下面是我自己写的程序
#include <iostream>
#include <string>
using std::cin;  using std::cout;
using std::endl; using std::string;
int main()
{
    cout<<"请输入一段话：";
    string chara;
    while(!cin.eof())
       cin>>chara;
   
    const string::size_type n=chara.size();

    for(int i=0;i<n;++i){
        if('A'<=chara[i]&&chara[i]<='Z')
          chara[i]+=32;
         
       //回车换行符用空格来替代
        if(chara[i]=='\r'||chara[i]=='\n'){
        
           chara[i]=' ';
        }
    }
   
    //替换bullshit为bush
    string nmd="bullshit";
    int i=0;
    while(i<=n-nmd.size()+1){
        chara=chara.replace(chara.find("bullshit"),1,"bush");
        ++i;
    }
   
    for(int i=0;i<chara.size();++i){
        int j=1;
        while(chara[i]==' '){
            ++i;
            if(chara[i]==' ')
              ++i;
            ++j;
              
        }
        string space(j,' ');
        string s(1,' ');
        for(int i=0;i<=chara.size()-j+1;++i)
          chara=chara.replace(chara.find(space),1,s);
    }
    for(int i=0;i<chara.size();++i)
        cout<<chara[i];
   
    return 0;
}

[此贴子已经被作者于2016-9-28 13:59编辑过]