C + + Primer exercises 8.9 ifstream How to use

1#include <iostream>2#include <fstream>3#include <vector>4#include <string>5 6 using namespacestd;7 8ifstream& ReadLine (ifstream&inch, vector<string> &veclines)9 {Ten     stringLine ; One      while(!inch. EOF ()) A     {     -Getlineinch, line); -cout<<line<<Endl; the Veclines.push_back (line); -     } -     return inch; - } +ifstream& Readstr (ifstream&inch, vector<string> &vecstrs) - { +     stringstr;  A      while(!inch. EOF ()) at     {     -         inch>>str;  -cout<<str<<Endl; - vecstrs.push_back (str); -     } -     return inch; in } - intMain () to { +Ifstream InFile ("1.txt"); -     if(!inFile) the         return-1; *vector<string>Veclines; $ ReadLine (infile,veclines);Panax Notoginseng infile.close (); - infile.clear (); theInfile.open ("1.txt"); +     if(!inFile) A         return-1; thevector<string>Vecstrs; + readstr (infile,vecstrs); - infile.close (); $ infile.clear (); $     return 0; -}

Summarize:

(1) Ifstream uses Getline to get a row of elements within a file.
(2) Ifstream inheritance IStream can use >> to get a single string.

Results:

C + + Primer exercises 8.9 ifstream How to use