C++ 面试题与答案
相关差异对比
问题 116. What is polymorphism?
Polymorphism is the idea that a base class can be inherited by several classes. A base class pointer can point to its child class and a base class array can store different child class objects.
问题 117. How can you tell what shell you are running on UNIX system?
You can do the Echo $RANDOM. It will return a undefined variable if you are from the C-Shell, just a return prompt if you are from the Bourne shell, and a 5 digit random numbers if you are from the Korn shell. You could also do a ps -l and look for the shell with the highest PID.
问题 118. What is pure virtual function?
A class is made abstract by declaring one or more of its virtual functions to be pure. A pure virtual function is one with an initializer of = 0 in its declaration
问题 119. Write a Struct Time where integer m, h, s are its members
struct Time
{
int m;
int h;
int s;
};
问题 120. How do you traverse a Btree in Backward in-order?
Process the node in the right subtree
Process the root
Process the node in the left subtree
3) What is pure virtual function? 4) Write a Struct Time where integer m, h, s are its members 5) How do you traverse a Btree in Backward in-order? " />
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