Solved

How to use a default value for a string input from console in ANSI c++

Posted on 2010-11-30
6
460 Views
Last Modified: 2012-05-10
Does anybody knows a standard function in ANSI C++ which accepts a default value of the input value for reading a string from console?

For example I need that the user inputs something like a name but already gets into the console an default name ("John Doe") which he can change. Is there such a function or code block available?




0
Comment
Question by:bfunieru1
  • 3
  • 2
6 Comments
 
LVL 40

Expert Comment

by:evilrix
ID: 34237019
Are you referring to passing the "name" as a command line parameter or maybe reading from stdin when starting the process? You question is a little unclear.

FWIW, there are no "standard" ANSI C++ functions that will do what you ask but once your requirement is understood it shouldn't be too hard to cobble a solution together for you.
0
 

Author Comment

by:bfunieru1
ID: 34237080
The later. Not a command line parameter after program name.

It should be something as what one get from a function as cin or gets.

0
 
LVL 31

Expert Comment

by:Zoppo
ID: 34237383
Hi,

if I understand correctly you want the user to input a name, but if i.e. the user just hits ENTER a default name should be used, right?

If so see the attached code ...

Hope that helps,

ZOPPO
std::string getName( const std::string strDefault )
{
	std::string strName;
	std::cout << "Enter your name [default='" << strDefault << "']: ";
	getline( std::cin, strName );

	if ( false != strName.empty() )
	{
		strName = strDefault;
	}

	return strName;
}

int main(int argc, char* argv[])
{
	std::string strName = getName( "John Doe" );

	std::cout << "Entered name: '" << strName << "'" << std::endl;

	return 0;
\

Open in new window

0
DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

 

Author Comment

by:bfunieru1
ID: 34237441
This solution can also work for sure.
I will prefer if it will be possible to  change something in the default string if for example instead of the short "John Doe" is something much longer which will make new writing very anoying.

0
 

Author Comment

by:bfunieru1
ID: 34237446
To make it more clear it should act similar to a windows textbox which has a default text which one can change or if it is OK just press ENTER and send it.
0
 
LVL 31

Accepted Solution

by:
Zoppo earned 500 total points
ID: 34238796
Sorry, I don't know if such a functionality exists or if it is even possible to do such thing in standard C++.

The problem IMO is that C++'s 'cin' simply retrieves the entered data from the used console (i.e. in Windows 'cmd.exe') - but, any editing functionality is handled by the console, there IMO is no chance to anyhow affect it using and STL functionality.

It may be that you can do something similar as you need using a CURSES library (but i cannot guarantee this since I never used such a library) - see more about this here: http://en.wikipedia.org/wiki/Curses_%28programming_library%29

ZOPPO
0

Featured Post

Back Up Your Microsoft Windows Server®

Back up all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Visual c++ and text files 7 67
Fast, free, private online code repository / editor 7 97
Fully specialized class template function 21 136
convert char array to number in c 5 85
What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question