Posts by Maniero • 444,682 points
6,921 posts
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viewsA: How to test the condition on a vector?
There are some errors, including it does not even compile: #include <stdio.h> #define MAX 500 int main() { char text [MAX + 1]; printf("Informe o texto (tamanho maximo %d caracteres:", MAX);…
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answers10606
viewsA: Ways to instantiate an object and declare constructors
Carro carro = new Carro; Is not possible. Carro carro; Is declaring the type variable Carro but nothing is being assigned to this variable. It is stored in stack. Carro carro(); Is declaring a…
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answer300
viewsA: How to change the default system browser?
I’m just going to put out an alert. Are you going to trade a browser that thousands of extracompetent people have worked for years for something you’ve done? Make yourself at home. The secret is to…
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answer185
viewsA: How to capture and treat an Exception in the Swift language
To find out the possible exceptions you have to read the documentation of what you will use. Any other attempt will not solve. There are functions and methods that document your exceptions in the…
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answer50
viewsA: Isolatedstoragesetting in Windows Forms?
It is on file even. It has the possibility to use the Windows registry but I do not advise. What you can do to make it easier is to use something ready. I don’t like these ready-made solutions but I…
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answers208
viewsA: I need a code that gives the error Accessviolationexception
It’s simple: try { throw new AccessViolationException(); } catch (AccessViolationException ex){ Console.WriteLine(ex); } Behold working in the ideone. And in the .NET Fiddle. Also put on the Github…
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answer2388
viewsA: Access attributes of an object vector of another class using C++ pointers
I think that this question is far from being answered as you wish, and even if this answer does not answer what has been asked I will try to put you on the right path for later we see specific…
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answers1286
viewsA: while for number other than 0 in C
The code doesn’t even compile. The variable i does not vary. There are several situations where an error can occur there and there are things in the code that I would do very different, but I will…
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answer562
viewsA: Class implementation in the header itself
Methods are always declared in the class definition. And the class is normally defined in a file header. But this is not a must, nothing prevents the class from being defined in another file,…
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answer759
viewsA: Update by changing one value by the other in the table
This is the most basic use of UPDATE: UPDATE produtos SET cod_produto = "000002" WHERE cod_produto = "000001" I put in the Github for future reference.…
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answers2280
viewsA: String Manipulation - split()
Yeah, you get in a line: System.out.println("Dan Lucio Prada".split(" ")[2]); But it’s much better to use more than one line and do it right: String nome = "Dan Lucio Prada"; String[] partes =…
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answer79
viewsA: String usage gives error
First, you may be using a C++ compiler but you are programming in C. And you are using a function that should not be used anymore. Eliminate the getch() and the problem will be solved. There are…
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answer1358
viewsA: Send a message to TV on the network
Your problem is not exactly of programming but of understanding how the mechanism works. I’m not saying it’s impossible for you to communicate with TV given the current technologies, but it takes…
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answers197
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viewsA: How to model plots when you don’t know how many there are?
It is very simple, the error already begins in the idea that there are fixed installments. The customer does not have a debt with 12 installments, he has 12 debts. You can have a contract that…
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answer123
viewsA: Method Call with Matrix Parameters
In C arrays do not really exist. Deep down they are pointers. When to access an element matriz[i] you’re actually doing *(matriz + i). In a array multidimensional matriz[i][j] is making *(matriz + i…
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answer5408
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viewsA: How to convert a string variable to int?
You have to convert the string, which is the return of function input, for a number: n1 = input ("informe um número ") n2 = input ("informe um número ") soma = int(n1) + int(n2) print ("O resultado…
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answer173
viewsA: What is the difference between the two array structures and their repetition loops in Javascript?
Essentially it makes no practical difference. They create the same array and the performance will be the same for him. The performance may be a little better for the first case, but only in creation…
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answers100
viewsA: Will I lose my databases if I update SQL Server 2012 Express to Standard?
In theory there will be no problems, there is full compatibility. But if you are unsure, take a test first to be sure. In fact you can lose by wrong tricks. So it is good to do carefully, test…
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answers6996
viewsA: Program that sums/multiplies 2 numbers and what’s between them and prints
Just pull the operator out & us printf() end. They are having the address of the variables printed and not their content printed. If you want the content, use the name of the simple variable.…
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answers3477
viewsA: Principle of Delegation, what is it?
The term can be used in different ways in programming. In OOP it is basically a form of aggregation more specific. You leave certain aspects for another class - the delegate - to accomplish what…
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answers5507
viewsA: Why are NULL values not selected?
NULL is NULL, it does not compare (under normal conditions) with other things. Your selection is picking up all data nonzero that are different from N. To include nulls the query must say this…
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answers579
viewsA: Programming for the interface means programming for a super-type, why?
