Most voted "c" questions
C is a general-purpose computer programming language used for operating systems, games, and other high-performance jobs and is clearly distinct from C++. It was developed in 1972 by Dennis Ritchie for use with the UNIX operating system.
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answer46
viewsParole bugging in C
When I run the program and type the option it doesn’t scan the value given by the user. I don’t know what might be bugging the choice variable this time. What could be? #include <stdio.h>…
casked 8 years, 9 months ago Gabriel Ribeiro 163 -
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answers90
viewsDoubt with C pointers
Hello, I am looking for the problem hrs in this excerpt (implementation of an avl tree) but I can not find, I pass a Dictionary D to this function and its value is modified within the context, but…
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answer325
viewsHow can I access a hard drive sector
I would like to know how I can make a code to manipulate a sector of hard drive and test on it as the Regeneration HDD does for example. And what libraries do I use in C ? (I do not know if in HD is…
casked 8 years, 3 months ago Matheus Chagas 1 -
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answers1296
viewsWhat applications for binary trees implemented in vectors?
I know the theory of binary trees, I have already implemented a stroke in C. I understand the functioning and applications of it when developed dynamically. However, a teacher asked me to develop a…
casked 8 years, 3 months ago Douglas Drosdoki 1 -
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answers45
viewsProblems with wxWidgets
I am doing a project using wxWidgets, and when the compilation appears the message: error: cannot specify -o with -c, -S or -E with Multiple files. I’m using codeblocks in Ubuntu and I don’t know…
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answer334
viewsProblems with binary search tree in C
Now reinstating my post more clearly (this is a continuation of my previous question). In the code, I try to create a binary search tree and insert elements into it. They must be saved in .txt.…
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answer286
viewshow to resolve "SIGSEGV" error when using`strcpy`
Hello, I am facing an error "SIGSEGV": strcpy(buffer_ReceiveAutomation, ls_buffer_PPouAUT); << ERROR and buffer is incomplete from recv, but if I change the sizeof(ls_buffer_PPouAUT) by the…
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answer397
viewserror: invalid use of Undefined type 'struct Fila'
I’m implementing a queue to control the threads created, in C. So as the thread is not the first in line she waits to be finished. example: // // Enquanto não é primeira da fila // while(idd !=…
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answer40
views`System.Nullreferenceexception` in C
Running the following code shows the error System.NullReferenceException in function call SubString #include <stdio.h> #include <stdlib.h> #include <string.h> // // Implementado o…
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answers96
viewsFile encoding error
Hello, I have a file encoding problem with my program that I made in C. It is writing in a format full of special characters which before was not writing this way. The Program is a Numerical Turing…
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answer1003
viewsHow to create a child process to an existing process in windows - C/C++
I need to call via Createprocess() or another function of windows a process and link to an existing process, it is possible to? thank you!
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answer371
viewsHow do I read a C sound file?
I want to make a mini sound player using double chained list, and I wanted to know which library and what functions it uses to read a sound file in c ?
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answers1387
viewsThis program is giving Runtime Error on Uri, I would like to know where I am missing
#include <stdio.h> #include <stdlib.h> #include <math.h> #include <string.h> int main(){ short int numCasos, i = 1, j = 1, soma = 0; long long int num; scanf("%hd",…
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answer758
viewsChange place characters - C
I need to write a C program that takes a word (string) as a parameter and generates a new string consisting of the original string with the following changes: The first character of the string must…
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answers99
viewsGeneration of allele numbers
I have declared a method for generating random numbers, but the results are almost always the same, because? int geraAleatorio(int min, int max) { return ((rand() % (max - min)) + min) + 1; } Is…
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answers66
viewsList removal
I have a program that registers trucks, cargo and cities through a list. I tried to remove the truck list, but when I removed it, the insertion still continues, as if I hadn’t removed anything. What…
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answer99
viewspreecher array, struct in C?
how do I fill in leds and seq without needing a loop for? int main() { struct ledvalue { int seq[10]; int leds[10]; }; struct ledvalue numbers; numbers.seq={0,1,2,3,4,5,6,7,8,9};…
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answer136
viewsHow not to show in the output the null positions of a vector?
