C++程序设计实践指导1.9统计与替换字符串中的关键字改写要求实现

改写要求1：将字符数组str改为字符指针p，动态开辟存储空间

改写要求2：增加统计关键字个数的函数void CountKeyWords()

改写要求3: 增加替换函数void FindKeyWords()

#include <cstdlib>

#include <iostream>

#include <string>

using namespace std;



class WORDNUM

{

      char *p;

      double c;

      public:

             WORDNUM(char *s)

             {

                 p=new char[strlen(s)];

                 strcpy(p,s);

                 c=0;

             }

             void process();

             void CountKeyWords(string key[],int len);

             void FindKeyWords(string key[],string swapkey[],int len);

             void print()

             {

                  char* r=new char[strlen(p)];

                  strcpy(r,p);

                  while(*r!='\0')

                  cout<<*(r++);

                  cout<<endl;

                  cout<<"num="<<c<<endl;

             }

};



void WORDNUM::CountKeyWords(string key[],int len)

{

     int i=len;

     while(i)

     {

     double sameword=0;

     char* r=new char[strlen(p)];

     strcpy(r,p);

     char* q=new char[key[i-1].length()];

     strcpy(q,key[i-1].c_str());

     char* find=strstr(r,q);

     while(find)

     {       

            memset(find, ' ', strlen(q));

            sameword++;

            find=strstr(find,q);

    

     }

      

     cout<<key[i-1]<<"的个数为："<<sameword<<"占全部字符"<<(sameword/c)*100<<"%"<<endl;

     i--;

     }

}



void WORDNUM::FindKeyWords(string key[],string swapkey[],int len)

{

   int i=len;

   string temp;

   temp=p;

   int pos=temp.find(key[i-1]);

   while(i)

   {

     while(pos!=-1)

     {       

            temp.replace(pos,key[i-1].length(),swapkey[i-1]);

            pos=temp.find(key[i-1]);

    

     }

     i--; 

   } 

   memset(p,0,sizeof(p));

   strcpy(p,temp.c_str());

}



void WORDNUM::process()

{

     int word=1;

     int len;

     len=strlen(p);

     char* r=new char[strlen(p)];

     strcpy(r,p);

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

     {

             if(((r[i]>='a'&&r[i]<='z')||(r[i]>='A'&&r[i]<='Z'))&&word)

             {

                   c++;

                   word=0;

             }

             else if(r[i]==' ')

                      word=1;

     }

}



int main(int argc, char *argv[])

{

    string key[2]={"nice","girl"};

    string swapkey[2]={"ugly","boy"};

    int len=sizeof(key)/sizeof(key[0]);

    string str="She is a nice nice girl girl girl hi";

    char* split=new char[strlen(str.c_str())];

    strcpy(split,str.c_str());

    WORDNUM w(split);

    w.process();        

    w.CountKeyWords(key,len);

    w.print();

    w.FindKeyWords(key,swapkey,len);

    w.print();

    system("PAUSE");

    return EXIT_SUCCESS;

}