答：这里有一份词法分析器C++代码的实现：
// Lexer.h

ifndef LEXER_H

define LEXER_H

include

include

class Lexer { public: Lexer(std::string source); std::vector<std::string> tokenize(); private: std::string source; }; #endif //LEXER_H //Lexer.cpp #include "Lexer.h" #include using namespace std; Lexer::Lexer(string source) { this->source = source; } vector Lexer::tokenize() { vector tokens; istringstream ss(source); string token; while (getline(ss, token, ' ')) { tokens.push_back(token); } return tokens; }