How do I prevent those gigantic numbers referring to the empty positions of my vector from appearing? My code: int main(int argc, char** argv) { double notas[10]; double soma = 0, media = 0; int i,…
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answer87
viewsRead a specific phrase from a file and stop at it
I want to store in a string a part of an archive: Bruno Mossa Rezende 5 2 7 6 22 22 0.13 8 19 141 0.17 260 2 320 5.42 43 22 6 0.90 0 0 0 5 of that file I want to store in a string "Bruno Mossa…
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answer108
viewsTwo readers on the Australian
how this code in I read the card and inform if it is registered or not. Now I need to insert two rfid readers in the Arduino. How to add the second rfid reader to this code? include SPI.h include…
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answers53
viewsDoubt when using variables
#include <stdio.h> main() { float valor; printf("..."); scanf("%f", &valor); printf("%0.2f", valor); } In scanf I must refer to the pointer (memory space), already in printf this reference…
casked 8 years, 1 month ago Fábio Jânio 3,407 -
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answer65
viewsCreate dynamic structures from a text file?
I have data stored in a text file. I want to read the text file and store the data in my variables, then insert them in my function inserir_medico that will use the data to create a concatenated…
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answer56
viewsSIGSEGV error in using a pointer
I have the following problem: I am creating a pointer and allocating memory in it, passing its reference to function, but when I read it in the function happens the error reported in the title.…
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answers112
viewsWhat’s wrong with my Quicksort code in C?
Here is my code: #include <stdio.h> #include <stdlib.h> int lista[1000]; int tamanho; main () { printf("Tamanho: "); scanf("%d", & tamanho); int c; for (c = 0; c < tamanho; c++) {…
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answers55
viewsOffset vector hash error
I am trying to hash vectors with displacement for collision treatment. My program is giving an error. Someone can help me find the reason for the mistake? Follows the code: #include <stdio.h>…
casked 8 years, 7 months ago Israel Jesus Filho 1 -
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answer98
viewsrow on c doubt
having the code of the queue need to remove value and position both chosen by the user typedef struct reg { int conteudo; struct reg *prox; } celula; // Tira um elemento da fila fi e devolve // o…
casked 8 years, 7 months ago Matheus Matheus 11 -
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answer3668
viewsHow do I use fgets instead of gets?
before "talking" about my problem, first look at my code and ignore the accent errors in the console if you are going to run. #include <stdio.h> #include <stdlib.h> #include…
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answer241
viewsI can’t compare char[]
I am running a server that I did in C and is working normally, with only one exception: I cannot create a condition for the received bytes. The Write and Recv function work normally but I am falling…
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answers73
viewsStack does not remove values
Hello, I am making a Stack (LIFO) and it does not replace the values by 0 when removing the values from the stack. This was a way I found to "remove" the data from it and the display is shown with…
casked 8 years, 7 months ago Giovanni Cruz 81 -
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answer1075
viewsInsert Row C element
How do I "Insert an element (returning 1 if the insertion has been successful, and -1 otherwise) in a Queue" I did it, what’s missing: void enfilerar(tipo_fila *fila, int valor) { if…
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answer127
viewsErrors when compiling program using Mysql resources
I’m learning to use the Mysql, but I had some problems compiling a program, in C, using the resources of Mysql. Follows errors below: gcc: error: Usage:: No such file or directory gcc: error:…
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answer400
viewsFunction First element Stack
How do I make a function that returns the first element inserted of a pile? For example: i add whole values to my size 5 vector stack. 3 4 5 6 7 You have to return the first element inserted in the…
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answer856
viewsexercise Floating point error
I have a list of floating point errors and am having some difficulty with one of the questions. If anyone can help me, I am grateful. For the code below, I need to justify the reason for the error.…
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answer64
viewsAt the end of String’s printing always leaves the 0p. What is it?
