Compiler Problem

This is a discussion on Compiler Problem within the C++ Programming forums, part of the General Programming Boards category; Hi all, I have just started on C++ and am trying to follow the tutorials on this site. However, I've ...

  1. #1
    Registered User
    Join Date
    Apr 2004
    Posts
    14

    Compiler Problem

    Hi all,

    I have just started on C++ and am trying to follow the tutorials on this site. However, I've bumped into a problem. I'm doing the example where the user enters a number and then it is returned. Here is my code.

    Code:
    #include <iostream.h> 
    int
    main() 
    { 
      int thisisanumber; 
      cout<<"Please enter a number:";
      cin>>thisisanumber; 
      cout<<"You entered: "<<thisisanumber;
      cin.get();
      return 0; 
    }
    When I enter my number and press return, the compiler just closes. I've put cin.get(); in, like explained in a tutorial.

    Would it be possible for somebody to help? I've looked in the FAQ but couldn't find anything. I am using Bloodshed.

    Thanks very much,
    Mike

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    Your use of cin leaves a newline in the stream that cin.get() picks up. The easy solution is to add another cin.get(). A somewhat better solution is to use cin.ignore() with a large enough size to handle any length of extraneous input and a delimiter of '\n'. The best solution is to only use getline to read input as a string and then perform conversions once you have the data in memory. Here is one hybrid approach:
    Code:
    #include <iostream> 
    #include <string>
    #include <cstdio>
    
    using namespace std;
    
    int
    main() 
    {
      string buffer;
      int thisisanumber; 
      cout<<"Please enter a number:";
      getline ( cin, buffer );
      sscanf ( buffer.c_str(), "%d", &thisisanumber );
      cout<<"You entered: "<<thisisanumber;
      cin.get();
      return 0; 
    }
    And a more C++ish approach using stringstreams:
    Code:
    #include <iostream>
    #include <string>
    #include <sstream>
    
    using namespace std;
    
    int
    main() 
    {
      string buffer;
      int thisisanumber; 
      cout<<"Please enter a number:";
      getline ( cin, buffer );
      istringstream iss ( buffer );
      iss>> thisisanumber;
      cout<<"You entered: "<<thisisanumber;
      cin.get();
      return 0; 
    }
    My best code is written with the delete key.

  3. #3
    Registered User
    Join Date
    Apr 2004
    Posts
    14
    Yup, works a treat. Thanks Prelude

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