我不知道如何正确描述我的问题，所以我会告诉你：
Main.cpp的
<remove name... /> #include"stdafx.h"
using namespace std;
int main()
{
char count = 'y';
char del = 'y';
char doi = 'l';
length trl;
angle krl;
Sum *d2, *d3, *a;
coordinates * ob = &trl;
coordinates * bb = &krl;
while (cont = 'y') {
cout << "what program should do:" << endl;
cout << "write c if you want find angle between two vectors " << endl;
cout << "write l if you want find length between two points" << endl;
cout << "write s if you want find two vectors sum" << endl;
cin >> veiks;
if (doi == 'l') { ob->action(); ob->Output(); }
else if (doi == 'c') { bb->action(); bb->Output(); }
else if (doi == 's') { a->action(); d3 = d2 + a; d3->Output(); }
else cout << "No action isn't selected" << endl;
cout << "If you want repeat program write: y, if you want end work press any key "; cin >> count;
if (count != 'y')
break;
cout << "Do you want to clean-up screen? "; cin >> del;
if (del == 'y') system("CLS");
}
return 0;
}
部分d3 = d2 + a显示错误：
a任何想法如何解决？
.h 档案
expression must have integral or unscoped enum type