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.
Learn more…4,811 questions
Sort by count of
-
-1
votes1
answer45
viewssequence of letters and points in c
I need to make a program that compares several strings, I already tried to make one switch but it didn’t work because it only accepts a comparison character. I need each dot to represent a letter,…
casked 4 years, 1 month ago lenny45155 17 -
-1
votes1
answer52
viewsPicking up a file in a folder
I need to take a file with certain extension to open in fopen, but do not know the name of the file, just know that it is in the same folder as main, would have any way inside the main to know which…
-
-1
votes1
answer73
viewsError pointer -Wint-Conversion ?? Int to int *
#include<stdio.h> #include<stdlib.h> int *a; int b; int main() { b = 5; *a = &b; printf("%x \n",a); printf("%d",*a); printf("\n %d",b); return 0; } In code output this error appears…
-
-1
votes3
answers259
viewsProblem with recursive function, 2 parameters
I’m trying to write this code using recursiveness: #include <stdio.h> #include <stdlib.h> #include <locale.h> int potencia(int i, int j) { return (j > 0) ? 1 : (potencia(i , j)i…
-
-1
votes2
answers84
viewsDifficulty using variable between functions
My problem is this: I have a hard time understanding how I can declare a variable within a function and use it in int main(), the code below is an example of this, I tried several ways and was…
casked 7 years ago Gabriel Custodio 1 -
-1
votes1
answer30
viewswith I do to print multiples of N in a range in C language, my code does not run
#include <stdio.h> #include <stdlib.h> #include <conio.h> #include <string.h> #include <math.h> main() { int n, a, b; scanf("%d %d %d", &n, &a, &b);…
-
-1
votes1
answer59
viewsDynamic memory allocation gives error while accessing
I have a problem with my code: #include <stdlib.h> #include <stdio.h> #include <stdint.h> void a(void *po, size_t t) { void *r = realloc(po, t); } int main() { uint8_t *array =…
-
-1
votes1
answer54
viewsPointer cast
void *ft_memchr(const void *s, int c, size_t n) { while (n > 0) { if (*(unsigned char *) s == c) { return ((void *)s); } s++; n--; } return (NULL); } What would this be *(unsigned char *)s? I…
-
-1
votes1
answer35
viewsHow do I print an array in the form of rows and columns?
#include<stdio.h> #include<stdlib.h> int main(){ int m[3][2]; for(int i=0; i<3; i++){ for(int j=0; j<2; j++){ printf("Digite o elemento na linha e coluna [%d],[%d]: ", i, j);…
-
-1
votes3
answers67
viewsHow to make the user choose the amount of elements in an ARRAY?
#include <stdio.h> int main() { int numeros[10]; printf("Digite 10 numeros (separados por ENTER ou SPACE):\n"); for(int i = 0; i < 10; i++) scanf(" %d", &numeros[i]); printf("\nNa ordem…
casked 3 years, 10 months ago user239535 -
-1
votes1
answer41
viewsHow do I make a string larger than her fgets not move to the next fgets? (C)
Guys, I got these two string entries: printf("Entre com a string: "); fgets(str, sizeof(str), stdin); printf("\nEntre com o caracter a ser procurado: "); fgets(caracter, sizeof(caracter), stdin); It…
-
-1
votes1
answer59
viewsI wonder why my code doesn’t work, I believe my logic is correct, but it’s picking up garbage
I will receive 5 values in the vector, I have to add the largest of them to the smallest of them, What’s wrong with it? follows my code. #include <stdio.h> int main(){ int vetor[5]; int i = 0;…
-
-1
votes1
answer80
viewsHow to print words with special characters in c language
#include <stdio.h> #include <locale.h> #include <string.h> int main () { char palavra[10]; setlocale(LC_ALL,"Portuguese_Brazil"); printf("açúcar\n"); gets( palavra); printf("a…
-
-1
votes1
answer49
viewsHow do I associate a car with a driver in that code that I made
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <conio.h> #include <locale.h> typedef struct Motorista{ int driver_id; // id do motorista int idade;…
-
-1
votes1
answer40
viewsQuestion for in C (I’m still learning)
#include <stdio.h> int main (){ int i, n; printf("Digite um numero: "); scanf("%d", &n); int a; a = n; for ( ; a>=0; a--){ if(n%a==0){ i++; } } printf("%d", i); } This is my code, it’s…
-
-1
votes1
answer285
viewsArduino with counter
I can’t understand what’s wrong with that code S1 once and M1 stay turned on but it turns off after a while. The program also doesn’t count as it should. The question is this: In the system below…
-
-1
votes0
answers21
viewsProgram construction in C language
Build a program that reads the grade of 10 students in a class. Then build a function call sorts that receives this array sorts the notes from highest to lowest. After the call from function the…
-
-1
votes1
answer57
viewsReceive more than one value per line with C
I need to make a code where it is necessary to receive more than one value per line, however I do not know how many values The initial idea would be to use scanf("%d", valor); However, in that case…
-
-1
votes2
answers377
viewsError to print a C name on the screen using chained list
I made this code with the purpose of asking for notes and names and then printing on the screen, but for some reason the name n is being shown the name q was typed. The code was made in C. {…
-
-1
votes1
answer342
viewsHow to read a positive n number in ascending and hexadecimal order?
