1 /*-------------------------------------
2 rect_pol.c -- 把直角坐标转换为极坐标
3 -------------------------------------*/
4
5 #include <stdio.h>
6 #include <math.h>
7
8 #define RAD_TO_DEG (180 / (4 * atan(1.0)))
9
10 typedef struct polar_v
11 {
12 double magnitude;
13 double angle;
14 } Polar_V;
15
16 typedef struct rect_v
17 {
18 double x;
19 double y;
20 } Rect_V;
21
22 Polar_V rect_to_polar(Rect_V);
23
24 int main()
25 {
26 Rect_V input;
27 Polar_V result;
28
29 puts("Enter x and y coordinates; enter q to quit:");
30 while (scanf("%lf %lf", &input.x, &input.y) == 2)
31 {
32 result = rect_to_polar(input);
33 printf("magnitude = %0.2f, angle = %0.2f\n", result.magnitude, result.angle);
34 }
35
36 return 0;
37 }
38
39 Polar_V rect_to_polar(Rect_V rv)
40 {
41 Polar_V pv;
42
43 pv.magnitude = sqrt(pow(rv.x, 2) + pow(rv.y, 2));
44 if (pv.magnitude == 0)
45 pv.angle = 0;
46 else
47 pv.angle = RAD_TO_DEG * atan2(rv.y, rv.x);
48
49 return pv;
50 }
