统计字符串中的单词数目

//统计字符串中的单词数目——统计字符串中单词的数目，更复杂的话从一个文本中读出字符串并生成单词数目统计结果。/*Test my2test,12test...?tessthehe,dsf..e3234...242haha*///输出结果9#include <iostream>#include <fstream>#include <string>using namespace std;intCountWords(char* filename){ifstream file(filename, ios::in);if (!file.is_open())return -1;string word;int count = 0;int size = 0;int index = 0;int preindex = -1;while (file >> word){for (index = 0, preindex = -1, size = word.size(); index < size; ++index){index = word.find_first_of("0123456789,.?", index);if (index == string::npos)//查找结束{if (preindex == -1 || size > preindex + 1){++count;break;}}else{if (preindex == -1 && index != 0 || index > preindex + 1){++count;}preindex = index;}}}return count;}int main(int argc, char* argv[]){cout << CountWords("D:/test.txt") << endl;system("pause");return 0;}