Any chances for cin>> filling automatically in CPP program

Question

1.00/5 (2 votes)

See more:

C++

#include<iostream>
using namespace std;

int main()
{
    int a, b;
    cout<<"Enter the Roll_No : ";
    cin>>a;
}

Here, without user enter it manually, have to fill automatically.

is that possible?....

What I have tried:

Any chances for variable fill automatic without user enter manually

Posted 5-Jan-22 2:02am

maathesh

Updated 5-Jan-22 3:38am

Dave Kreskowiak

v3

Add a Solution

Comments

OriginalGriff 5-Jan-22 8:08am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with - we get no other context for your project.
Imagine this: you go for a drive in the country, but you have a problem with the car. You call the garage, say "it broke" and turn off your phone. How long will you be waiting before the garage arrives with the right bits and tools to fix the car given they don't know what make or model it is, who you are, what happened when it all went wrong, or even where you are?

That's what you've done here. So stop typing as little as possible and try explaining things to people who have no way to access your project!

Use the "Improve question" widget to edit your question and provide better information.

Stefan_Lang 5-Jan-22 8:35am

std::cin reads from console input, and that means the user. That is the whole point of std::cin, so if you want to get input from somewhere else, you should use a different input device, e. g. a file (see std::fstream) or maybe an input data stream from an internet connection.

When you say, 'fill automatic', then what is doing the 'automatic' filling? What is the source? What or who decides how the filling is done?

We can only advise you on doing such a thing if you are more specific on what you have in mind.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

_Asif_ · Answer 1 · 2022-01-05T02:34:00

Solution 1

There is an article present below that can give you a starting point.

Idea is to get keyboard keys as you type in and do whatever you want, however you manually need to check enter and linefeed characters.

I made some getch like functions for you - C++ Forum[^]

Posted 5-Jan-22 2:34am

_Asif_