#include <iostream.h>
#include<math.h>
int main()
{
int izbor;
float a,b,c;

while (true) {
cout<<"Input two numbers: "<<endl;
cout<<"a=";
cin>>a;
cout<<"b=";
cin>>b;
cout<<endl;

cout<<"Choose: "<<endl;
cout<<"1. Addition"<<endl;
cout<<"2. Substraction"<<endl;
cout<<"3. Multiplication"<<endl;
cout<<"4. Division"<<endl;
cout<<"5. Power"<<endl;
cout<<"6. Exit"<<endl;
cin>>izbor;

switch (izbor) {
case 1: c=a+b; cout<<"The sum is "<<c; break;
case 2: c=a-b; cout<<"The difference is "<<c; break;
case 3: c=a*b; cout<<"Proizvedenieto e "<<c; break;
case 4: if (b==0) cout<<"nqma re[enie";
        else {c=a/b; cout<<"Chastnoto e "<<c; }
        break;
case 5: c=pow(a,b); cout<<"Rezultata pri stepenuvaneto e "<<c; break;
case 6: exit(0);
}
cout<<endl;
}

    return 0;
}