程序改错

C/C++ code

#include <iostream>                  using  namespace  std;class boolit{public:    void setword(char w)        {        word=w;                 }    void print()    {         cout<<word;    }   private:    char word;                       };int  main(){    boolit b1;                 b1.setword(a);                     b1.print();    system("pause");    return 0;}

提示error C2065: “a”: 未声明的标识符..请问原因??以及如何改错???

[解决办法]
a未定义，如果作为字符应该用 'a'
[解决办法]

C/C++ code

#include <iostream>                  using  namespace  std;class boolit{public:    void setword(char w)        {        word=w;                 }    void print()    {         cout<<word;    }   private:    char word;                       };int  main(){    boolit b1;                 b1.setword('a');                     b1.print();    system("pause");    return 0;}