Posts by Maniero • 444,682 points
6,921 posts
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viewsA: Validating null and/or empty fields when creating Java objects
I am even in doubt if the doubt is that same, because it seemed to me simple too (if that is it I complete the answer, otherwise I erase): class Main { public static void main(String[] args) { User…
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answer516
viewsA: What does & Python mean? What is your name? is an operator?
This does not exist in Pyhton, this is practically a typo, if you put this to compile will give error. This is pure HTML (before display), is how HTML represents characters < not to be confused…
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answers99
viewsA: Why doesn’t my variable change the value?
Because you’re starting him at 0, so he’s the smallest, he’ll only have a smaller one if he type negative, so he has to start with a bigger one, as long as possible (there’s another option but for…
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answers123
viewsA: Condition "if" does not enter
I think this is what you want: if (permissoes[0] == "0" && permissoes[5] == "0" && permissoes[10] == "0" && permissoes[15] == "0" && permissoes[20] == "0" &&…
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answers905
viewsQ: Should I treat emails as case sensitive or insensitive?
It is common to have a register, mainly of login requesting an e-mail address. According to the RFC governing e-mails and domains the first is case sensitive, while the second is insensitive, which…
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answer226
viewsA: What is the code you made for Lua’s print() and io.read() function?
When you want to see how a function works in Lua go to the Github of hers and see. For example print() and io.read(). You have to follow what it calls to try to understand what it does, but these…
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answers264
viewsA: SQL syntax error when updating a record in C#
Your code has some problems, even if it works, it’s wrong. I won’t talk about them all in detail. The wrong use exceptions, I only advise researching the subject right here on the site to start…
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answers82
viewsA: I’m not displaying the multiple correctly
The statement is not so clear, so I wouldn’t worry too much if this is right, just focus on the result, which would even give to cheat since you can’t even know exactly what the challenge calls for…
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answer177
viewsA: Repeat an algorithm if the answer is wrong in guessing game without losing the drawn number
Calling the same function is not very suitable, may even burst the stack, although in this case it is highly unlikely that this should occur, but get used to doing it right. It is best to make a…
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answer108
viewsA: How to convert Enum to int by filling with zero on the left?
First you need to take the amount with a cast for example, and then turn into string, the pattern of ToString() of enum is to give the description of his name. using static System.Console; public…
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answers345
viewsA: How does the rounding of the string format work?
The simple answer is that they are different, there is no commitment to being equal because they serve different purposes, so it is always good to use what you really want. There’s no dichotomy…
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answer850
viewsA: Calculate average with final exam if I fail standard grades
Right away it’s not right because the exercise calls for 4 notes and you only ask for 3 and divide by 2 I don’t know why (I don’t know what better to expect doing this wrong, if it saves typing some…
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answers184
viewsA: Differences in the method call
In this particular case the difference is that the Replace() is a normal method and the ClasseA() is a constructor that returns an object that he just built, but can call it in string, so the…
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answer63
viewsA: Struct member print print something strange
The whole problem happens because the code has something conceptual wrong, so I tidied up the whole code, with organized code is always easier to work. It started with the code worth 1, and it…
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answer816
viewsA: How to make an excellent C++ program without C traces?
It is not easy to make an extensive list, I will try to put what is most important without worrying about small details (example: not having to use void to ensure that a function has no parameters).…
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answer458
viewsA: What is the difference between innerHTML and appendchild in JS?
appendChild(), a method, adds a new element to the DOM, so it is an action being executed with the clear intention of expanding the DOM by creating a child to an existing element, no matter what it…
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answers234
viewsA: Variable declaration assignment in C
It is necessary to assign a value to a variable in C once we declare it? No, that made less sense in older compilers than it does now. The first C compilers required declaring the variable at the…
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answers79
viewsA: Use user, email or one of the two for authentication?
When talking about user experience you always have to consider who this user is. According to each type can be a different response. In general it is said that it is not possible to answer this…
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answer84
viewsA: Entry problem in loop comparing string
The main reason is that you are trying to compare strings with the == when it is right to use the function strcmp(). And there’s another problem that’s not exactly comparing two strings, one of the…
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answer95
viewsA: Operator ">" cannot be used comparing strings
In Java String is not a type of first class, so it has no operators, and you should compare with the method compareTo(): import java.util.Scanner; class OrdenarNomes { public static void…
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answer153
viewsA: How to pass the return of a function that is a tuple as arguments to another one in Python?
I think that’s what you want: def chamar_ab(): a = 1 b = 2 return a, b def soma(x, y): return x + y print(soma(*chamar_ab())) It’s the same with lists and dictionary keys, but using values looks…
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answers1560
viewsA: What is the difference between window.Location and window.location.href?
window.location is an object that contains all information about the current location of the document (host, href, port, Protocol, etc.), ie is a complete object and can use to operate in various…
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answer175
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answer369
viewsA: Why . dat and not . txt?
.dat it’s just any name, it indicates nothing about what it has inside, there’s even no specification that says that a .dat should be one way or another, just as a `.txt also does not, although it…
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answers626
viewsA: Ways to initialize struct’s
The fact that something works doesn’t mean that I should always use, some cases work by coincidence, in a specific situation, I would do it in the most semantic way ever. Basically I can remember a…
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answers1851
viewsA: What is the problem of using [n]varchar(max)?
