void Clock SetTime( int NewH, int NewM int News) Hour=NewH: 类名:加在成员函数名之前 Minute=NewM;而不是加在函数的返回类型前 Second=NewS: void Clock ShowTime cout<<Hour<<<<Minute<<<<Secondvoid Clock :: SetTime(int NewH, int NewM, int NewS) { Hour=NewH; Minute=NewM; Second=NewS; } void Clock :: ShowTime() { cout<<Hour<<":"<<Minute<<":"<<Second; } 19 类名::加在成员函数名之前 而不是加在函数的返回类型前