Most voted "allocation" questions
Allocation refers to interpreted languages such as C and C++, which dynamic memory allocation is part of data management and security.
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answers910
viewsError in fgets function
The program gives Segmentation fault (core dump) when executing the fgets function. Any idea? #include <stdio.h> #include <stdlib.h> #include <string.h> main (int argc, char…
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answer196
viewsHow to iterate for each character in a Std::istream?
In a std::string, the allocation is done so; in Chunks 128-character note. It takes every character from input and puts it by std::string::push_back. How can I do it? Note -…
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answer451
viewsObject and pointer allocation
How do you allocate a pointer, which points to a class, and an object? Is there a difference? Size, etc
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answer388
viewsDynamic Memory Allocation in Cobol
How to allocate dynamic memory in Cobol without using external C libraries? I have no interest in using some kind of *alloc() from C. In any flavor of Cobol exists? It must exist, because if some…
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answer153
viewsRemoval item in chained list C
Guys I’m having a very annoying little problem, I’m implementing a simple A* . When I move the already checked item to the closed list and move the item from the open list, it is giving undeclared…
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answer2933
viewsHow to find the number of rows and columns of a dynamically created matrix?
Based on my knowledge, I created a function that returns an initialized matrix: int** initMatriz(int rows, int cols){ int i,j; int** matriz; //aloca memoria para todas as linhas matriz = (int**)…
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answers2074
viewsDynamic matrix allocation in C++
I would like to dynamically allocate this matrix in C++: int main() { int n,m; cin>>n>>m; if(n>m){cedula tabela[n][n];} else {cedula tabela[m][m];} return 0;} but the code does not…
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answer161
viewsProblem with malloc in C when creating string concatenation function
char *ft_concat_params(int argc, char **argv) { int index; int aux2; char **newString = argv; aux2 = 0; while (argv[aux2] != '\0') { index = ft_strlen(argv[aux2]); newString[aux2] = (char *) malloc…
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answer193
viewsProblem with dynamic allocation
I need to make a code where the user fills in an array as many times as he wants, but the code stops running. If I register only 3 values, like (1) (2) (3) it works normally, but in some moments…
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answers120
viewsHow to format strings and store them in a dynamic vector
In several parts of my code I need to use bash commands to run programs on Ubuntu. To do this, format the command using sprintf and then run with the system function. Ex: sprintf(sprintfoutput,…
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answer188
viewsnome.exe has stopped working. I can’t fix this
My C code gives a crash displaying following po error: filename.exe has stopped working I don’t know how to fix it. Follow the code I’ve already made: #include <stdio.h> #include…
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answer245
viewsWhat is the purpose of using pointers and allocation in c/c++
I would like to understand what pointers are in a generic way and their use, I see simpler codes as registration that I myself do in codeblocks run smoothly without them. Similarly I’m doubtful…
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answers750
viewsSpace occupied between different types of integers
By the table of official Mysql documentation, and a question here at Sopt, I had a question. Considering the table: Type Storage(Bytes) MinimumValueSigned MinimumValueUnsigned MaximumValueSigned…
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answer131
viewsC pointers
Well, guys, I’m doing graph theory on C, and I tried to use dynamic allocation to create an array. Also, my code has a function to fill the matrix with 1 in the received indexes. But I have some…
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answer238
viewsHow to pass a dynamically allocated struct to a C function?
The program must dynamically allocate the struct and pass it as parameter. #include <stdio.h> #include <stdlib.h> typedef struct cadastro_de_mercadoria{ int codigo; int estoque; }…
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answers105
viewsTrying to understand c/c++ pointers
Hi guys I’m new to the stack and it’s like this: I’m studying pointers and I made the following code: typedef struct { char nom[256]; int size; float value; }tdados; // criando o tipo tdados com…
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answer50
viewsValgrind problem and dynamic allocation in C++
I have a program a little bigger than that, I selected the part that I can not solve, are errors that seem unfounded, I’ve really tried everything. I imagine it’s a structural problem. I will post…
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answer356
viewsDynamic string allocation in an array
I have a problem to store a vector dynamically need to save 10 names but I’m not knowing how to access this data for later printing follows my attempt #include <stdio.h> #include…
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answers580
viewsStruct with pointer and allocation
I can’t use the fscanf in a structure, I have already allotted the structures. #include <stdlib.h> #include <stdio.h> #include <string.h> struct Cliente { int numero; char *nome;…
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answers420
viewsHow to remove a variable from memory?
How to remove a variable, not necessarily from the code, but from the memory/record, in C? Hypothetical example: char meu_byte; //codigo deleta_da_memoria(meu_byte); That generates something like:…
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answer5855
viewsPointer of struct inside a struct
I cannot assign value to a variable of a pointer struct within a struct. My structs: typedef struct notas{ float geral; float especifica; }Notas; typedef struct data{ int dia,mes,ano; }Data; typedef…
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answer657
viewsSize of struct allocation
When declaring a normal variable of type int for example, the compiler goes there and, depending on the architecture, separates 4 bytes. struct exemplo{ int x; int b; }; int main(){ struct exemplo…
c++ pointer struct memory-management allocationasked 9 years, 11 months ago Alexsander Borgesdamaceno 541 -
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answer41
viewsAccess memory allocated on a pointer
If I have a pointer vector of the type *p[tamanho], in which each position will be occupied by p[tamanho] = malloc(10*sizeof(int)), how to access each position of this vector allocated with the…
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answer254
viewsDynamic allocation and pointers in Lua
I would like to know how I make dynamic allocation and pointer of a structure in Lua, I have the following instruction in C that I need to pass to Lua; typedef struct ilha { char name; struct ilha…
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answer350
viewshow to write a name using pointers
I need a program that uses memory heap to store any name. input we have the number of characters of the name and then the name, for example: 32 Josefina Penacho Reis dos Santos The output must be…
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answer208
viewsProblems with dynamic allocation and struct
I intend to create a struct where there will be a vector of structs... The way I thought of doing it was kind of like this: typedef struct{ char *teste_str; int teste_int; }TESTE_A; typedef struct{…
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answer211
viewsHow to reference mat[x][y] in pointer notation
I’m working with programming in c, with pointers and dynamic allocation, need to respond to an exercise that asks for the following: How to reference mat[x][y] in pointer notation.…
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answer236
viewsTraverse an array using malloc
In the course of some questions here in the SO I saw this example and I was left with doubts. #include<stdio.h> #include<stdlib.h> #include<conio.h> void main() { clrscr(); int…
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answer272
viewsHow to start an array with the value the user type is possible?
