C++语言: Codee#25730
01 #include <>iostream>
02 using namespace std;
03
04 union U
05 {
06 private:
07 int i;
08 float f;
09 public:
10 U(int a);
11 U(float b);
12 ~U();
13 int read_int();
14 float read_float();
15 };
16
17 U::U(int a)
18 {
19 i = a;
20 }
21
22 U::U(float b)
23 {
24 f = b;
25 }
26
27 U::~U()
28 {
29 cout << "U::~U()\n";
30 }
31
32 int U::read_int()
33 {
34 return i;
35 }
36
37 float U::read_float()
38 {
39 return f;
40 }
41
42 int main()
43 {
44 U x(12), y(1.9f);
45 cout << x.read_int() << endl;
46 cout << x.read_float() << endl; // just union in c with member functions
47
48 cout << end << y.read_float() << endl;
49
50 return 0;
51 }
02 using namespace std;
03
04 union U
05 {
06 private:
07 int i;
08 float f;
09 public:
10 U(int a);
11 U(float b);
12 ~U();
13 int read_int();
14 float read_float();
15 };
16
17 U::U(int a)
18 {
19 i = a;
20 }
21
22 U::U(float b)
23 {
24 f = b;
25 }
26
27 U::~U()
28 {
29 cout << "U::~U()\n";
30 }
31
32 int U::read_int()
33 {
34 return i;
35 }
36
37 float U::read_float()
38 {
39 return f;
40 }
41
42 int main()
43 {
44 U x(12), y(1.9f);
45 cout << x.read_int() << endl;
46 cout << x.read_float() << endl; // just union in c with member functions
47
48 cout << end << y.read_float() << endl;
49
50 return 0;
51 }
C++语言: Codee#25731
01 #include <iostream>
02 using namespace std;
03
04 class SuperVar
05 {
06 enum
07 {
08 character,
09 integer,
10 floating_point
11 } vartype;
12 union
13 {
14 char c;
15 int i;
16 float f;
17 };
18 public:
19 SuperVar(char ch);
20 SuperVar(int ii);
21 SuperVar(float ff);
22 void print();
23 };
24
25 SuperVar::SuperVar(char ch)
26 {
27 vartype = character;
28 c = ch;
29 }
30
31 SuperVar::SuperVar(int ii)
32 {
33 vartype = integer;
34 i = ii;
35 }
36
37 SuperVar::SuperVar(float ff)
38 {
39 vartype = floating_point;
40 f = ff;
41 }
42
43 void SuperVar::print()
44 {
45 switch(vartype)
46 {
47 case character:
48 cout << "character: " << c << endl;
49 break;
50 case integer:
51 cout << "integer: " << i << endl;
52 break;
53 case floating_point:
54 cout << "float: " << f << endl;
55 break;
56 }
57 }
58
59 int main()
60 {
61 SuperVar A('c'), B(12), C(1.44F);
62 A.print();
63 B.print();
64 C.print();
65
66 return 0;
67 }
02 using namespace std;
03
04 class SuperVar
05 {
06 enum
07 {
08 character,
09 integer,
10 floating_point
11 } vartype;
12 union
13 {
14 char c;
15 int i;
16 float f;
17 };
18 public:
19 SuperVar(char ch);
20 SuperVar(int ii);
21 SuperVar(float ff);
22 void print();
23 };
24
25 SuperVar::SuperVar(char ch)
26 {
27 vartype = character;
28 c = ch;
29 }
30
31 SuperVar::SuperVar(int ii)
32 {
33 vartype = integer;
34 i = ii;
35 }
36
37 SuperVar::SuperVar(float ff)
38 {
39 vartype = floating_point;
40 f = ff;
41 }
42
43 void SuperVar::print()
44 {
45 switch(vartype)
46 {
47 case character:
48 cout << "character: " << c << endl;
49 break;
50 case integer:
51 cout << "integer: " << i << endl;
52 break;
53 case floating_point:
54 cout << "float: " << f << endl;
55 break;
56 }
57 }
58
59 int main()
60 {
61 SuperVar A('c'), B(12), C(1.44F);
62 A.print();
63 B.print();
64 C.print();
65
66 return 0;
67 }