Thanks. I thought that so, but I swear I remember something being inconclusive. Must be remembering things ~.~.
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Programming |OT| C is better than C++! No, C++ is better than C
- Thread starter Kikarian
- Start date
Thanks. I thought that so, but I swear I remember something being inconclusive. Must be remembering things ~.~.
You may have stated parts 2 & 3 incorrectly.
If you find a polynomial-time solution to B, then P = NP.
If you find a polynomial-time solution to A, it's inconclusive.
Programming newb here:
A user types a word and a number. Read them into the provided variables. Then print: word_number. End with newline. Example output if user entered: Amy 5
Amy_5
How do I assign a value into a string when the variable is an Int?
A user types a word and a number. Read them into the provided variables. Then print: word_number. End with newline. Example output if user entered: Amy 5
Amy_5
Code:
import java.util.Scanner;
public class SpaceReplace {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
String userWord = "";
int userNum = 0;
String sentenceWord = "";
String sentenceNum = "";
System.out.print("Enter a Word");
userWord = scnr.next();
System.out.print("Enter a Number");
userNum = scnr.nextInt();
sentenceWord = userWord;
sentenceNum = IntuserNum; //Ithink this is the problem
System.out.print(sentenceWord);
System.out.print("_");
System.out.println(sentenceNum);
return;
}
}How do I assign a value into a string when the variable is an Int?
notoriousKTR
Member
See: https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#parseInt(java.lang.String)
edit...never mind, you want the other way around.
A quick and dirty way is to do:
Code:
int i = 10;
string s = "" + i;or see the post below.
So for anyone wanting to have their dependencies/references merged into the assembly in .NET, I've found and easy solution. There's alternatives, but the Costura.Fody NuGet package works without hassle. Just installed it on all my projects, and everything gets nicely combined into one file. Doesn't fix the sub-dependency access, and I think the assemblies get embedded instead of actually merged, but hey, at least it works without hassle.
Lately I've been having an issue with app crashes in Android Studio. I don't know if this is Android specific or Java in general.
Instead of getting my normal crash with some sort of error in Logcat, I'm just getting "Shutting Down VM". Now, with extensive Log statements I can usually find the issue, but it has made the process much longer. I cannot remember what I did when this started happening, but I used to get normal error statements in this same project at one point in time.
Anyone have any idea what could be going on?
Instead of getting my normal crash with some sort of error in Logcat, I'm just getting "Shutting Down VM". Now, with extensive Log statements I can usually find the issue, but it has made the process much longer. I cannot remember what I did when this started happening, but I used to get normal error statements in this same project at one point in time.
Anyone have any idea what could be going on?
well, damn me. that must've been it. Thanks.
Nice video, explains things well. Thanks.
What are the differences between linters and syntax checkers in say an IDE like IntelliJ?
I'm keep seeing people talk about how awesome this linter or that linter are, especially in the context of Sublime Text, but whenever I think about them and what they do I keep picturing an IDE. Like they are doing what an IDE would already do for you, just in a less efficient way.
Please set me straight and explain these things if you could!
I'm keep seeing people talk about how awesome this linter or that linter are, especially in the context of Sublime Text, but whenever I think about them and what they do I keep picturing an IDE. Like they are doing what an IDE would already do for you, just in a less efficient way.
Please set me straight and explain these things if you could!
It's usually setup as part of the build process. It would be silly for an IDE to prevent you from saving code that's not properly linted but you don't want to check it in to version control and not everybody is using the same IDE with the same style rules.
Hmm, so are they more popular with larger teams using source control? I'm still ignorant on the big team workings of software development.
These are nicely done.
1) Syntax checking is just a part of what compilers do. Compilers have to be very fast to be useful in day-to-day development. Separate linters / static analysis tools can take a lot more time to perform deeper analysis that compilers cannot do.
2) Purpose. Linters may look heuristically for things that might not even be errors, style issues that are only relevant in the context of a particular project's / team's agreed coding style, etc. Integrating all of these features into a giant monolithic compiler as optional features that take no performance when disabled would be a miracle and at least make the compiler unmaintainable.
Poster's talking about IDE's though, not compilers. From the sounds of it I'd never use something like atom + linter when a full fledged IDE is available. Unless the functionality is comparable, but it's not though is it?
