C++的问题，求助

小羊爱吃小草

1. #include<iostream>
   
2. using namespace std;
   
3. 
   
4. class Singer
   
5. {
   
6.         protected:
   
7.                 string name;
   
8.                 char sex;
   
9.                 int age;
   
10.                 double score;
    
11.         public:
    
12.                 string getName() const{ return name; };
    
13.                 Singer(string name="", char s='?' ,int a=0,double n=0 );//构造函数要写的
    
14.                 friend istream& operator >> (istream &, Singer &);
    
15.                 bool operator >(Singer & a) ;
    
16.                 bool operator ==(Singer &b) ;
    
17.                 friend ostream& operator << (ostream &, const Singer &);
    
18. };
    
19. Singer::Singer(string name, char s, int a,double n )
    
20. {
    
21.     this->name= name;
    
22.     score = n;
    
23.     sex = s;
    
24.     age = a;
    
25. }
    
26. istream& operator >> (istream & myin, Singer & sin)
    
27. {
    
28.         myin >> sin.name >> sin.sex >> sin.age >> sin.score;
    
29.         return myin;
    
30. }
    
31. ostream& operator << (ostream & myout, const Singer & sing)
    
32. {
    
33.         myout << sing.name << sing.sex << sing.age << sing.score;
    
34.         return myout;
    
35. }
    
36. bool operator >(Singer & a)
    
37. {
    
38.         if(this->score > a.score)
    
39.         return true;
    
40.         else
    
41.         return false;
    
42. }
    
43. bool operator ==(Singer &b)
    
44. {
    
45.         if(this->score == b.score)
    
46.         return true;
    
47.         else
    
48.         return false;       
    
49. }
    
50. 
    
51. int main()
    
52. {
    
53. Singer s1,s2;
    
54. cin>>s1>>s2;
    
55. cout<<s1<<"\n"<<s2<<endl;
    
56. if(s1>s2)
    
57. cout<<s1.getName()<<"'s score is higher than "<<s2.getName()<<"'s.\n";
    
58. 
    
59. else if(s1==s2)
    
60. cout<<s1.getName()<<"'s score is equal to "<<s2.getName()<<"'s.\n";
    
61. 
    
62. else
    
63. cout<<s1.getName()<<"'s score is lower than "<<s2.getName()<<"'s.\n";
    
64. 
    
65. return 0;
    
66. 
    
67. }

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//bool的地方出了问题，但我不知道哪里有问题，感谢