And you didn’t ask him why? Should, if he said he has to substantiate. Unless he didn’t know, that he read it somewhere and went off repeating it like a parrot. Anything without foundation should be…
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answer2713
viewsA: The index was out of range. It should be non-negative and smaller than the collection size
This code has at least two problems, one that is not so apparent that is increasing the variable i (in i++), And it doesn’t look like you want this because you’d skip one. But it’s really weird,…
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answers202
viewsA: What is the purpose of serialization?
What is serialization, if I wanted to ask would be duplicate: What is serialization? When to use? How to implement in C#?. Answering what you asked: Serialization is used to work the object in a…
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answers1147
viewsA: Should I declare a variable within the "if" or separate condition?
There are controversies as to the subject of the question. Some people find it less readable. Some have established a rule that everything that generates side effect (change of state) should be on a…
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answers154
viewsA: Why is the average score always "Nan"?
The code is very confusing. First you need to declare the variables that accumulate and count for the loop, and it would be good to initialize with 0 to make more explicit that this is the…
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answers1436
viewsA: Take variable value in another method
You want to make a simple return, but in this case you don’t even need a variable: public IActionResult OnGet() { var variavelAqui = CarregarMenu(); Return Page(); } public static void…
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answers77
viewsA: Doubt about switch
I don’t know why you created these variables, especially doing the operations before having the values typed. A program executes in an order. And contrary to what you must have learned, you declare…
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viewsA: How to make my function Len() return the size of Std::string, vector and const char *?
Is not if what you should do, is specialization (a much more advanced concept that doesn’t seem to be the case to learn now). So: #include <iostream> #include <string> #include…
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answer102
viewsA: Use of "global" with mysqli leaves the connection open?
The question makes no sense, it presupposes that it is opening two connections when clearly the code shows that only one is being opened. The second code is using the already opened connection, it…
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answer170
viewsA: C matrix showing large numbers and not typed
The biggest problem is that it is manipulating a matrix as a vector, it simply abandoned the columns, if it is a matrix at all times it has to have two indexes, one of row and the other of column,…
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answer265
viewsA: Compute square root with input from typed text
You first need to convert and then apply the operation to the number. But in the way you’re doing it you can still break the application if something goes wrong: private void buttonRaiz_Click(object…
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answer87
viewsA: Adding rows and columns in DOM table
Shall we do it the proper way? Writing in the DOM is gambiarra, we will manipulate it as it should be (anyway had logic errors in the original code). function table() { let max = 100; let table =…
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answer64
viewsA: "short s = 2;" Does Java already understand 2 as short?
There is no conversion, but there is one cast implicit, so even though technically its literal is a int, if it can be considered a short this will be done by the compiler when generating the code.…
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answer243
viewsA: Help with ROT-13 C encryption
Let’s make it simple. What you should do is you should add up to half of the alphabet 13, if you pass that part you should subtract 13. Isn’t it simpler? I took advantage and improved performance by…
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answers283
viewsA: Use of empty "print()" in place of " n" before conditions
No problem at all. You’re actually thinking like a programmer and avoiding unnecessary repetitions. Maybe you don’t see that much because some people don’t think like programmers and others just…
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answer922
viewsA: Why is it not possible to use an "alias" in the WHERE clause in Mysql?
The alias is created during the execution of the SELECT. Contrary to what may seem intuitive, after all this clause of the command always comes first of all, the WHERE is executed always before, so…
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answers642
viewsA: What is SQL dialect 1 and dialect 3?
It’s not about SQL itself, it’s about Firebird. At some point the product concluded that something he was doing was wrong and decided to do it differently, but very little has changed. But a lot of…
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answer403
viewsA: Pass data from one array to another
You don’t have to make another loop to control that, loops are used to keep repeats (people don’t understand their use, for some reason they think it has to do with variables), you just need to have…
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answers485
viewsA: Parent class array with two different subclasses
There’s a lot of conceptual errors there, and that’s why it causes the problem. Almost everyone makes the conceptual mistake they’ve made, some even insist it’s right, and if you’re going to present…
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answer61
viewsA: Why do I need to add a parenthesis under multiple conditions of a ternary operator?
Question of precedence and association of operators, the language finds a situation that an operand may belong to an operator or another, it has to make a decision to which operator that operand…
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answer89
viewsA: Am I required to use a repeat loop if my LINQ query returns only one object?
No. If you want to continue doing so and so still received a IEnumerable, has to access an element, can not access the direct object because it is a data collection object and wants the individual…
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answer50
viewsA: Access DLL’s using Javascript in Google Chrome browser
Luckily there isn’t, this has always been a huge security problem. There was one thing called Nacl, but luckily it was discontinued. There are other gambiarras who invented, but it is to look for…
javascriptanswered Maniero 444,682 -
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answers120
viewsA: Bingo program does not identify who has won
There are several mistakes there, I’ll leave the little ones, we go to the main one that occurs more than once: To draw numbers without repetition correctly and efficiently you must use the…