using namespace std;
void main()
{
int a[4];
cout<<"請輸入第壹個復數的實部:"<<endl;
cin>> a[0];
cout<<"請輸入第壹個復數的虛部:"<<endl;
cin>> a[1];
cout<<"請輸入第二個復數的實部:"<<endl;
cin>> a[2];
cout<<"請輸入第二個復數的虛部:"<<endl;
cin>> a[3];
cout<<"兩個復數的乘積為:"<<endl;
if((a[0] * a[2] - a[1] * a[3]) < 0)
cout<< "(" << a[0] * a[2] - a[1] * a[3] << ") + " ;
else
cout<< a[0] * a[2] - a[1] * a[3] << " + ";
if((a[0] * a[2] + a[1] * a[3]) < 0)
cout<< "(" << a[0] * a[2] + a[1] * a[3] << ")i" <<endl;
else
cout<< a[0] * a[2] + a[1] * a[3] << "i" <<endl;
}