菜鸟提问，高手帮忙！

[lovecrayfish]

#include <iostream.h>
class base{
protected:
　int x,y;
public:
　void setxy(int a, int b){x=a;y=b);}
};
class derived:public base{
private:
　int k;
public:
　void setk(){}
　void print(){ }
};
inline void derived::setk(){
k=x*y;
}
inline void derived::print(){
cout<<x<<"*"<<y<<"="<<k<<endl;
}
void main(){
derived w;
w.setxy(8,9);
w.setk();
w.print();
}

以上程序调试时为什么会有以下错误：
E:\dragon\program\c++\p126-1.cpp(4) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(4) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(6) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(6) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(10) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(10) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(12) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(12) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(13) : error C2018: unknown character '0xa1'
E:\dragon\program\c++\p126-1.cpp(13) : error C2018: unknown character '0xa1'
Error executing cl.exe.

[lanhuaiyu]

public:
　void setxy(int a, int b){x=a;y=b);}
修改为
public:
　void setxy(int a, int b){x=a;y=b;}
再检查检查是否有中文字符；

[gernal_dn]

unknown character '0xa1'
据我所知，十六进制的ASCII码A1A1对应为中文字符的空格！
你程序第4,6,10,12,13行的行首混入了中文空格（表现为，选中时比英文空格宽），把它改为英文的。

[xingliwei]

#include <iostream.h>
class base{
protected:
int x,y;
public:
void setxy(int a, int b){x=a;y=b;}
};
class derived:public base{
private:
int k;
public:
void setk();
void print();
};
inline void derived::setk()
{
k=x*y;
}
inline void derived::print()
{
cout<<x<<"*"<<y<<"="<<k<<endl;
}
void main(){
derived w;
w.setxy(8,9);
w.setk();
w.print();
}
这样就没问题了