Posts by Wtrmute • 2,359 points
84 posts
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1
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answer1043
viewsA: Segmentation failure (recorded nucleus image)
You are forgetting to initialize a lot of local variables as well as check the sizes of the entries you are receiving, and this can generate segmentation failure depending on what input you write to…
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answers1013
viewsA: What is blockchain and how does it work?
Blockchain, As the English name says, it’s a chain of blocks. It serves as a distributed database whose validity can be verified by anyone so that the security and transparency of the system are…
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answer382
viewsA: Open, read and write csv
The function int feof(FILE *), stated in stdio.h, returns 0 if the file still has bytes to read, and 1 if you have found the end of the file. With this, you can execute a loop and transcribe the…
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answers560
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answers406
viewsA: Disable input sequence with jQuery
Taking advantage of the @Leandrosilva’s cue above, you can simplify the code by keeping the name of the class of fields you have to disable in the checkbox: $(document).ready(function() {…
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answer251
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answer1721
viewsA: How to find private bitcoin address key?
You do not. An asymmetric key algorithm is specially developed for that private key nay can be found from the public key. If you could guess the private key of a wallet, it would be the same as you…
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answers574
viewsA: How to consume JSON files in PHP in different ways?
JSON is a notation-based form of object serialization used to describe object literals in javascript. Therefore, the notation should be flexible enough to reproduce any* type of object that can be…
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answers488
viewsA: How to treat this Nullreferenceexception
Ok, the Nullreferenceexception is raised in the following line: pessoaJuridica.InscricaoEstadual = viewmodel.PessoaJuridica.InscricaoEstadual; This means that the indirect operator . is being called…
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answers1323
viewsA: Why do pointers have a fixed size independent of the pointed type?
Because a pointer keeps in itself a memory address, and these all have the same size regardless of the type of data with which to interpret the object at that address. On a 32-bit platform, memory…
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answer138
viewsA: Jquery returns "0" in div
You seem to be wearing this jQuery Form Plugin. If that’s the case, I’m surprised that you use option-based both the property target, that "... identifies the element to be updated with the server…
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answers1252
viewsA: What are ASAX extensions for?
The archive Global.asax is a file that contains the application level events (hence the extension, Asp.net Application). Its syntax is not particularly different from an ASPX file, except that it…
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answer26
viewsA: How do I calculate to convert a Codepoint to UTF-16?
The 16-bit (UTF-16) Unicode transformation format is defined in section 2.5 of the Unicode standard, as well as in the RFC 2781. It works like this: Be the Codepoint U the value you want to encode.…
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answer884
viewsA: How to fill out form from the combobox, with database information?
When the user selects an element from the combobox, it is an activity that occurs on the client side (i.e., from the browser), and the code that runs on the server, PHP, does not and cannot be aware…
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answers91
viewsA: How to make the code not catch the ASCII Code from a variable?
ASCII has a feature that the digits are in order, starting with the '0' and ending in the '9'. Thus, the ASCII value of the '0' is 0x30, the '1' is 0x31, etc., up to the '9' being 0x39. Therefore,…
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answer41
viewsA: Doubt regarding the passage of parameters
No, the code is wrong. Probably the inductive step should be return foo1t(n-1, n*resp); Functions in C can be declared "no parameters", and can have a variable amount of parameters (functions…
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answers512
viewsA: Error creating child - Process scheduling using Fork
The logic you are using is wrong; to facilitate, we will break the code into multiple functions using the informal description you made: #include <iostream> #include <unistd.h> void…
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answer54
viewsA: How to maintain the rotation of images, even with mouse Hover?
The page uses a component called "Revolution Responsive jQuery Slider". According to the documentation, there is a boot parameter called onHoverStop responsible for stopping the timer (which changes…
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answer187
viewsA: How to draw 2 images on canvas with different fps
window.requestAnimationFrame() actually only invokes the function passed per parameter every 16.67 milliseconds (that is, 60 times per second). The responsibility of the function passed as parameter…
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answers7433
viewsA: Reverse vector position/value
There’s absolutely no reason for you to use two for to scan a one-dimensional vector... #include <stdio.h> #include <stdlib.h> #define TAM_VET 5 int main(void) { int cc[TAM_VET],…
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answer81
viewsA: What’s going on here on this C show?
Whenever you create a local variable to a function, it is allocated to a memory area called "the stack". It contains the local variables and some more information that allows the computer to know,…
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answers138
viewsA: Is it possible to use for loop to reduce C code?
Although ordinarily I follow Lacobus' response, this is a good place to remember that the compiler tcc has a dynamic link library that allows dynamic code compilation: #include "libtcc.h" void…
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answers1602
viewsA: What is Inter Process Communication (IPC)?
Multiprocessor operating systems are operating systems that are capable of executing more than one process at a time. Examples are UNIX systems, Windows version 95 onwards, and macos Classic (Macos…
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answer1074
viewsA: How to replace a middle character of a string and swap for two characters?
There is no escape: you will have to allocate another place to store your result. By doing this you can then replace your string and have enough space to store it all: char * substituir(char *…
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answer361
viewsA: Import multiple libs into a single include in c
It doesn’t exist; Preprocessor C is a very primitive macro language, and little integrated with the rest of the language (like Dennis Ritchie himself states). What you can do is create a separate…
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answer391
viewsA: Site view internet speed
The account is simple, and any language serves to implement it on the server (on the browser side, it obviously has to be on javascript). Essentially you have to have one or several files of known…
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answers4985
viewsA: How to read string with space in a repeat structure?
