#include <iostream>

using namespace std;

struct ComplexNum {
    double Real, Imagine;
};
ComplexNum ComplexSum (const ComplexNum &X, const ComplexNum &Y) {
    ComplexNum Z;
    Z.Real = X.Real + Y.Real;
    Z.Imagine = X.Imagine + Y.Imagine;
    return Z;

}
ComplexNum ComplexDif (const ComplexNum &X, const ComplexNum &Y) {
    ComplexNum Z;
    Z.Real = X.Real - Y.Real;
    Z.Imagine = X.Imagine - Y.Imagine;
    return Z;

}
ComplexNum ComplexMult (const ComplexNum &X, const ComplexNum &Y) {
    ComplexNum Z;
    Z.Real = X.Real * Y.Real - X.Imagine * Y.Imagine ;
    Z.Imagine = X.Real * Y.Imagine + X.Imagine * Y.Real;
    return Z;

}
ComplexNum ComplexDiv (const ComplexNum &X, const ComplexNum &Y) {
    ComplexNum Z;
    Z.Real = (X.Real * Y.Real + X.Imagine * Y.Imagine) / (Y.Real * Y.Real + Y.Imagine * Y.Imagine ) ;
    Z.Imagine = (X.Imagine * Y.Real - X.Real * Y.Imagine) / (Y.Real * Y.Real + Y.Imagine * Y.Imagine ) ;
    return Z;

}
int main()
{
    cout << "Please enter the first expression: \n";
    ComplexNum A;
    cin >> A.Real >> A.Imagine;
    cout << "Please enter the second expression: \n";
    ComplexNum B;
    cin >> B.Real >> B.Imagine;
    cout << "OK, please enter the operation ( + ,- ,* , / ): \n";
    char Operation;
    cin >> Operation;
    ComplexNum C;
    switch (Operation) {
        case '-':
            C = ComplexDif(A, B);
            cout << "a - b = " << C.Real << ' ' << C.Imagine <<'\n';
            break;
        case '+':
            C = ComplexSum(A, B);
            cout << "a + b = " << C.Real << ' ' << C.Imagine <<'\n';
            break;
            case '*':
            C = ComplexMult(A, B);
            cout << "a * b = " << C.Real << ' ' << C.Imagine <<'\n';
            break;
            case '/':
            C = ComplexDiv(A, B);
            cout << "a / b = " << C.Real << ' ' << C.Imagine <<'\n';
            break;
    }
    return 0;
}