I’m in trouble on one issue and I can’t solve it. My problem relates to how to insert these values and organize them in the same way as the example below. Create a program in C/C++ reads a positive…
casked 6 years, 10 months ago user109930 -
-1
votes2
answers255
viewsMy program only runs the first if?
I need to work out an algorithm that takes 3 real values and checks whether these values can be the side lengths of a triangle, and in this case, return what kind of triangle is formed. Why x, y and…
-
-1
votes1
answer63
viewsLength and width calculation
Hello, I’m developing an application in Octave, which is very similar to Mathlab and C, which calculates the height and width of an object, which in this case is a seed. The program receives an…
-
-1
votes1
answer34
viewsI’m not getting these steps ! I wanted help
(b) Find the student with the highest score of the first test. (c) Find the student with the highest overall average. (d) Find the student with the lowest overall average. #define MAX 50 struct {…
-
-1
votes1
answer89
viewsI need help on this competitive programming issue
I’m asking the question Low Frequency I have tested the cases of Udebug but the online judge only returns me Runtime error, for what I know when this happens and when it tries to use memory position…
-
-1
votes2
answers71
viewsI can’t seem to register a person’s name in my calendar
I’m making a very simple schedule, the numbers I managed to castrate but the names of the people I couldn’t get. My code #include <stdio.h> #include <malloc.h> #define MAX 50 typedef…
-
-1
votes1
answer532
viewsHow do I return the number of items in a stack
******I did this Exercise , however in the count of stack elements, is not appearing the value of items Could help me please **** #include <stdio.h> #include <stdlib.h> /* Um elemento da…
-
-1
votes3
answers409
viewsSex selector on if parole
How would you do in this code to catch the sex of the person and display on printf()? I’ve seen many activities where in the condition of if, if he used too many numbers and hit me a question: And…
-
-1
votes1
answer228
viewsC: Sum between two numbers returns ASCII value or letter
Guys, I’m a beginner in the C language, I’m doing a challenge. #include <cs50.h> #include <stdio.h> long long n = get_long_long("Number: "); char card_number[15]; sprintf(card_number,…
-
-1
votes1
answer272
viewsHow to generate random value pairs
I wanted to generate 6 random values in 2 pairs for example 1 1, 2 2, 3 3 My code #include <stdio.h> #include <time.h> #include <stdlib.h> int vezes(int vetor[], int tamanho, int…
-
-1
votes1
answer80
viewsWhy is my string not converted to lowercase?
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <ctype.h> /* Lucas Correia Síntese Objetivo:Ler o nome de duas…
-
-1
votes1
answer169
viewsHow do I overwrite a string with another accent without?
