c++入门之结构体初步

 1 #include "iostream"
 2 # include "cmath"
 3 struct polar
 4 {
 5     double distance;
 6     double angle;
 7 };
 8 struct rect
 9 {
10     double x;
11     double y;
12 };
13 void rect_to_polar(rect*pa, polar*pb);
14 void show_polar(polar*pc);
15 int main()
16 {
17     using namespace std;
18     rect zhijiao;
19     polar ji;
20     cout << "please input the x and the y:" << endl;
21     while (cin >> zhijiao.x >> zhijiao.y)
22     {
23         rect_to_polar(&zhijiao, &ji);
24         show_polar(&ji);
25         cout << "next two nbumber(q to quit:):";
26     }
27     cout << "Done" << endl;
28     return 0;
29 }
30 
31 void rect_to_polar(rect*pa, polar*pb)
32 {
33     using namespace std;
34     pb->distance = sqrt(pa->x*pa->x+ pa->y*pa->y);
35     pb->angle = atan2(pa->y, pa->x);
36 }
37 
38 void show_polar(polar*pc)
39 {
40     using namespace std;
41     const double exchange = 57.29577951;
42     cout << "distance is:" << pc->distance << endl;
43     cout << "angle is:" << pc->angle* exchange << endl;
44     cout << "over" << endl;
45 
46 }