三、改错题（本大题共5小题，每小题4分，共20分）

下面的每题中有一处错误，请在“答题纸”上将错误所在行写出并给出修改意见。

41. #include <iostream.h>

     class point{

     private: float x,y；

     public: point( float a,float b){x=a;y=b;}

       void f(){x=0;y =0；}

 void getx(){cout<<x<<endl;}

       void gety(){cout<<y<<endl;}

     } ；

   main( ) {

     point a(3.5)；

     a.getx( )；

 }

42. #include < iostream. h >

 main( ) {

    int x =7;

    const int *p = &x;

    *p =99;

    cout << *p << endl;

    }

43. #include < iostream. h >

 class test{

     private: int x;y;

 public: voicl f( int a,int b) { x = a;y = b; }

       int max( ) { return(x > y) ? x:y; }

   };

 main( ) {

     test a;

     a. f( 1 ,3) ;

     cout << a. max( ) << endl;

     }

44. #include <iostream h >

 class test{

     private: int x;

 public:test(int a) { x = a; }

 void set(int a) { x = a;}

 void get( ) { cout << x << endl; }

 };

 class testl: public test{

 private: int x;

 public :testl ( int a) { x = a; }

 void set( int a) { x = a;}

 void get( ) { cout <<′′<< endl; }

 };

45. #include < iostream. h >

 class f{

 private: int x,y;

 public: fl ( int a,int b) { x = a;y = b; }

 void print( ) { cout << x << --<< y << endl; }

 };

 main( ) {

 f a;

 float x = 1.0,y = 2. 0;

 a. fl ( x,y) ;

 a. print( ) ;

 }