摘要： The original Linklist is as diagram shown: the codes are following node *reverse(node *head) { node *p1,*p2,*p3; if(head==NULL || head->next=-NULL) return head; //p1-->previou... 阅读全文

摘要： A: Never. cos virtual functions has costs. Each object of virtual function must have a v table to manage them.Therefore using virtual function will need system costs. for only a very small class and ... 阅读全文

摘要： A: virtual function uses virtual calling. virtual calling is a kind of operation mechanism which can run on the condition of part information being provided. it allows us to call a function that... 阅读全文

摘要： 本文深刻讲述了为什么有些基类的析构函数要设为virtual? 阅读全文

摘要： Q: in C++ programming language, Is it right to define a class as the following shown: class A{ const int Size=0; } A: no, it's wrong! 在C++中，这样是错误的，常量成员的初始化必须在构造函数中完成。 the initiation of const must be... 阅读全文

摘要： Q: if struct can have the construtor/desctructor and memeber functions ? if so, what's the diff between struct& class? A: Yes! and the diff is that: in Class ,the default variables access typ... 阅读全文

摘要： please wirte a program to realize the model described in the figure. you shoudl design your program as negeric as possible so that we can enhance the model in the future ealily without making too ... 阅读全文

摘要： Q: Below is usual way we find one element in an array: in this case we have to bear the knowledge of value type"int",the size of array,even the existence of an array. would you re-write it... 阅读全文

摘要： #include "iostream" #include"string.h" #include "stdio.h" class A{ }; class A2{ char d,e; }; struct B{ }; struct C{ char b,c; }; struct D{ int x,y; }; int main() { count<<sizeof(A)<<endl; cout<<... 阅读全文

摘要： to define a const, we can use const as well as #define in C++ .however the former has more benifits than later. 1) const has data type ,however Macro has no. so the complier can check ... 阅读全文

摘要： #define MIN(A,B) ((A)<=(B)?(A):(B)) 阅读全文

摘要： to avoid that the head file is referenced more than twice. 阅读全文

摘要： C++ support overload, but C not. and the name of function in library which is complied by C++ complier is different from that which is complied by C complier. for example: if a function prototyp... 阅读全文

摘要： there are two ways: 1: a=a+b; b=a-b; a=a-b; //in this case, if a or b is a very big number, a+b maybe will overflow. 2: a=a^b; b=a^b; a=a^b; 阅读全文