Question

我在C ++ Primer中做了一个练习，它说我需要在循环外定义std::istringstream record;所以当我测试它时我会这样做第一个输出没问题但是第二个，第三个似乎它没有在info.name和word存储任何值这里的代码

#include <iostream>
#include <vector>
#include <sstream>

struct PersonInfo {
std::string name;
std::vector <std::string> phones;
};

int main()
{
std::string line, word;
std::vector <PersonInfo> people;
std::istringstream record;

 while (std::getline (std::cin, line)) {
   PersonInfo info;

   record.str(line);

   record >> info.name;

   std::cout << info.name << std::endl;

   while (record >> word) {
         info.phones.push_back (word);
         std::cout << word << std::endl;
   }

   people.push_back (info);

}

for (unsigned i = 0; i != people.size(); ++i) {
     std::cout << people[i].name << " ";
      for (unsigned z = 0; z != people[i].phones.size(); ++z) {
        std::cout << people[i].phones[z] << " ";
      }
      std::cout << std::endl;
}

return 0;
}

但是当我在外部循环中定义std::istringstream record;时似乎没问题。

Answer 1

那是因为它达到了EOF。源材料是错误的，或者说是record.clear()以清除错误标记，并且您没有正确遵循说明。

在循环外定义std :: istringstream记录

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