01.#include<iostream>
02.#include<Cmath>
03.using namespace std;
04.
05.class CPoint
06.{
07.private:
08. double x; // 横坐标
09. double y; // 纵坐标
10.public:
11. void input(); //以x,y 形式输入坐标点
12. float Distance(CPoint p) const; // 两点之间的距离(一点是当前点，另一点为参数p)
13.};
14.
15.class CTriangle
16.{
17.public:
18. CTriangle(CPoint &X,CPoint &Y,CPoint &Z):A(X),B(Y),C(Z){} //给出三点的构造函数
19. void setTriangle(CPoint &X,CPoint &Y,CPoint &Z); //输入三角形点的坐标
20. float perimeter(void); //计算三角形的周长
21. float area(void); //计算并返回三角形的面积
22. bool isRightTriangle(); //是否为直角三角形
23. bool isIsoscelesTriangle(); //是否为等腰三角形
24.private:
25. CPoint A,B,C; //三顶点
26.};
main:
[cpp] view plaincopyprint?
01.#include"CTriangle.h"
02.#include<iostream>
03.using namespace std;
04.
05.void main()
06.{
07. CPoint c1, c2, c3;
08.
09. c1.input();
10.
11. c2.input();
12.
13. c3.input();
14.
15. CTriangle c(c1, c1, c1);
16.
17. c.setTriangle(c1, c2, c3);
18.
19. cout << "三角形的周长是:" << c.perimeter() << endl;
20.
21. cout << "三角形的面积是:" << c.area() << endl;
22.
23. cout << (c.isRightTriangle()?"是":"不是") << "直角三角形" <<endl;
24.
25. cout << (c.isIsoscelesTriangle()?"是":"不是") << "等腰三角形" <<endl;
26.
27. system("pause");
28.}
资源文件：
[cpp] view plaincopyprint?
01.#include"CTriangle.h"
02.#include<iostream>
03.using namespace std;
04.
05.float CPoint::Distance(CPoint p) const
06.{
07. return sqrt((p.x - x) * (p.x - x) + (p.y - y) * (p.y - y));
08.}
09.
10.void CPoint::input() //以x,y 形式输入坐标点
11.{
12. char comma;
13. cout << "请输入点坐标,格式： x,y" << endl;
14.
15. while(1)
16. {
17. cin >> x >> comma >> y ;
18. if(comma != ',')
19. {
20. cout << "格式不正确，请重新输入：" << endl;
21. }
22. else
23. {
24. break;
25. }
26. }
27.}
28.
29.void CTriangle::setTriangle(CPoint &X, CPoint &Y, CPoint &Z)
30.{
31. float s1 = X.Distance(Y);
32.
33. float s2 = Y.Distance(Z);
34.
35. float s3 = X.Distance(Z);
36.
37. if(s1 + s2 > s3 && s2 + s3 > s1 && s1 + s3 > s2)
38. {
39. A = X;
40.
41. B = Y;
42.
43. C = Z;
44. }
45.
46. else
47. {
48. cout << "不能构成三角形，退出！" << endl;
49. exit(1);
50. }
51.
52.}
53.
54.float CTriangle::perimeter(void)
55.{
56. return (A.Distance(B) + B.Distance(C) + A.Distance(C));
57.}
58.
59.float CTriangle::area(void)
60.{
61. float a = A.Distance(B);
62.
63. float b = B.Distance(C);
64.
65. float c = A.Distance(C);
66.
67. float p = (a + b + c) / 2;
68.
69. return sqrt( p * (p - a) * (p - b) * (p - c) );
70.}
71.
72.bool CTriangle::isRightTriangle()
73.{
74. float a = A.Distance(B);
75.
76. float b = B.Distance(C);
77.
78. float c = A.Distance(C);
79.
80. if(a * a + b * b == c * c || a * a + c * c == b * b || c * c + b * b == a * a)
81. {
82. return true;
83. }
84.
85. else
86. {
87. return false;
88. }
89.}
90.
91.bool CTriangle::isIsoscelesTriangle()
92.{
93. float a = A.Distance(B);
94.
95. float b = B.Distance(C);
96.
97. float c = A.Distance(C);
98.
99. if(a == b || b == c || a == c)
100. {
101. return true;
102. }
103.
104. else
105. {
106. return false;
107. }
108.}
解答
01.#include<iostream>
02.
03.using namespace std;
04.
05.class Time
06.{
07.public:
08. Time(int=0,int=0,int=0);
09. void show_time( ); //根据is_24和from0，输出适合形式-20:23:5/8:23:5 pm/08:23:05 pm
10. void add_seconds(int); //增加n秒钟
11. void add_minutes(int); //增加n分钟
12. void add_hours(int); //增加n小时
13. static void change24(); //改变静态成员is_24，在和时制之间转换
14. static void changefrom0(); //改变静态成员from0，切换是否前导0
15.private:
16. static bool is_24; //为true时，24小时制，如20:23:5；为flase，12小时制，显示为8:23:5 pm
17. static bool from0; //为true时，前导0，8:23:5显示为08:23:05
18. int hour;
19. int minute;
20. int sec;
21.};
22.//下面写出静态成员的初始化及各成员函数的定义
23.
24.bool Time::is_24 = true;
25.bool Time::from0 = false;
26.
27.Time::Time( int h, int m, int s ) : hour(h), minute(m), sec(s){};
28.
29.void Time::show_time()
30.{
31. //输出时
32.
33. int h = ( is_24 ) ? hour : hour % 12;
34.
35. if ( h < 10 && from0 )
36.
37. cout << "0";
38.
39. cout << h << ":";
40.
41. //输出分
42. if ( minute < 10 && from0 )
43.
44. cout << "0";
45.
46. cout << minute << ":";
47.
48. //输出秒
49. if ( sec < 10 && from0 )
50.
51. cout << "O";
52.
53. cout << sec ;
54.
55. //输出 am / pm
56. if ( h > 12 )
57.
58. cout << "pm" << endl;
59.
60. else
61.
62. cout << "am" << endl;
63.
64.}
65.
66.void Time::add_seconds(int n)
67.{
68. sec += n;
69.
70. if (sec > 59 )
71. {
72. add_minutes( sec / 60 );
73.
74. sec = sec % 60;
75. }
76.}
77.
78.void Time::add_minutes( int n )
79.{
80. minute += n;
81.
82. if ( minute > 59 )
83. {
84. add_hours ( minute / 60 );
85.
86. minute = minute % 60;
87. }
88.}
89.
90.void Time::add_hours( int n )
91.{
92. hour += n;
93.
94. if ( hour > 24 )
95. {
96. hour = hour % 24;
97. }
98.}
99.
100.void Time::change24()
101.{
102. is_24 = !is_24;
103.}
104.
105.void Time::changefrom0()
106.{
107. from0 = !from0;
108.}
109.
110.int main( )
111.{
112. Time t1(23,14,25),t2(8,45,6);
113. cout<<"24时制, 不前导："<<endl;
114. cout<<" t1是：";
115. t1.show_time();
116. cout<<" t2是：";
117. t2.show_time();
118. t1.add_hours(10);
119. t2.add_hours(10);
120. Time::changefrom0(); //注意此处调用静态成员
121. cout<<"10小时后, 切换是否前导："<<endl;
122. cout<< "t1是：";
123. t1.show_time();
124. cout<< "t2是：";
125. t2.show_time();
126. t1.change24();
127. cout<<"换一种制式："<<endl;
128. cout<<" t1是：";
129. t1.show_time();
130. cout<<" t2是：";
131. t2.show_time();
132. system("pause");
133. return 0;
134.}
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