And all linters do that? A linter has integrated GIT? What about project package and build management? Debugging?
A linter is just a code analysis tool that takes in the source code files and spits back a bunch of warnings kinda like a compiler would but it's checking more for style than syntax. So in a normal team scenario you have a build process that gets latest from the repository, compiles the build, pushes it up to a clean environment for testing, and runs automated test, typically on a check in. This is to test if the checked in code broke something and if it did it usually flags the build as bad (noting the last check in) and the team should stop what they are doing and fix it. This way you don't check in broken code and take off, leaving everyone else with a broken build they can't work with. As part of this many teams opt to include code linters that check for style and form issues.
It's still recommended you run the linter locally but it's a line of defense to keep code quality high.
moka
Member
Pre-commit builds!
Elfforkusu
Member
Linters are probably most useful for a JIT-style language, e.g. your pythons/javascript/ruby where you don't have a compiler to tell you you made stupid syntax errors. The linter can catch those...
It also serves as the dual-purpose of keeping code style in sync + enforcing some best practices across a team of devs.
It also serves as the dual-purpose of keeping code style in sync + enforcing some best practices across a team of devs.
Im on chapter 4 and I am looking at looping. The section of the book covers break and continue.
"Simon Says" is a memory game where "Simon" outputs a sequence of 10 characters (R, G, B, Y) and the user must repeat the sequence. Create a for loop that compares the two strings starting from index 0. For each match, add one point to userScore. Upon a mismatch, exit the loop using a break statement. Ex: The following patterns yield a userScore of 4:
simonPattern: R, R, G, B, R, Y, Y, B, G, Y
userPattern: R, R, G, B, B, R, Y, B, G, Y
I keep getting this error:
I am just not sure what I am doing wrong for the else if statement.
"Simon Says" is a memory game where "Simon" outputs a sequence of 10 characters (R, G, B, Y) and the user must repeat the sequence. Create a for loop that compares the two strings starting from index 0. For each match, add one point to userScore. Upon a mismatch, exit the loop using a break statement. Ex: The following patterns yield a userScore of 4:
simonPattern: R, R, G, B, R, Y, Y, B, G, Y
userPattern: R, R, G, B, B, R, Y, B, G, Y
Code:
import java.util.Scanner;
public class SimonSays {
public static void main (String [] args) {
String simonPattern = "";
String userPattern = "";
int userScore = 0;
int i = 0;
userScore = 0;
simonPattern = "RRGBRYYBGY";
userPattern = "RRGBBRYBGY";
char s;
char u;
for(i=0; i < 10; i++) {
s = simonPattern.charAt(i);
u = userPattern.charAt(i);
if(s == u)
userScore = userScore + 1;
continue;
else if(s != u){
break;
}
System.out.println("userScore: " + userScore);
return;
}
}I keep getting this error:
Code:
SimonSays.java:24: 'else' without 'if' else if(s != u){ ^ SimonSays.java:34: reached end of file while parsing } ^ 2 errorsI am just not sure what I am doing wrong for the else if statement.
Chainsawkitten
Member
This is your code with proper indentation. An if-statement only applies to the one next statement after it. If you want multiple statements, you need to use brackets.
Brackets are your friend. Else statements need to immediately follow the if. For multi line ifs you are going to want brackets
Also not a fan. It's a scripting language often used for hacking quick tasks, and gives you the flexible data containers you would expect from such a language but makes accessing elements of those containers (dereferencing) primitive. Maybe I'm a dummy, but I still find dereferencing to access elements in deeply-nested lists (or hashes, or lists of hashes, or lists of hashes of hashes...) to be quite onerous.
So question here regarding class generation in C# / VS. I want to be able to write an interface, and have that interface implemented at compile time, or before, automatically.
The implementations of the methods are all according to the same procedure, all information I need per method is the method's name and parameters and then I can write the body. I also need to be able to generate two different implementations per interface (client and server).
What would you suggest, T4 Templates, Reflection.Emit? Are there any other options (built in to VS preferably)?
The implementations of the methods are all according to the same procedure, all information I need per method is the method's name and parameters and then I can write the body. I also need to be able to generate two different implementations per interface (client and server).
