操作符重载的概念

 1 #include <stdio.h>
 2 class Complex
 3 {
 4     int a;
 5     int b;
 6 public:
 7     Complex(int a,int b)
 8     {
 9         this->a = a;
10         this->b = b
11     }
12     friend Complex Add(const Complex&p1,const Complex&p2);
13 };
14 Complex Add(const Complex&p1,const Complex&p2)
15 {
16     Complex ret;
17     ret.a = p1.a + p2.a;
18     ret.b = p1.b + p2.b;
19     
20     return ret;
21 }
22 int main()
23 {
24     Complex c1(1,2);
25     Complex c2(3,4);
26     Complex c3 = Add(c1,c2);
27     printf("c3.a = %d,c3.b = %d\n",c3.a,c3.b);
28     return 0;
29 }

1 Type operator Sign（const Type p1,const Type p2）
2 {
3     Type ret;
4     return ret;
5 }

 1 #include <stdio.h>
 2 class Complex
 3 {
 4     int a;
 5     int b;
 6 public:
 7     Complex(int a = 0,int b = 0)
 8     {
 9         this->a = a;
10         this->b = b;
11     }
12     int getA()
13     {
14         return a;
15     }
16     int getB()
17     {
18         return b;
19     }
20     friend Complex operator + (const Complex& p1,const Complex& p2);
21 };
22 Complex operator + (const Complex& p1,const Complex& p2)
23 {
24     Complex ret;
25     ret.a = p1.a + p2.a;
26     ret.b = p1.b + p2.b;
27     return ret;
28 }
29 int main()
30 {
31     Complex c1(1,2);
32     Complex c2(3,4);
33     Complex c3 = c1 + c2;
34     printf("c3.a = %d,c3.b = %d\n",c3.getA(),c3.getB());
35     return 0;
36 }
37  

 1 class Type
 2 {
 3 public:
 4     Type operator Sign(const Type&p)
 5     {
 6         Type ret;
 7         return ret;
 8     }
 9};
10 #include <stdio.h>
11 class Complex
12 {
13     int a;
14     int b;
15 public:
16     Complex(int a = 0,int b = 0)
17     {
18         this->a = a;
19         this->b = b;
20     }
21     int getA()
22     {
23         return a;
24     }
25     int getB()
26     {
27         return b;
28     }
29     Complex operator + (const Complex& p)
30     {
31         Complex ret;
32         ret.a = this->a + p.a;
33         ret.b = this->b + p.b;
34         return ret;
35     }
36 };
37 int main()
38 {
39     Complex c1(1,2);
40     Complex c2(3,4);
41     Complex c3 = c1 + c2;//c1.operator + (c2)
42     printf("c3.a = %d,c3.b = %d\n",c3.getA(),c3.getB());
43     return 0;
44 }