I made a code to accept only a few characters read in one vector and pass to another vector. In this case, the first user can type whatever he wants and the program keeps only digits, mathematical…
casked 8 years, 7 months ago Miguel Goffredo 65 -
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answer260
viewsHow to read file . cap with C?
I’m making a small program in (C/C++) to read some data from a. CAP file (provided by TCPDUMP). A good example would be Wireshark, but need much less INFO. Turns out, this . CAP seems to be written…
casked 8 years, 7 months ago Roberval Sena 山本 492 -
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answer352
viewsCould you add a parameter in: system("color", var) in the C language?
I’m creating a simple program to change the color of the system. Only, I want to give the option for the user to write the color he wants. Ex: Has the table 1: Blue 2: Green F: Red C: Yellow F being…
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answer97
viewsConversation error from int to String
This code I’m using to study C, is not converting (at least it’s what I think) a INT temp10 to CHAR... appearing an error: line 5: 5182 Segmentation failure (recorded core image) What can it be? int…
casked 8 years, 7 months ago Roberval Sena 山本 492 -
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answers336
viewsProblem regarding type in function with variable parameters in C
I’m having trouble solving a problem in a function that receives variable parameters. I have a function that sums a variable amount of numbers, its first parameter is the amount of numbers to be…
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answers895
viewsError in using Else
The program is giving an error when compiling. Else without a Previous if Something about the else, there’s something wrong with the condition if and else? #include <stdio.h> #include…
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answer127
viewsNumber of elements allocated from a pointer
I need to know how many elements are allocated in my pointer pointer. For example with vector, sizeof(v)/sizeof(v[0]) this way I get the number of elements that this vector has. I would like to do…
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answers2034
viewsHow do I compare two strings in c
Basically what I want to do. It is receiving a String at the command line.Only the String entered, have to be in the binary base, so I do an if to check whether it is binary or not. My problem is in…
casked 8 years, 6 months ago Programador 135 -
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answer83
viewsFILE function in C
what needs to be done: develop an algorithm where calculates from file input values . txt or values entered by the user, a value in percentage that is outside the allowed, in case +-3 for all cases,…
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answer160
viewsQuestion about row in C
Can someone analyze my code and see what might be wrong?. It’s a simulation exercise I got to do in college. Error: Code runs, but loops. Which while has a problem? Code: #include <stdio.h>…
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answers477
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answer43
viewsError setsid function relative to ppid
****When running the source below relative to the creation of a Deamon with the setsid function, it was verified that after the ps -fu root command, ppid is not 1, that is the same as the init of…
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answer613
viewsOperations with linear queues, moving an element to the first row
I need an algorithm that handles a linear list of type FILA. (In PASCAL, it can either be done in pseudo-code, or C, or whatever is preferable). The algorithm must take an element from the queue,…
casked 8 years, 6 months ago João Regis 336 -
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answers53
viewspcap/pcap. h library usage examples for C programming
In the previous post, I wanted to know how to read correctly a HEXA character, (by chance it was from a .PCAP file)... Which has already been resolved! But now, the next step is already another: I…
casked 8 years, 6 months ago Roberval Sena 山本 492 -
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answer111
viewscrt*. or C files
What are the archives for crt1.o,crt0.o,crti.o e crtn.o in a program C. I know the extension .o has to do with object file, but what the cited files serve?
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answer42
viewsError printing message inside condition
When I type any value other than 2 equal values, the "Invalid typed value!" message is displayed anyway. Anyone knows why? #include <stdio.h> #include <conio.h> int main(){ int x, y;…
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answers75
viewsQuestions about the standard C library
I noticed that the header file (.h) are different in different compilers. So I have the doubt, is that this "C ANSI pattern" just defined which functions should have the standard library and not…