《C++primer》第八章课后习题
练习8.1
istream& abc(istream& is)
{string s;is >> s;cout << s;s.clear();return is;
}
练习8.2
abc(cin);
练习8.3
答：输入类型与i不符，或者输入结束标识
练习8.4
vector<string> s;
void abc(string s1)
{string s2;ifstream in(s1);while(getline(in, s2))s.push_back(s2);
}
练习8.5
vector<string> s;
void abc(string s1)
{string s2;ifstream in(s1);while(in>>s2)s.push_back(s2);
}
练习8.6
略
关于书店程序，lz在这里就不写了，想具体了解的同学请看原书。
练习8.9
istringstream& abc(istringstream& is)
{string s;is >> s;cout << s;s.clear();return is;
}
练习8.10
vector<string> s;
void abc(string s1)
{string s2;ifstream in(s1);while (getline(in, s2)){s.push_back(s2);istringstream is(s2);is >> s2;}
}
练习8.11
string line,word;
vector<PersonInfo> people;
getline(cin,line);
istringstream record(line);
while(getline(cin,line))
{PersonInfo info;record>>info.name;//读取名字while(record>>word)//读取电话号码info.phones.push_back(word);//保持他们people.push_back(info);//将此纪录追加到people末尾
}
练习8.12
答：因为希望用默认初始化
练习8.13
string line,word;
vector<PersonInfo> people;
ifstream in("filename");
while(getline(in,line))
{PersonInfo info;istringstream record(line);record>>info.name;while(record>>word)info.phones.push_back(word);people.push_back(info);
}
练习8.14
答：因为不想无意间修改他们的值。