C++primer 8.3.1节练习
练习8.9
1 #include <iostream> 2 #include <sstream> 3 #include <string> 4 #include <vector> 5 using namespace std; 6 7 istream &readPrint(istream &is); 8 9 istream & readPrint(istream & is) 10 { 11 auto old_state = cin.rdstate(); 12 string i; 13 while (!is.eof()) 14 { 15 is >> i; 16 cout << i << " "; 17 } 18 cin.setstate(old_state); 19 return is; 20 // TODO: 在此处插入 return 语句 21 } 22 23 int main() 24 { 25 string str{"asdhaskdhasd"}; 26 istringstream record(str); 27 readPrint(record); 28 system("pause"); 29 return 0; 30 }
练习8.10
1 #include <iostream> 2 #include <sstream> 3 #include <string> 4 #include <vector> 5 #include <fstream> 6 using namespace std; 7 8 9 int main() 10 { 11 string line, word; 12 vector <string> str; 13 vector <string> str1; 14 ifstream in("title.txt"); 15 ofstream out("answer.txt", ofstream::app); 16 while (!in.eof()) 17 { 18 getline(in, line); 19 str.push_back(line); 20 } 21 for (auto it = str.begin(); it != str.end(); it++) 22 { 23 istringstream record(*it); 24 while ( !record.eof() ) 25 { 26 record >> word; 27 str1.push_back(word); 28 } 29 } 30 for (auto c : str1) 31 out << c << endl; 32 system("pause"); 33 return 0; 34 }
练习8.11
1 #include <iostream> 2 #include <sstream> 3 #include <string> 4 #include <vector> 5 #include <fstream> 6 using namespace std; 7 8 struct PersonInfo { 9 string name; 10 vector<string> phones; 11 }; 12 13 14 int main() 15 { 16 string line, word; 17 PersonInfo info; 18 vector <PersonInfo> people; 19 istringstream record; 20 while (getline(cin, line)) 21 { 22 PersonInfo info; 23 record.str(line); 24 record >> info.name; 25 while (record >> word) 26 info.phones.push_back(word); 27 people.push_back(info); 28 } 29 system("pause"); 30 return 0; 31 }
使用stm.str（s）这个函数，将line的值拷贝到record中；
练习8.12
程序的作用就是往里面写入数据，所以不需要初始化。
