Switch kullanarak 4 işlem yapan basit bir hesap makinesi C++ Kodları

#include <iostream>
using namespace std;
int main()
{
 
cout<<"******************************"<<endl;
cout<<"* *"<<endl;
cout<<"* HESAP MAKINESI *"<<endl;
cout<<"* *"<<endl;
cout<<"* Toplama Icin + kullaniniz *"<<endl;
cout<<"* Cikarma Icin - kullaniniz *"<<endl;
cout<<"* Carpma Icin * kullaniniz *"<<endl;
cout<<"* Bolme Icin / kullaniniz. *"<<endl;
cout<<"* *"<<endl;
cout<<"* *"<<endl;
cout<<"******************************"<<endl;
cout<<endl;
baslat:
double sayi1,sayi2,sonuc;
char islem;
 
cout<<"Birinci sayiyi giriniz: ";
cin>>sayi1;
cout<<endl;
 
cout<<"Islemi giriniz: ";
cin>>islem;
cout<<endl;
 
cout<<"Ikinci sayiyi giriniz: ";
cin>>sayi2;
cout<<endl;
 
switch (islem)
{
case '+':
sonuc = (sayi1+sayi2);
cout<<"Toplamanin sonucu: "<<sonuc<<endl; break;
case '-':
sonuc = (sayi1-sayi2);
cout<<"Cikarmanin sonucu: "<<sonuc<<endl; break;
case '*':
sonuc = (sayi1*sayi2);
cout<<"Carpmanin sonucu: "<<sonuc<<endl; break;
case '/':
sonuc = (sayi1/sayi2);
cout<<"Bolmenin sonucu: "<<sonuc<<endl; break;
}
}