What would you suggest, T4 Templates, Reflection.Emit? Are there any other options (built in to VS preferably)?
cpp_is_king
Member
I know this doesn't answer your question, but have you considered using something like Cap'n Proto. Because it sounds like you're re-inventing the wheel.
Looks really cool, simply storing the data beforehand in a way that you can just write/transfer it. But the RPC part isn't available in C#. Doesn't seem like it does what I need it to do either, waiting for the reply part for example seems to be blocking. As for the serialization part, I don't want to use schema's for this project. Streamlining the development process has a higher priority. 2 to 5x the speed of protobuf is insane though, definitely one to watch.
The serialization and messaging is already implemented by the way and I'm working on streamlining client-server RPC interfaces. That's why I need to generate classes from an interface, so the developer would only have to edit the interface and then regenerate the classes. Perhaps even at runtime, but then the syntax can't be checked.
cpp_is_king
Member
Ahh, well in that case if it were me I would create a very simple DSL and then write a tool to generate the classes. You could even make it JSON, like this:
Code:
'client' : {
'methods' : [
{
'return_type' : 'void'
'name' : 'foo'
'args' : [
{
type : 'int',
name : 'foo_param'
}
]
},
{
'return_type' : 'double'
'name' : 'bar'
'args' : [
{
type : 'float',
name : 'bar_param'
}
]
}
]
}Then write a little command line tool that uses JSON.NET to parse this file and output a C# class.
To integrate this into VS, first split your project so that the interface is in a separate assembly. Then add all these JSON files to this same project. For each of the JSON files, set the build action to Custom Build Tool and set the command line to run the tool you wrote. Then have the main project add a reference to this project.
Now everything will just be automatic.
Had to use it for my programming paradigms class mostly for regular expressions. I was also not a fan of it at all, never used it ever since.
Hm yeah, sort of like an extension as well. Though I don't want to write outside of the IDE/language. But if I write is as VS extension I could use a normal C# interface as well. I guess I'm trying to decide between that (most flexibility, but also most effort), T4 Templates (I think the options here are limited right?) and runtime with Reflection.Emit/Expression trees (less syntax checking, but also least amount of steps for developer to take).
Kind of leaning towards Emit/Expression trees now. Seems like it would be neat to just provide an interface to the RPC object and out pops an instance you can use. Everything happening in the background. Eh can't seem to make up my mind
I recently bought a book called Head First Java which is amazing!
close to the edge
Member
Does anyone here have experience with d3.js? I've been messing around with it today and it's really cool and seems extremely powerful, but I've got issues trying to get an ordinal scale for a histogram working. I've posted my code on JSBin. The issue seems to be that the ordinal scale always returns undefined, even though I've defined an input mapping (domain(weekdays)) and an output range. Not sure what the problem is exactly, I'm still very new to the library.
Anybody help me with this?
Write a loop that sets each array element to the sum of itself and the next element, except for the last element which stays the same. Be careful not to index beyond the last element. Ex:
Initial scores: 10, 20, 30, 40
Scores after the loop: 30, 50, 70, 40
The first element is 30 or 10 + 20, the second element is 50 or 20 + 30, and the third element is 70 or 30 + 40. The last element remains the same.
I got the answer correct but I keep getting this error and I am not sure what is wrong exactly
Write a loop that sets each array element to the sum of itself and the next element, except for the last element which stays the same. Be careful not to index beyond the last element. Ex:
Initial scores: 10, 20, 30, 40
Scores after the loop: 30, 50, 70, 40
The first element is 30 or 10 + 20, the second element is 50 or 20 + 30, and the third element is 70 or 30 + 40. The last element remains the same.
Code:
public class StudentScores {
public static void main (String [] args) {
final int SCORES_SIZE = 4;
int[] bonusScores = new int[SCORES_SIZE];
int i = 0;
bonusScores[0] = 10;
bonusScores[1] = 20;
bonusScores[2] = 30;
bonusScores[3] = 40;
/* Your solution goes here */
for(i=0; i < 3; ++i){
bonusScores[i] = bonusScores[i] + bonusScores[i+1];
}
for (i = 0; i < SCORES_SIZE; ++i) {
System.out.print(bonusScores[i] + " ");
}
System.out.println();
return;
}
}I got the answer correct but I keep getting this error and I am not sure what is wrong exactly
Code:
Testing for bonusScores = {10, 20, 30, 40}
Your output:30 50 70 40
✖ Runtime error (commonly due to an invalid array/vector access, divide by 0, etc.).
