How to save a input string in C++?

Question

#include<iostream>
#include<string>
#include<fstream>
using namespace std;

int main()
{
  ofstream wysla;
  wysla.open("wysla.txt", ios::app);
  int kaput;
  string s1,s2;
  cout<<"Please select from the List below"<<endl;
  cout<<"1.New entry"<<endl;
  cout<<"2.View Previous Entries"<<endl;
  cout<<"3.Delete an entry"<<endl;
  cin>>kaput;
  switch (kaput)
  {
    case 1:

      cout<<"Dear diary,"<<endl;
      getline(cin,s1);
      wysla<<s1;
      wysla.close();

      break;
   }
   return 0;
}

In this code I have tried to save a string of characters but it is not possible e.g,.. when I use getline nothing is saved on the text file when I use cin only the first word is saved. I would like to save the whole entry what do I do?

masoud · Accepted Answer · 2013-04-26 09:45:47Z

6

Use cin.ignore() after cin >> kaput; to remove \n from buffer.

cin >> kaput;
cin.ignore();

Extracts and discards characters from the input stream until and including delim.

As the comment, you'd better to use

cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

edited Apr 26, 2013 at 9:45

answered Apr 26, 2013 at 9:39

masoud

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3 Comments

Armen Tsirunyan Over a year ago

I would use cin.ignore(std::numeric_limits<std::streamsize>::max(),'\n'); because if the user had input 4 and then two spaces and then enter, this wouldn't work

Wysla Over a year ago

good idea but in my main program wen i use cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); it brings up some errors though the first answer works

masoud Over a year ago

@Wysla: If think to solve those errors you should #include <limits> because of std::numeric_limits.

Werner Henze · Accepted Answer · 2013-04-26 09:40:56Z

0

You might need to insert a cin.ignore() after cin >> kaput to read the newline character at the end of the first input. Otherwise getline sees this newline as the first character, consumes it and ends reading.

answered Apr 26, 2013 at 9:40

Werner Henze

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Comments

Nemanja Boric · Accepted Answer · 2013-04-26 09:42:58Z

0

When you enter the number, number will be read into kaput variable, but '\n' character will still be in the buffer, which will be read by getline). To resolve this issue you need to call cin.ignore() to remove newline character from the stdin buffer

answered Apr 26, 2013 at 9:42

Nemanja Boric

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Comments

Vivek Jain · Accepted Answer · 2020-08-02 12:14:04Z

0

This can work :

    #include<iostream>
    #include<string>
    #include<fstream>
    using namespace std;

    int main() {
       string firstname;
       ofstream name;
       name.open("name");
       cout<<"Name? "<<endl;
       cin>>firstname;
       name<<firstname;
       name.close();
    }

edited Aug 2, 2020 at 12:14

Vivek Jain

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answered Aug 2, 2020 at 7:00

FineCoder2120

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