C++ Primer 課後習題9.39 統計單詞個數並記錄最大單詞和最短單詞

標籤：

習題9.39： 已知有如下string對象：

string line1 = "We were her pride of 10 she named us:";string line2 = "Benjamin, Phoenix, the Prodigal";string line3 = "and perspicacious perspicacious pacific Suzanne";string sentence = line1 + ‘ ‘ + line2 + ‘ ‘ + line3;

編寫程式計算sentence中有多少個單詞，並指出其中最長和最短的單詞。如果有多個最短或者最長單詞，則將他們全部輸出。

代碼：

 1 #include <iostream> 2 #include <vector> 3 #include <list> 4 #include <string> 5 #include <deque> 6 #include <algorithm> 7 #include <sstream> 8 using namespace std; 9 10 int main(int argc, char **argv)11 {    12     string num("0123456789");13     string alpha("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");14     string alphanum = num + alpha;15     string line1 = "We were her pride of 10 she named us:";16     string line2 = "Benjamin, Phoenix, the Prodigal";17     string line3 = "and perspicacious perspicacious pacific Suzanne";18     string sentence = line1 + ‘ ‘ + line2 + ‘ ‘ + line3;19     stringstream ss;20     ss.str(sentence);21     string str;22     string strMax;23     string strMin;24     vector<string> vStrMax;25     vector<string> vStrMin;26     int sum = 0;27     while (ss>>str)28     {29         sum++;30         string::size_type pos = 0;31         //刪除非字母字元32         while ((pos = str.find_first_not_of(alphanum,pos)) != string::npos)33         {34             str.erase(pos);            35         }36         //比較擷取最大單詞37         if (str.size() > strMax.size())38         {    39             strMax = str;40             vStrMax.clear();41             vStrMax.push_back(str);42         }else if (str.size() == strMax.size())43         {            44             vStrMax.push_back(str);            45         }46         //比較擷取最小單詞，注意strMin第一次大小為047         if (str.size() < strMin.size() || strMin.size() == 0)48         {    49             strMin = str;50             vStrMin.clear();51             vStrMin.push_back(str);52         }else if (str.size() == strMin.size())53         {            54             vStrMin.push_back(str);            55         }        56     }57     return 0;58 }

總結：（1）使用字串流處理字串，擷取單個單詞；

　　　（2）使用string的find_first_not_of()方法除去“，：”非單詞字元。

C++ Primer 課後習題9.39 統計單詞個數並記錄最大單詞和最短單詞