Re: how stdin stream works?

[Flade via Digitalmars-d-learn]

On Thursday, 20 August 2020 at 19:13:31 UTC, Ali Çehreli wrote:
On 8/19/20 11:46 AM, Flade wrote:
[...]

Thanks Steve! I will get the input a string then as you said 
and then I'll try to convert it! Thanks a lot, have a nice day!

In some cases clearerr() and readln() may be what is needed:

import std.stdio;

void main() {
  int x;

  bool accepted = false;

  while (!accepted) {
    try {
      write("x: ");
      readf(" %d", x);
      accepted = true;

    } catch (Exception msg) {

      writeln("Please give a right coordinate");
      stdin.clearerr();
      stdin.readln();
    }
  }

  writeln("x is ", x);
}

Note that I used " %d" because "%d/n" would not clean when 
nothing was input by just hitting the Enter key. A space 
character in the format string means "read and ignore any 
whitespace at this point" and I like it. :)

Also note I changed the name of the variable as 'accepted'. :)

Ali

Wait! Oh man I just checked your name!!!! I'm currently reading 
your book and I wanted to say that you did an EXCELLENT work and 
I love it! Thanks a lot! You are great!!!