Posts by Maniero • 444,682 points
6,921 posts
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answer77
viewsA: Use of React in backend and small projects
You can integrate the React application with some back end language? React is just a way to manipulate front-end, then all you can do in the front-end is available when you use React, including…
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answers78
viewsA: Questions about database modeling, ID duality
I believe that just change the table to OutraParte or some other neutral name. Even there is an asymmetry because if Reu was the correct name, the other table would be Autor. In a deeper analysis…
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answer247
viewsA: Sonarlint, complexity of the "equals() method"
I hate this kind of tool that puts numbers. 15 is absurdly high in some situations and little in others. To fix this would have to make the code spread (in various methods) without need, it seems to…
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answers283
viewsA: Create list with more than one element as if it were multidimensional
The two solutions presented are bad, one creates a class class and allocates like crazy being inefficient in memory and processing and another makes the element like a dictionary that doesn’t have…
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answers228
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answers928
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answer302
viewsA: Do you have anything like the C# namespaces in Java?
It depends on what you call it. Java has Packages, which can be mistaken as something similar (in fact it contains also the concept of namespace), after all they put a name in front of the guys. In…
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answers171
viewsA: Is APOO useful today?
What matters is to deliver product that meets requirements, among them that: is easily usable (which involves many things, among them the right speed) solves the problem correctly allow evolution…
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answers1223
viewsA: Why don’t you need the `&`in the `scanf();`?
Always :) that you learn that something "always has to be" has something wrong in the learning or in the mechanism, because if you have to put something to get a result, but it may not, it is…
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answer313
viewsA: C/C++ standard libraries
One important thing is that you won’t be able to use it on other compilers and platforms as few implement it. One of the things that people don’t understand that language is something much more than…
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answers718
viewsA: Assign values to arrays
Javascript has some confusing things, one of which is that what you’re using is officially called array, but in practice it’s a table hash, a dictionary, or may even be called array associative.…
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answer77
viewsA: Utility of the coercion operator reinterpret_cast
Knows the cast of other languages, especially C? O cast is just an indication to treat a die of one type as another type, you change a feature to be seen on that object. In some cases this passes…
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answer63
viewsA: What’s the difference if I leave a variable in Otocol marked with Static or without Static in Swift 4?
The specific question for the protocol seems to indicate already knowing why the static in a regular type, such as a class, for example. The reason is the same, it only differs that the protocol is…
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answers224
viewsA: My program made in C++ is in infinite loop, how to fix?
The operator used is wrong, needs to be a <( less than). If you start from 0 and go up to 10, and increment you can not check if the number is greater than a certain value to determine whether it…
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answer549
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viewsA: How to not return a None value in Python?
You need to learn how to use the else which is the counterparty of if, that is, whenever the if fake der he falls into the block of else, if there is one, in your case there is no error, the error…
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answer129
viewsA: When is the destroyer of an object called in C++?
Under normal conditions the destructor is called between the return seen in the code and the last statement that computed something (including one that is in the return). The compiler inserts…
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answer98
viewsA: Doubt when designing a database
In essence the performance makes no difference, there will be some, but it will not be significant. And it depends on the load. The first may have a minimal performance problem because the index…
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answers441
viewsA: Error 1 No Overload for method 'Inherited method' takes 1 Arguments
First of all I suggest looking for a book, a course, because you’re making a very complex code without understanding what’s going on in it, it doesn’t work, you’re mistaken and you’re making…
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answer223
viewsA: Database Structure - Php and Mysql - Marketplace
What you’re asking is if you should choose multi-tenancy or not. That’s what you should look for. And I already answered about him. We have no way of responding to your best-case scenario. There are…
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answer183
viewsA: Why is there no "Logical XOR" in C++?
There is yes, look at it, gives the result you want, it just doesn’t call Logical XOR because it already has a simpler name, it is called different, because that’s what he is, he gives true when the…
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answer105
viewsA: Update with SET giving error
The error message is clear about what is happening: the data is too long for the column Email. You are trying to save 29 characters, surely this column is configured in the table with a smaller size…
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answers140
viewsA: How to verify if a type is numerical in C++?
If you are using an older version of C+= you have to resort to some tricks to get the expected result. In the OR there’s an answer with one of them. Has other sources that indicate tricks. Or you…
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answers155
viewsA: Doubt about char in C
char * is a kind of data, we can read it as pointer to char, then means that the variable directionX will have the value of a pointer, ie a memory address that will serve as a pointer to some data,…
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answer75
viewsA: Questions about Javascript looping
There’s no pattern and I never noticed this variation of i for x because of this, some people like i (I), some people like x (I think it’s for something else), and of course there are those who must…
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answers396
viewsA: Get next record on a grouped foreach
You can’t use the for each when you want to control the index, so there is the for: var valor = 0M; @foreach (var i = 0; i < model.Count(); i++) { <tr> <td>Id</td>…
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answers77
viewsA: Find an index of a value in a matrix
To the array has it: Array.IndexOf(array, "Elefante") For list is: list.IndexOf("Elefante") Example: using System; using static System.Console; using System.Collections.Generic; public class Program…
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answer533
viewsA: What is the difference between Task and async Task?