If all allocated memory is defined at the time of compilation, then how is this possible: int num{0}; cin >> num; int array[num]; From what I understand, this could only be possible if using…
array c++ memory-management allocation variable-declarationasked 6 years, 9 months ago silash35 483 -
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answer1567
viewsstrcpy() in struct string
I have a struct Time that has a vector char name[30], the problem starts when I try to copy a value to that string with the function strcpy(), follows the code of stuct: typedef struct Time{ char…
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answer311
viewsdouble free or corruption (out) - Using C++ matrices
I’m writing a class that deals with C++ matrices. However when creating a method to calculate the determinant of a matrix I am bumping into the following error: double free or corruption (out)…
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answer505
viewsMemory allocation error for multiple files "terminate called after Throwing an instance of 'Std::bad_alloc' what(): Std::bad_alloc" [C++]
I’m using a sorting algorithm for a digital voice signal processing project. This algorithm was developed to receive all audio signals in a single vector to do the processing, but I’m having…
c++ allocation memory-management multiple-file-upload memory-limitasked 4 years, 8 months ago Marcus Vinicius De Paula 21 -
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answers28
viewsC structure to be dynamically allocated
I’m needing it to be dynamically allocated but I’m not finding the problem. #include <stdio.h> #include <stdlib.h> #define tam 10 typedef struct pilha{ char dado[tam]; int pos; }Pilha;…
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answer168
viewsFunction removes chained list
Save everyone, I’m learning chained list in python, as I already have some knowledge of list in C hit me doubt about node removal, the basis of the algorithms I used in some exercises is this:…
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answer80
viewsError reading values for a dynamically allocated matrix
Good afternoon, I’m doing some coding to study more about C memory allocation with the malloc function, and I was developing a code to allocate an array and then read values and save it, but it’s…
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answer62
viewsAssign string value with pre-defined size inside the pointer
You need help with dynamic memory, I can’t understand why I can’t access nome of ptr in the method adicionarSocio? How can I change this field? I have to do malloc of the name before assigning even…
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answer175
viewsDynamic allocation giving problem in c++
Have this problem to solve in Hacker Rank and my code for the solution of this problem was as follows: #include <cmath> #include <cstdio> #include <vector> #include…
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answers138
viewsAre variables declared within blocks or subprograms dynamically allocated?
I’m reading the book "Algorithms and Programming with Examples in Pascal and C" and in it there are two paragraphs that left me in doubt, are they: Two alternative forms are offered by some…
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answer924
viewsHow to print a list in C?
/* define a struct TAD lista */ struct lista { float info; /* dado */ struct lista *prox; /* ponteiro para o proximo elemento */ }; typedef struct lista Lista; I have the struct above and the…
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answer470
viewsDelete a struct record using free()
I’m creating a record using struct, where I must have a menu to include, show and attend (exclude) patients. The problem is in the exclusion function that because of my lack of knowledge I do not…
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answer471
viewsArray of pointers with struct
I’m trying to assign 3 names to a string vector within a struct, and using pointers to reference the dynamically allocated struct, and then print and then reverse it into a repeat structure, but…
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answers90
viewsExit error while trying to print contents of.txt file
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <getopt.h> typedef struct{ char **matriz; } Dado; void ler_agumento (Dado *dado, int argc, char **argv){…
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answer647
viewsDynamic allocation in C++
I was learning a little bit more about dynamic allocation in C++ on the Internet, and a teacher’s code caught my attention. It is a code made to spend only the necessary memory and not have "blank…
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answer70
viewsDoes the char vector have a minimum size?
I’m doing a huge job and he’s given a bug very strange when allocating vectors of char with specific sizes. After a lot of headache I decided to do a small test. #include <iostream> using…
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answer54
viewsAt the last run of the repeat loop the entered value is assigned to my counter
I put a printf() to track what happened and everything was normal, until I type my last value and it is assigned to the counter quantN. The conditional even works when it is a negative value, it…
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answers1848
viewsRecognize enter key in C
I’m trying to make a code that only prints the third to a typed string, but my program is endless, how to recognize the given enter for the program to end? #include <stdio.h> #include…
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answers342
viewsError exited, Segmentation fault in C
I’m trying to make a function that returns me a date according to an integer and always appears the error: exited, Segmentation fault The code I created is basically this: #ifndef DATA_H #define…
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answer33
viewsError reading a file and saving it in dynamically allocated space in c
I want to create a program that: Opens the file teste I figured out the size of this file Allocate enough memory space for file + 1 (\0) Read the file contents using the function fread and saved in…
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answers85
viewsAllocator and placement new
I have a problem with placement new along with a "homemade allocator". The problem is that for data types (int) it works well, now for double, they start to trim very strange outputs. The classes:…
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answer121
viewsHow do the istreams of a string work?
To catch a std::string, type pointers are required char, as far as I know. However, to grab a pointer, you have to allocate memory (necessarily, or there will be a runtime error, one Segmentation…