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c++一些筆試題目和整理的答案

時(shí)間:2022-08-09 23:46:55 綜合指導(dǎo) 我要投稿
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c++一些筆試題目和整理的答案

  NO1

c++一些筆試題目和整理的答案

  Below is usual way we find one element in an array

  const int *find1(const int* array, int n, int x)

  {

  const int* p = array;

  for(int i = 0; i < n; i++)

  {

  if(*p == x)

  {

  return p;

  }

  ++p;

  }

  return 0; }

  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 using template to eliminate all these dependencies?

  template

  const T *find1(const T* array, int n, T x)

  {

  const T* p = array;

  for(int i = 0; i < n; i++)

  {

  if(*p == x)

  {

  return p;

  }

  ++p;

  }

  return 0; }

  NO2

  Give an example of implementing a Stack in the template way(only template class declaration without detail definition and realization)

  template

  class Stack

  {

  public:

  Stack(int = 10) ;

  ~Stack() { [] stackPtr ; }

  int push(const T&);

  int pop(T&) ;

  int isEmpty()const { return top == -1 ; }

  int isFull() const { return top == size - 1 ; }

  private:

  int size ; // number of elements on Stack.

  int top ;

  T* stackPtr ;

  } ;

  NO3

  Implement the simplest singleton pattern(initialize if necessary).

  class Singleton {

  public:

  static Singleton* Instance();

  protected:

  Singleton();

  private:

  static Singleton* _instance;

  }

  // Implementation

  Singleton* Singleton::_instance = 0;

  Singleton* Singleton::Instance() {

  if (_instance == 0) {

  _instance = new Singleton;

  }

  return _instance;

  }

  NO4

  1.Jeff and Diamond like playing game of coins, One day they designed a new set of rules:

  1)Totally 10 coins

  2)One can take away 1,2or 4 coins at one time by turns

  3)Who takes the last loses.

  Given these rules Whether the winning status is pre-determined or not

  解答: 1:從后面開(kāi)始考慮,最后肯定要留1個(gè)才能保證自己贏

  2:所以要設(shè)法讓對(duì)方留下2,3,5個(gè)

  3:也就是要自己取后留下1,4,6,7,8,9

  4:如果自己取后留下6,對(duì)方取2個(gè),與(3)矛盾,所以排除6

  5:如果自己取后留下8,對(duì)方取4個(gè),與(3)一樣情況,所以也排除8

  6:同樣,9也不行,如果我抽后剩下9,對(duì)方抽2個(gè),就反過(guò)來(lái)成對(duì)方抽剩成7個(gè)了,也與3)矛盾,所以也排除

  7:所以很顯然,我只能抽剩1,4,7

  8:因?yàn)橹荒艹楹笫?,4,7才能贏,我先抽得話不可能達(dá)到這幾個(gè)數(shù),很顯然,只能讓對(duì)

  方先抽,也即是先抽的人輸


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