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TWEET # Untitled a guest Feb 17th, 2020 60 Never
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1. #include <iostream>
2. #include <cmath>
3. #include <stdio.h>
4. using namespace std;
5. class geom
6. {
7.     public:
8.     geom(float, float, float, float, float, float, float, float);
9.     float x1,y1,x2,y2,x3,y3,x4,y4;
10.     float perim(void);
11.     float area(void);
12. };
13. geom::geom(float cx1, float cy1, float cx2, float cy2, float cx3, float cy3, float cx4, float cy4)
14. {
15.     x1=cx1;
16.     x2=cx2;
17.     x3=cx3;
18.     x4=cx4;
19.     y1=cy1;
20.     y2=cy2;
21.     y3=cy3;
22.     y4=cy4;
23. }
24. float geom::area(void)
25. {
26.     return(0.5*fabs((x2-x1)*(y3-y1)-(x3-x1)*(y2-y1))+0.5*fabs((x4-x1)*(y3-y1)-(x3-x1)*(y4-y1)));
27. }
28. float geom::perim(void)
29. {
30.   return(hypot(x2-x1,y2-y1)+hypot(x3-x2,y3-y2)+hypot(x4-x3,y4-y3)+hypot(x1-x4,y1-y4));
31. }
32. int main()
33. {
34.     float x1=0.5, y1=0, x2=0, y2=1, x3=1, y3=1, x4=1, y4=0;
35.     geom a(x1,y1,x2,y2,x3,y3,x4,y4);
36.     printf("perim=%f  area=%f",a.perim(),a.area());
37.     return 0;
38. }
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