Your problem when it comes to using the scansets (the name of those structures "%[^\n]") is that, as you imagine, in time for him to pick up the first item he reads until the first car return, but…
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answer1079
viewsA: Compare integer and pointer
getc() returns a int, not a char *. In this int is the ASCII value of the next character in the file. And, really, when you say while (ch != EOF), you are comparing the value of that character with…
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answers8342
viewsA: SELECT in a table using NOT EXISTS SQL (SERVER 2012)
Yeah, you’re trying to select lines in tb1 that don’t exist in tb2, but that’s not what you wrote. What you wrote was to select lines from tb1 when there is no line in tb2 (NOT EXISTS (SELECT * FROM…
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answers224
viewsA: Code Optimization / Image Processing
Okay, given the code snippet shown and the characteristics of the algorithm I was able to apprehend, there are some observations that you can make: First, if you want to avoid the ifs nested, you…
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answers281
viewsA: Problem with pointer and recursive function
The problem is that you do the search(&(*root)->esq, mats); and the search(&(*root)->dir, mats); and then throw away the recursion return value, so unless you happen to look for the…
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answers899
viewsA: Angularjs Date Subtraction
Angularjs stores the values of data type controls using the date object Javascript. To subtract two dates, you can use the method .getTime() which returns the number of milliseconds passed between…
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answers199
viewsA: code implementation
The most important thing when creating a program in parts, each part by a different person, as you are doing, is to establish between you what will be the interface between the code of the two: that…
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answers3223
viewsA: How to use the "fread" function in c to read a txt file string and store that string in an array?
You are copying 5 bytes of your file to a buffer (vetor) and then calling strlen() in it, which is a function that counts at which position of the vector it receives is the first byte '\0'. But you…
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answers977
viewsA: How to know the size of an object in memory?
If your object is Serializable, you can use a java.io.ObjectOutputStream associated with a java.io.ByteArrayOutputStream to measure the size of your object when serialized: class Tamanho { public…
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answer374
viewsA: How to take the least significant bit of a character and hide in an image file?
You’re caught up in the concept of steganography. Let me try to explain a little here, and with that you should understand enough to start an implementation: First, an image can be understood as a…
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answers235
viewsA: How to check by javascript if you have entered a new li tag through setInterval?
There’s a little library called insertionQuery that detects the creation of nodes using a macumba of CSS animation, so it does not generate weight. The interface is not jQuery, although it is…
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answer2314
viewsA: Create a recursive function in C that returns the largest and smallest value of a vector
I don’t know from which version of the C pattern one can allocate an array on the stack, as you did, using a variable as size index; or it’s C99 or C11. But if you want more C89-compatible code…
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answers199
viewsA: How to make a look-Behind using quantifiers such as the " d+"?
Instead of using lookbehind, you are best served using a capture group to get a reference to the sequence test: /^\d+(test)/ Then you access group 1 to get the string test. All right it’s kind of…
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answer45
viewsA: Seg Fault Core Dumped
I think you got caught up: there on line 15, you say: if (lA != cB) { printf("\nImpossivel fazer a operação!!!"); return 0; } But to multiply matrices, the amount of columns of the first matrix has…
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answer53928
viewsA: How to resolve Object Reference Not Set To An Instance Of An Object
This exception occurs when you call a method (or, more generally, reference) to an object null. In the case of the line where the error occurs, one of the objects (tabela, dataGridView1,…
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answer12103
viewsA: How to make a transposed matrix of user-chosen dimensions in c?
The problem is that you are transposing the matrix in-place, Then the order of operations makes a difference. When you transpose the first half of the matrix, you no longer have the first half of…
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answer147
viewsA: How to divide 2 numbers represented by a circular list into C?
I don’t understand why a list should be circulated, but come on. As you passed pseudocode in the question, I will answer with pseudocode too; if later have difficulty in converting pseudocode into…
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answer115
viewsA: Function count left tree
int qtd_niveis_esq(tipo_arvore * raiz) { return 1 + qtd_niveis(raiz->esq); } The problem is you just want to ignore the right son from the root node. From the left child of the root, you want to…
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answer116
viewsA: How to use Lock Functions (Lock Routines) from Openmp?
The difference between the two specified functions, omp_init_lock_with_hint() and omp_init_nest_lock_with_hint() is that it initializes a lock simple and this initializes a lock nestled. The…
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answers11315
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answer393
viewsA: Double Chained List Removal Doubt (C/ Ordered Insertion)
When we analyze what happens if we pass a list with a single node, the problem becomes obvious: Just a reminder: when the list has only one node, **inicio == **fim and (*inicio)->prox ==…
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answers520
viewsA: Give a select to return the exclusive values
Alternatively, by using clauses WITH (some find it easier to reason like this): with diferentes as ( select chave from teste where status = 'DIFERENTE' ), diferenciados as ( select chave from teste…
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answer129
viewsA: How to reuse a function correctly in C?
If the divisibility functions need return true and false, so you really can’t return any information that allows you to verify the number by 9. But there’s a trick: int divisibilidade9(int num) { //…
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answers2122
viewsA: Lock letters and special characters
The truth is, although practice has shown that the function printf() is quite useful for multiple purposes, unfortunately the function scanf() it’s not that useful. Particularly, it doesn’t handle…