I wanted to replace the accented characters with others without and generate a new string, only that there seems to be something wrong in the comparison I’m trying to do in the function…
-
-1
votes1
answer84
viewsDifficulty with If/ Else
Hello! How are you? I’m having a problem when I run my program, it’s a program to calculate four medias and divide by four, and it’s necessary to do this using If and Else, but when I run it, the…
-
-1
votes1
answer54
viewsWhy is my array not sorted? (Bubble Sort)
I fed the array with the user input, but the algorithm doesn’t give the output in an orderly way, which I did wrong? int main() { // variáveis int vetor[5] = {0}; int aux, i=0, j=0; printf("Entre…
-
-1
votes1
answer63
viewsProgram in C compiles but shows error in Output
#include <stdio.h> #include <stdlib.h> #include <locale.h> float bonus_a_receber(float salario, float perc){ float a_pagar; a_pagar = (salario * perc) / 100; return a_pagar; } int…
-
-1
votes1
answer68
viewsHow to Assign a Phrase to a line in a chars matrix?
I want to modify standard phrases from a theoretical game. For example, the game has the phrase "Choose a command" and, over a given state, I would like to exchange all letters "o" and "a" for a @.…
-
-1
votes2
answers562
viewsHow to use ("%10.2f",&d) in C I want the number to come out integer
#include <iostream> #include <stdio.h> int main() { int a,b,c,d; printf("Escolha Qual das equacoes se adequa a sua duvida de 1 a 3\n\n"); …
-
-1
votes1
answer2531
viewsinvalid operands to Binary % (have ' float' and ' int')
When I compile the code I get the error in the question title for the line res100=notas%100; How to solve ? Code: float…
-
-1
votes1
answer129
views -
-1
votes1
answer84
viewsHow to display the value of a query in C?
Rephrasing the question: I have a table in Mysql where I need to display the person’s name as soon as they type their ID. I’m making a code where I just try to do the search to see if you’re…
casked 6 years, 5 months ago Victor Fernandes 7 -
-1
votes2
answers91
viewsWhen inserting into a vector always overrides the previously inserted value
In my code when adding a contact (X), and see the contact list, I have contact X, however when adding another contact (Y), and go see the list, the contact Y replaces the X, how can I add several in…
-
-1
votes1
answer70
viewsdoubt in array
My program needs to receive two vectors, A and B. This defines the set To Pikachu B as the set formed by the elements that appear in A or B. In addition, it has the set To Chikorite B as the set…
-
-1
votes1
answer83
viewspassage by struct reference does not work (Dynamic queue C)
I’m trying to implement a dynamic Fila. When I start the program (start and end = NULL), and then place to queue a value (queue function) the pointer "end" receives the new queue item, but the…
-
-1
votes1
answer42
viewsError reading a string in file
Well I’m reading a file with the type formatting: name.txt names columns types columns Where I am able to read all these strings, but when printing them, for example in a row with two column names…
-
-1
votes1
answer634
viewsHow to compare string in text file with user imput and do validation?
At the end of this code, I’m trying to read the names of some countries and compare with user input, but I’m not getting results. It keeps repeating. If it finds, the program has to follow the flow…
-
-1
votes1
answer125
viewsSegmentation Error
Hello. Could anyone help me with this error (Segmentation fault)? I don’t know why it’s happening. #include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct cel {…
-
-1
votes1
answer102
viewscannot compare strings
I registered the code of the client and now I need to request again so I need to check whether there is or not registered code, only even if the codes are different or says that there is registered…
casked 6 years, 4 months ago Jhonatan Pereira 1 -
-1
votes2
answers221
viewsVector ordering problem in C
I’m trying to make this problem, but always the result goes wrong. "Make a program that creates a user-filled 10-position array. Scan the vector and whenever the value of position i of the vector is…
-
-1
votes1
answer55
viewsC PLIS HELP --> I want to create an array in a function and return it fully filled, but in my code it returns null
#include <stdio.h> char * criar_matriz() { char *matriz[8][10] = {}; matriz [7][3] = "*"; matriz [7][4] = "*"; matriz [7][5] = "*"; matriz [7][6] = "*"; for(int i = 0; i<8; i++) { for(int j…
casked 6 years, 3 months ago Lucas Brigido 11 -
-1
votes1
answer47
viewsBuild error when recording information in a struct and substruct
I have a problem with my C code. My goal is to register categories in my first struct, which occurs without problems. Then, I want to register some subcategories for each category, which causes the…
-
-1
votes1
answer55
viewsProblem with Double Chained List
My function - for now - can create a list and add items at the beginning or end of the list. But when calling the add item function, selecting 1 or 2, and entering the item, the program simply…