
       float a,b;
       cout<<"\t----------------------------------------------------------"<<endl;
       cout<<"\t|                 KALKULATOR SEDERHANA                   |"<<endl;
       cout<<"\t|                                                        |"<<endl;
       cout<<"\t| pilihlah salah satu operasi (1,2,3,4,5)                |"<<endl;
       cout<<"\t| 1. operasi perjumlahan                                 |"<<endl;
       cout<<"\t| 2. operasi pengurangan                                 |"<<endl;
       cout<<"\t| 3. operasi perkalian                                   |"<<endl;
       cout<<"\t| 4. operasi pembagian                                   |"<<endl;
       cout<<"\t| 5. operasi kuadrat                                     |"<<endl;
       cout<<"\t----------------------------------------------------------"<<endl;
       cout<<endl;
       cout<<"masukkan pilihan : ";
       cin>>pilihan;
       cout<<endl<<endl;
       switch(pilihan){
                       
                       case 1: //penjumlahan
                            cout<<"masukkan nilai 1 : ";
                            cin>>nilai1;
                            cout<<"masukkan nilai 2 : ";
                            cin>>nilai2;
                            
                            hasil=nilai1+nilai2;
                       
                            cout<<"hasil penjumlahan : "<<hasil;
                            break;
                            
                       case 2: //pengurangan
                             cout<<"masukkan nilai 1 : ";
                             cin>>nilai1;
                             cout<<"masukkan nilai 2 : ";
                             cin>>nilai2;
                             
                             hasil=nilai1-nilai2;
                             cout<<"hasil pengurangan : "<<hasil;
                             break;
                             
                       case 3: //perkalian
                             cout<<"masukkan nilai 1 : ";
                             cin>>nilai1;
                             cout<<"masukkan nilai 2 : ";
                             cin>>nilai2;
                             hasil=nilai1*nilai2;
                             
                             cout<<"hasil perkalian : "<<hasil;
                             break;
                       
                       case 4: //pembagian
                             cout<<"masukkan nilai 1 : ";
                             cin>>nilai1;
                             cout<<"masukkan nilai 2 : ";
                             cin>>nilai2;
                             hasil=nilai1/nilai2;
                             
                             cout<<"hasil pembagian : "<<hasil;
                             break;
                             
                       case 5: //kuadrat
                             cout<<"masukkan nilai : ";
                             cin>>nilai1;
                             
                             hasil=nilai1*nilai1;
                             
                             cout<<"hasil kuadrat : "<<hasil;
                             break;
                                   
                       default: 
                       cout<<"SALAH!! ";
                       }
                       
                       getch();
                       return 0;
       

}