int Length const i return curLen; f /求当前串this的实际长度 String &operator(( int pos, int len ) /取thi从pos开始len个字符组成的子串 int operator =- const String &ob) ireturn strcmp(ch, ob.ch)=0;3 /判当前串*this与对象串ob是否相等 int operator !=( const String &ob const return strcmp(ch, ob.ch)!=0; 3 /判当前串ths与对象串ob是否不等int Length ( ) const { return curLen; } //求当前串*this的实际长度 String &operator ( ) ( int pos, int len ); //取*this从pos开始len个字符组成的子串 int operator == ( const String &ob ) { return strcmp (ch, ob.ch) == 0; } //判当前串*this与对象串ob是否相等 int operator != ( const String &ob ) const { return strcmp (ch, ob.ch) != 0; } //判当前串*this与对象串ob是否不等