C++ "cin" only reads the first word

Question

#include<iostream.h>
#include<conio.h>
class String
{
    char str[100];
    public:
    void input()
    {
        cout<<"Enter string :";
        cin>>str;
    }

    void display()
    {
        cout<<str;
    }
};

int main()
{
     String s;
     s.input();
     s.display();
     return 0;
}

I am working in Turbo C++ 4.5. The code is running fine but its not giving the desired output for e.g if i give input as "steve hawking" only "steve" is being displayed. Can anyone please help?

Why are you using a 20 year old IDE? There's a plethora of more modern free IDE's with better compilers (NetBeans, Eclipse, Visual Studio Express, etc.). — Brendan Long, Feb 27 '12 at 17:28

Mike Seymour · Accepted Answer · 2012-02-27T17:35:18.393

Using >> on a stream reads one word at a time. To read a whole line into a char array:

cin.getline(str, sizeof str);

Of course, once you've learnt how to implement a string, you should use std::string and read it as

getline(cin, str);

It would also be a very good idea to get a compiler from this century; yours is over 15 years old, and C++ has changed significantly since then. Visual Studio Express is a good choice if you want a free compiler for Windows; other compilers are available.

Brendan Long · Answer 2 · 2012-02-27T17:28:31.457

4

cin>>str;

This only reads in the next token. In C++ iostreams, tokens are separated by whitespace, so you get the first word.

You probably want getline, which reads an entire line into a string:

getline(cin, str);

edited Feb 27 '12 at 17:28

answered Feb 27 '12 at 17:22

Brendan Long

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so how to get the whole sentence as output ? – rick Feb 27 '12 at 17:24
1

It's 'cin>>str' not 'cin< – xikkub Feb 27 '12 at 17:27

roymustang86 · Answer 3 · 2012-02-27T18:05:02.827

2

You can use :

   cin.read( str, sizeof(str) );

But, this will fill up the buffer. Instead you should use cin.getLine() as MikeSeymour suggested

edited Feb 27 '12 at 18:05

answered Feb 27 '12 at 17:27

roymustang86

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`read` will fill the whole buffer; you want `getline` to read until the end of the line. – Mike Seymour Feb 27 '12 at 17:33
You are right, it will fill the whole buffer. – roymustang86 Feb 27 '12 at 17:35
1

`std::noskipws` doesn't do what you imply. It only affects the *initial* whitespace, not the terminating white space. – Robᵩ Feb 27 '12 at 17:56

score 1 · Answer 4 · edited Feb 27 '12 at 17:41

1

You could use cin.getline to read the whole line.

edited Feb 27 '12 at 17:41

Brendan Long

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answered Feb 27 '12 at 17:32

Qian

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score 0 · Answer 5 · edited Feb 27 '12 at 18:07

0

use this

cin.getline(cin, str);

edited Feb 27 '12 at 18:07

animuson

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answered Feb 27 '12 at 18:01

Stijn

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C++ "cin" only reads the first word

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