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digitalmars.D.learn - Why does this not work?

reply TheDGuy <loder.feuer googlemail.com> writes:
     writeln("Which number should i guess?");
	string input = readln();
	int i = to!int(input);
Jan 01 2016
next sibling parent reply Tobi G. <gruen_tobias web.de> writes:
On Friday, 1 January 2016 at 14:00:41 UTC, TheDGuy wrote:

     writeln("Which number should i guess?");
 	string input = readln();
 	int i = to!int(input);


The solution is that readln() returns a string that also contains 
the newline
this can be solved by easily stripping the newline off

import std.string;

int i = to!int(input.strip);
Jan 01 2016
parent reply Tobi G. <gruen_tobias web.de> writes:
On Friday, 1 January 2016 at 14:20:26 UTC, Tobi G. wrote:

 The solution is that readln() returns a string that also 
 contains the newline
 this can be solved by easily stripping the newline off

 import std.string;

 int i = to!int(input.strip);


Sorry my bad english.. i wrote solution but meant problem
Jan 01 2016
parent reply TheDGuy <loder.feuer googlemail.com> writes:
On Friday, 1 January 2016 at 14:29:34 UTC, Tobi G. wrote:

 On Friday, 1 January 2016 at 14:20:26 UTC, Tobi G. wrote:

 The solution is that readln() returns a string that also 
 contains the newline
 this can be solved by easily stripping the newline off

 import std.string;

 int i = to!int(input.strip);


 Sorry my bad english.. i wrote solution but meant problem


Thank you very much! That helped me alot. It is kind of hard if 
you don't have the background knowledge...
Jan 01 2016
parent reply bachmeier <no spam.net> writes:
On Friday, 1 January 2016 at 14:47:20 UTC, TheDGuy wrote:

 On Friday, 1 January 2016 at 14:29:34 UTC, Tobi G. wrote:

 On Friday, 1 January 2016 at 14:20:26 UTC, Tobi G. wrote:

 The solution is that readln() returns a string that also 
 contains the newline
 this can be solved by easily stripping the newline off

 import std.string;

 int i = to!int(input.strip);


 Sorry my bad english.. i wrote solution but meant problem


 Thank you very much! That helped me alot. It is kind of hard if 
 you don't have the background knowledge...


I've battled with a few times, not having any idea what was going 
on. I now almost automatically use strip when it's not working.
Jan 01 2016
parent reply Adam D. Ruppe <destructionator gmail.com> writes:
On Friday, 1 January 2016 at 15:06:53 UTC, bachmeier wrote:

 I've battled with a few times, not having any idea what was 
 going on. I now almost automatically use strip when it's not 
 working.


This is one of the most frequently asked questions by new users.. 
I added a tip to my new docs:

http://dpldocs.info/experimental-docs/std.stdio.readln.html

If you were looking at that for the first time, would you notice 
it? If no, I can see about moving it or rewording it or something.
Jan 01 2016
next sibling parent reply TheDGuy <loder.feuer googlemail.com> writes:
On Friday, 1 January 2016 at 15:16:36 UTC, Adam D. Ruppe wrote:

 On Friday, 1 January 2016 at 15:06:53 UTC, bachmeier wrote:

 I've battled with a few times, not having any idea what was 
 going on. I now almost automatically use strip when it's not 
 working.


 This is one of the most frequently asked questions by new 
 users.. I added a tip to my new docs:

 http://dpldocs.info/experimental-docs/std.stdio.readln.html

 If you were looking at that for the first time, would you 
 notice it? If no, I can see about moving it or rewording it or 
 something.


If i had known that blog existed. I think your example at the end 
of the page explains the problem really well.
Thanks!
Jan 01 2016
parent Adam D. Ruppe <destructionator gmail.com> writes:
On Friday, 1 January 2016 at 17:00:23 UTC, TheDGuy wrote:

 If i had known that blog existed. I think your example at the 
 end of the page explains the problem really well.
 Thanks!


I just wrote that example in response to this thread :P (the 
overall thing there is something i started last week to 
reorganize the official docs to be easier to read and edit)


But it is a common enough question that it should just be in the 
documentation.
Jan 01 2016
prev sibling parent bachmeier <no spam.net> writes:
On Friday, 1 January 2016 at 15:16:36 UTC, Adam D. Ruppe wrote:

 On Friday, 1 January 2016 at 15:06:53 UTC, bachmeier wrote:

 I've battled with a few times, not having any idea what was 
 going on. I now almost automatically use strip when it's not 
 working.


 This is one of the most frequently asked questions by new 
 users.. I added a tip to my new docs:

 http://dpldocs.info/experimental-docs/std.stdio.readln.html

 If you were looking at that for the first time, would you 
 notice it? If no, I can see about moving it or rewording it or 
 something.


If the user is reading the docs completely, yes, it is clear. It 
would probably be better to put it in its own section, because a 
user might not expect to find an explanation of a pitfall in 
there, and because it makes it easy to find when you're looking 
the second or third time.
Jan 01 2016
prev sibling parent israel <tl12000 live.com> writes:
On Friday, 1 January 2016 at 14:00:41 UTC, TheDGuy wrote:

     writeln("Which number should i guess?");
 	string input = readln();
 	int i = to!int(input);




According to Ahli. You have to use the old C way of doing it with 
readf.
Jan 01 2016