mongols | C++ high performance networking | HTTP library
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A high performance network library for c++:.
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QUESTION
When trying to enter scanf(" %[^\n]%*c", &answer);
the program hangs for a second and then closes, what can I do to fix this.
I have tried with and without the &
, with differing ways of taking in whitespace and in different places. This did work before I included the array *aarray[]
and had the while loop inside of the switch statement, (in the full code there are multiple cases with different questions and I didn't want to create a while loop in each one.)
ANSWER
Answered 2019-Jan-25 at 18:54scanf(" %[^\n]%*c", answer);
is trying to write a string to an uninitialized, unallocated (and more importantly) incomplete pointer of type void *
.
You need to declare it as a complete type (i.e. char *
) and allocate memory for it, either on the stack by explicitly declaring array size [LEN]
or dynamically with malloc(LEN)
and later free
it.
QUESTION
I'm attempting to make a 2D array which would store a question and an answer in each row of the array, what do I need to do to set this up, as well as be able to call rows from this array.
I have tried to change the brackets to the right of the array name (eg. [15][2], [15], no brackets), and looked at a few stackoverflow problems which don't quite work for my problem. I am also getting the "subscripted value is neither array nor pointer nor vector" error when on the 'H' case of the switch statement. I am also getting several "braces around scalar initializer", "excess elements in scalar initializer" and "makes integer from pointer without a cast [-Wint-conversion]" warnings during loading. I apologize if I made any obvious mistakes I'm coming to C from Python and still trying to wrap my head around it.
...ANSWER
Answered 2019-Jan-03 at 17:34you are initializing a char array with a list of string literals. What you want is an array of pointers.
For example:
QUESTION
I am trying to pass props from two arrays that are contained in the state of the react component. One array is generated by the user and the other is already built in. This is a bit over my head as I'm still new to React and am unsure how to correctly pass props.
There are no errors here in the component, it's just that I don't know how to do it.
I will explain below what I'm looking for, any help would be greatly appreciated
Main Component
In this.state
below you will see questions
(which works perfectly) then hints
. Questions is mapped over correctly however when I try to add in hints to map along with it, it returns all of the hints at once instead of in order and one by one. I've tried just adding (questions, hints)
but it doesn't return it correctly.
ANSWER
Answered 2017-Aug-06 at 13:23the function in map
has an optional second param, the index of the current element so you could do:
QUESTION
I have a component that when the user hits submit (or enter) a new question is presented with a text input, the users enters in an answer and hits submits (this repeats until the final question is answered).
All works except that it's not focusing no matter if I add a ref or autofocus. I'm unsure what to do at this juncture and can't seem to get it to work no matter what I try.
Could I get some assistance on, when the user hits submit, it focuses on the next text input. I'm using styled components below in my code so the text input would be inputStyle
ANSWER
Answered 2017-Aug-05 at 13:46For fixing consider the following
- Since you are hiding each question using display:none, they are still rendered into the DOM, thus every ref will be executed regardless of which question you are on. You are assigning to this.textInput so this.textInput will only ever have input7's element.
- For the same reason, autofocus probably won't work very well as I believe this fires when a react component is added to the DOM, not made visible with css.
If I were you I would have a renderQuestion(step) method with a switch statement in, which returns the JSX for each case of step. Call this after the form element in your main render method with {this.renderQuestion(step)}, do the switch and this way only the active question will be rendered into the DOM. This may help making autoFocus work, I'm not sure. But to be more explicit, ref will now work properly and you can simply do
QUESTION
C:\Users\Archie Jugdersuren\summaproject_trial3 - Copy 6 - heroku2>git push
heroku master
Counting objects: 3247, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (3049/3049), done.
Writing objects: 100% (3247/3247), 3.88 MiB | 496.00 KiB/s, done.
Total 3247 (delta 811), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Node.js app detected
remote: parse error: Expected another key-value pair at line 20, column 3
remote: ! Unable to parse package.json
remote:
remote:
remote: -----> Build failed
remote: parse error: Expected another key-value pair at line 20, column 3
remote: parse error: Expected another key-value pair at line 20, column 3
remote:
remote: We're sorry this build is failing! You can troubleshoot
common issues here:
remote: https://devcenter.heroku.com/articles/troubleshooting-node-
deploys
remote:
remote: If you're stuck, please submit a ticket so we can help:
remote: https://help.heroku.com/
remote:
remote: Love,
remote: Heroku
remote:
remote: ! Push rejected, failed to compile Node.js app.
remote:
remote: ! Push failed
remote: Verifying deploy...
remote:
remote: ! Push rejected to summ2.
remote:
To https://git.heroku.com/summ2.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/summ2.git'
...ANSWER
Answered 2017-Aug-03 at 19:11Did you recommit your changes before pushing to heroku? Most answers regarding this question are a result of a missing or extra comma somewhere, I suggest putting your code through a json parser and checking to make sure you have all valid json.
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