When you use a async is allowing the method to be executed asynchronously with another method. Asynchronous methods always return nothing or return a task that will result in the future, so we use…
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answer438
viewsA: How to select N records in a select in Oracle plsql?
This? select id from tabela a, tabela b where id=id fetch first 5 rows only I put in the Github for future reference.…
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answer107
viewsA: What does @ do in variable names?
In this context is equal to VB using [] (if I am not mistaken he allows more things), he is used in front of identifiers (usually variable names) when the name is equal to that of a keyword, which…
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answers2757
viewsA: How to catch last word of a string in PHP?
The simplest and somewhat naive way would be this (I do not guarantee that meets any situation, but question does not say much: $palavras = explode(' ', 'José da Silva'); echo…
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viewsA: What is the difference between expressions : "int a" and "const int& a" as C++ function arguments?
The first is being passed by value, that is, the value of the argument being used in the call of this function is copied to the function parameter soma_a(). The second argument value is not copied,…
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answer1117
viewsA: Projects with synchronous and asynchronous Apis
In principle no problem. Of course, the moment they intertwine the synchronous will always prevail and the synchronous stop will cause waiting at that point, but if you are inside something being…
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answers702
viewsA: Function that takes another function as a parameter in C#
Your syntax is wrong, but okay. In C# would be: using System; using static System.Console; public class Program { public static void Main() => Exemplo(() => WriteLine("alguma coisa")); public…
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answers209
viewsA: Polymorphically manipulating subsclasses
In general, the superclass should know nothing about the subclasses. And in fact, this code does not occur. The foreach is sweeping a array with objects that abstractly possess a lot of Animal. Each…
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answer57
viewsA: Save ticket values by adding to existing amount
You need to make an accumulation and are discarding the previous value in each assignment in the variables. To accumulate you have to take the current value of the variable and add with the new…
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viewsA: Variables are automatically executed when declared?
Variables are states and not actions, so it makes no sense to talk about variable execution. What you did was call the setInterval(), this is enough. As argument passed an action, as he expects.…
javascriptanswered Maniero 444,682 -
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answers12436
viewsA: What are recorders and what is their basic functioning?
TL; DR What in fact are Recorders? They are memory positions within the processor with specific names, it is as if they were variables. How is the basic functioning of a Registrar? They are…
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viewsA: Text looks full of junk after typed
The code has some problems. I’ll solve some, but it’s still not robust code because it doesn’t test other problems, I won’t go into those issues. One problem is that to read text with white space…
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answer127
viewsA: Command "switch" enters falls into "default"
The main problem is that it is not converting data entry which is always a string to a number which is what is comparing. Eventually I could do that with the array instead of doing a huge switch.…
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answer3574
viewsA: Calculate percentage
The percentage symbol doesn’t calculate the percentage, you have to use the basic math to do that. Besides, I suggest learning to program in a more structured way. Learning in trial and error…
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answer861
viewsA: Passing array as a function parameter
If you are using C++ use the language resources and adopt the vector which is an abstraction, essentially without cost, correct in this language, it has numerous advantages. Do not program in C when…
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answers1447
viewsA: Why do I need WAMP (example) for Mysql to work?
When I started studying programming with database access, I had to install software like Mysql and WAMP. What you’re talking about doesn’t make much sense. WAMP is Windows Apache Mysql and PHP, so…
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answer464
viewsA: How to Replace Bar and Space by Dot and Comma in C#
Surely someone will come with a Regex solution, which in theory is better than what you are doing (generates several needless memory allocations and presses the GC), but for me to do in hand is…
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answer296
viewsA: How do I use the "Math.Max" method in C# without creating a lot of variables?
In fact, this is very confusing. first must declare the variable that will control the maximum height before entering the loop, it must be initialized with a value below the allowed. Inside you will…
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answer43
viewsA: How I define a unit of measure in the value of the variable
It does not, it is the problem of the application to deal with this kind of thing, you establish which unit is manipulating, the code understands units of some, what this thing only the programmer…
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answers5464
viewsA: Segmentation failure: Recorded core image
The main reason is that it is creating a vector with a random amount of positions, is whatever is in the memory at that moment, and this will burst the memory most of the time, but not at all. What…
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answers8001
viewsA: Subtract dates in PHP
No way to convert a date into int and get something meaningful. You have to make a difference using the date type itself to get a significant result, which will be a date range. Then you can get the…
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viewsA: What’s the difference between the remote Github repository and the remote one on my dedicated server?
Generally speaking, you don’t get these features. Don’t confuse Git with Github. On your server you only have Git, you don’t have anything that Github has. Nothing prevents you from adding…