I won’t go into details about concrete classes, abstract, interfaces, because the AP has already asked several questions about this and has already received answers where there is a lot of material.…
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answers34111
viewsA: What is and what is an abstract class for?
All answers are right. I just want to add a simple information of what the abstract class is. It is a middle ground between the concrete class and the interface. It does not fail to have some…
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answer90
viewsA: How to register each new relationship between two entities
Not to be unanswered. Using a third key (such as id) in a relationship table, is correct? I can’t say, I don’t know what it’s for, what it refers to, and even asking I didn’t get an answer. But the…
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answer182
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viewsA: Update an item from a generic list to a specific item
I remade the code giving a more general solution, I believe you can take what you don’t need: using static System.Console; using System.Collections.Generic; using System.Linq; public class Program {…
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answer1967
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viewsA: Is the Apache server required in hosting services?
An HTTP server will always be required to fulfill requests from browsers or other clients that make use of communication by HTTP protocol. One such server is Apache, which is one of the components…
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answers2497
viewsA: What is the purpose of the "Spaceship Operator" <=> of PHP7?
In general languages use a function. The function you mentioned compares strings, already the operator <=> works with various types where this form of comparison is possible. Before PHP even…
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answers1278
viewsA: Difficulty with MSSQL and PHP on Centos 6 server
The MSSQL module is used to access SQL Server, which had no version for Linux (now you have, see gmsantos comment below). Even in Windows new versions of PHP do not have them available. You must be…
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answer150
viewsA: What is the "class" restriction on a generic type?
You can use any class and no more than this. You cannot use types other than a class, i.e., types other than a reference (although this definition is not quite true anymore because there is now type…
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answers107
viewsA: How to fix multiple errors in this code?
The question is inconsistent but I did what I could: #include <stdio.h> int main () { float nota1[6], nota2[6], nf = 0; int nm[6]; for (int i = 0; i < 6; i++) { printf("\nInforme o número…
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answer2064
viewsA: Solr, Lucene and Elasticsearch what are the differences? When to use one or the other?
You should know that both serve to search various content. Lucene Lucene is at a lower level. So it gives more flexibility and fine-tuning than you want to do. On the other hand you have to know how…
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answers263
viewsA: In a MVC structure, can we create a model that represents a View (SQL)?
You can put whatever you want a model. It represents data organized in such a way that it can be used by controller to produce views. It is common for the models to represent tables in a database.…
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answers1460
viewsA: Starting an Array of a private attribute in another class
Probably what you want would be this: public void setEmpregados(Funcionario[] empregados) { this.empregados = empregados; } But how will you always need to create one array of this type, you can…
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answers10490
viewsA: What is the difference between Association, Aggregation and Composition in OOP?
The definitions are conceptual. In practice the important thing is that we have generic associations between objects and the most commonly used term is composition, even when in fact it is not one,…
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answers433
viewsA: Keep data between sessions
In fact the static variable cannot be used. You need to create a session-based cache system or at least keep the information within the same session. public ActionResult MinhaAction() {…
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answers5878
viewsA: Convert String to Decimal
You may not have found the right method to do the conversion. It even works but it is not usually the right one. If something invalid is entered and the conversion will generate an exception. In…
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answers3092
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viewsA: In what order is the init() method invoked in the GO language?
This is a problem that no language I know has been able to solve on its own. There are no guarantees of the execution order. Simple as that. The compiler even tries to do this within an order that…
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answers1492
viewsA: While repeating structure to recalculate in C
The problem is that you are not restarting the variable value res when will you recalculate: #include <iostream> using namespace std; int main() { int vetor[10], i; char op; do { float res =…
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answer5474
viewsA: Programming facing the interface and not the implementation, why?
Because interfaces are only contracts of what the object has or is able to do. So you can use any object as long as the contract is guaranteed. Having only the contract you can get better:…
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answer1710
viewsA: Exchange messages between objects, what does it mean?
For use mainstream is what everyone knows as invocation or method call. That is, you call a method and indicate which object you are referring to. Smalltalk is that the language that originated the…
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answers11622
viewsA: Is it possible for a Javascript function to call a method that is in the Behind code of the page?
Directly is impossible but ASP.Net has facilities for the customer call invoking what they need: <asp:Button ID="botao" OnClick="botao_Click" runat="server" /> Then in the Code-Behind:…
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answers841
viewsA: What exceptions should I capture in a Try-catch?
Attention! This form is not ideal anymore. See documentation on. Always look at the documentation of all the methods used to see which possible exceptions and decide which ones you can deal with…
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answers1114
viewsA: Create string array in C#
There is no way to do that. The only viable solution is to change the information. By the example shown it is possible to use a string simple. If you have only one character, each will be an…