Tests aborted.Nothing wrong with your code. How is it tested? Where does the runtime error message come from?
Some advice on code style, though: You're using a constant number in the termination condition of the first loop. If the size of the array ever changes, you'd have to modify two lines (the SCORES_SIZE constant and the 3 in the loop head). So you should replace the 3 with SCORES_SIZE-1. Second: The return statement is unnecessary. It's the last line of the method, so it's going to return anyway.
cpp_is_king
Member
Hm yeah, sort of like an extension as well. Though I don't want to write outside of the IDE/language. But if I write is as VS extension I could use a normal C# interface as well. I guess I'm trying to decide between that (most flexibility, but also most effort), T4 Templates (I think the options here are limited right?) and runtime with Reflection.Emit/Expression trees (less syntax checking, but also least amount of steps for developer to take).
Kind of leaning towards Emit/Expression trees now. Seems like it would be neat to just provide an interface to the RPC object and out pops an instance you can use. Everything happening in the background. Eh can't seem to make up my mind
Hmm, idk, it seems like the JSON approach I suggested involves very few steps for a developer to take, and is also really easy to implement. All the developer has to do is add add a few lines of self-explanatory JSON to an existing file, then hit build, then it just works. Plus it has the advantage of being fast (actual C# code is generated at build time), and easy to debug / step through because no reflection funny business. Why make it a VS extension though? Just make a simple command line tool, add that to the solution, make a dependency on it so that it builds first and put a post build step to output it to some shared location where other projects can invoke it from.
Everything just works, no magic steps for the developer to do. Edit json, hit Build, F5 to run.
Hello peoples, I had a quick question. I did a programming focused bachelor degree but have been in Networking side of IT last 2 years. I wanted to transition back to soft dev side I studied during college, so I am planning on taking a 3 month course from Epicodus in Portland to brush up on concepts/network as well. My question is they have 2 course offerings and wanted to know which you fellows would think would be more valuable:
Course 1: PHP/Javascript/Drupal
Course 2: Ruby/Javascript/Railsl
^Let me know what you guys think
Course 1: PHP/Javascript/Drupal
Course 2: Ruby/Javascript/Railsl
^Let me know what you guys think
Definitely course 2.
BomberMouse
Member
Out of those 2, take course 2. More demand and better paid. Only take 1 if you also have a time machine to 2001.
If possible take a course on iOS/Android development, those are scarce and company are even hiring junior dev for those.
The "hotness" right now is node/iOS/new client side js frameworks (react, angular or ember).
I sorta agree, but sorta disagree. PHP (and Perl) can lead to LAMP stack experience, which is, and will be for quite some time, in demand. Maybe is more of a matter of whether he wants to go more towards back end vs front end dev.
Thank you gentlemen for the advice, I'll go ahead and register for number 2.
andrerobot
Member
Learning Rails, an MVC web framework, is probably better than learning how to use and extend a CMS.
Rails also lets you get some experience working with object oriented design, as everything is OO, from all the language libraries up to the application code that you need to code.
Rails is also a very nice framework to work with, as it handles database migration, dependencies and assets in a sensible way.
Once you get more experience on Ruby, you start writing code that writes code for you, which is probably as good as sex.
With an extension you can generate classes from a context menu, so you don't have to build the project or go outside of VS to gain access to/update the classes.
I'm leaving it for now though. Working on the async RPC now. I decided to have the queries run fully asynchronously, so guess I'll just have to keep the reply delegate around in order to send a reply eventually.
close to the edge
Member
I'd personally always go with 3.x because that's where the cool new stuff happens. 2.7 has been stagnant for a while. Recently,Python 3.5 introduced a couple of cool new features (@-operator for matrix multiplication, async and await and so on) and the most important libraries are compatible. If there is some library that doesn't work, you can go back to 2.7, but if possible I'd choose 3.