Hesap Makinesi %100 Çalışıyor

Switch case komutludur. Hakan Gözüböyük en başta n harfi çıkıyor o çıkarsa silin.
#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{


cout<<"**************************************"<<endl;
cout<<"* HESAP MAKİNESİ V.1.0 *"<<endl;
cout<<"* *"<<endl;
cout<<"* TOPLAMA ICIN[+] *"<<endl;
cout<<"* CIKARMA ICIN[-] *"<<endl;
cout<<"* BOLME ICIN[/] *"<<endl;
cout<<"* CARPMA ICIN[*] *"<<endl;
cout<<"* *"<<endl;
cout<<"* Islemlerini kullaniniz. *"<<endl;
cout<<"* *"<<endl;
cout<<"* HAZIRLAYAN: HAKAN GOZUBUYUK *"<<endl;
cout<<"* killedby_hkn@hotmail.com *"<<endl;
cout<<"**************************************"<<endl;










float sayi1,sayi2,sonuc;
char islem;


cout<<"bir sayi giriniz : ";
cin>>sayi1;


cout<<"Islemi giriniz(+,-,*,/) : ";
cin>>islem;

cout<<"ikinci sayiyi giriniz : ";
cin>>sayi2;




switch(islem)

{
case'+':

cout<<"Toplama sonucu :"<<(sonuc=sayi1+sayi2)<<endl; break;


case'-':

cout<<"Cıkarma sonucu :"<<(sonuc=sayi1-sayi2)<<endl; break;

case'*':

cout<<"Carpma sonucu :"<<(sonuc=sayi1*sayi2)<<endl; break;

case'/':

cout<<"Bolme sonucu :"<<(sonuc=sayi1/sayi2)<<endl; break;


}
system("PAUSE");
return EXIT_SUCCESS;
}