Questions tagged [c]
The c tag has no usage guidance.
536
questions
0
votes
1answer
22 views
PSET3 Tideman - What to do with the lock_pairs function?
Can someone please help me with the lock_pairs section of the problem? The lock_pairs function is killing me. I get that you have to compare the pairs to each other and then return false or true in ...
0
votes
1answer
16 views
PSET 1 Credit Card Checksum doesn't add up
I'm having my issues finding the right answer as this is non code related.
The checksum says: "If the total’s last digit is 0, the number is valid!"
This is a credit card number that is ...
0
votes
1answer
15 views
question on Week 1 lecture
I just have a small question. David showed how to compile the source code "Hello.c" file using the make command to make the executable machine code file "Hello" in the lecture. I ...
0
votes
1answer
27 views
Credit (Pset1) - Checksum problem
so I have a problem with the Credit exercise from pset1. I updated my code today after realizing that I didn't split up the digits of the product of the current digit in the card number and 2 and ...
0
votes
1answer
8 views
Command debug not found
when I try to run the command debug
debug ./scores
the message that returns is that :
Command 'debug' not found
0
votes
1answer
18 views
stuck on readability pset2
Hi I am stuck on readability and am not sure what i am doing wrong
$ ./readability
Text: one fish. two fish. red fish. blue fish
8
3
42
13
Grade 13
and my code:
#include <stdio.h>
#include <...
0
votes
1answer
96 views
Lab 8 // Resetting button colors not working properly
I am doing the lab 8 trivia question and I am try to reset all the colors of the buttons when you press another from the rest. I am not sure how to do it. I have the function for resetting the colors ...
0
votes
1answer
14 views
PSet3 Tideman , error with updating ranks array
bool vote(int rank, string name, int ranks[])
{
for (int i = 0; i < candidate_count; i++)
{
if (strcmp(name, candidates[i]) == 0)
{
ranks[rank] = name;
...
0
votes
1answer
16 views
I have included all the libraries, yet it shows errors (pset2)
This is my code:
#include <stdio.h>
#include <cs50.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
int main (int argc, string ...
0
votes
2answers
49 views
Speller.c, get correct result on my machine, wrong on check50
Good day,
I am struggling with speller.c. When I run the program on my machine I get the correct result compared to the keys but then when I use check50 to check I get all wrong.
I have narrowed the ...
0
votes
2answers
28 views
Check50 accepts all but last 2 tests. pset1/credit
I've been trying to fix this on my own for a bit but I wasn't able to find an answer online. My credit program passes all check50 test's except for the last two (identifies 4111111111111113 as INVALID ...
0
votes
1answer
61 views
My do-while loop does not work
do
{
number = get_long_long("What is your credit card number? ");
}
while((number < 1000000000000) || (number >= 10000000000000000));
This loop is not accepting inputs. I do not ...
0
votes
2answers
34 views
What modification do I need to shorten my code?
I have come up with the following code to solve caesar.c of pset2. It passes all check50 tests. However, it fails to detect when a string input is not a number. The way I understand it, I have to ...
0
votes
1answer
22 views
Why is my if else statement not working?
Here's my Code:
#include<stdio.h>
#include<cs50.h>
int main (void)
{
string a= get_string("Enter a name\n");
string b= get_string("Enter Class\n");
...
0
votes
1answer
47 views
I don't understand the comments from check50 on my lab 1 submission. could anyone help please?
This is my code
#include <cs50.h>
#include <stdio.h>
int main(void)
{
// TODO: Prompt for start size
int s;
do
{
s= get_int("Start size: ");
}
...
0
votes
1answer
32 views
pset4 Blur calculation does not work properly
for some reason I can't get my calculation for the blur value running. The pictures are really odd and contain crazy colors. Any ideas to why this could be the case? I compared it already to working ...
0
votes
1answer
38 views
Mario less, struggling with nested FOR loop
hello I have got my code to work but don't understand logic, I found a flow cart for how nested for loops work and with that I was able to mix things around until I got it to output correctly but ...
0
votes
1answer
15 views
How can i arrange the output in decending order In this program? [closed]
#include <stdio.h>
int main()
{
int n,i;
printf("Enter a number: ");
scanf("%d",&n);
for (i=0; i<=n; ++i)
{
if (i%(7*13*19)==0)
{
...
0
votes
1answer
17 views
Why is my get_positive_int code not working? (I seem to do everything right!)
Here's my code (written in C), I was trying to program this for a long time, and even when I just tried to copy the code directly from the video lecture, it's wrong! Please help me.
Here's my code:
#...
0
votes
1answer
6 views
Caesar - ASCII to char conversion problem
Going through the CS50 exercise Caesar, and I'm still very new to C. My code to validate the key is all working, but as I try to convert from plaintext to the cipher text I keep getting caught up with ...
0
votes
1answer
22 views
pset4 recover creates 50 images but bytes don't match up
My code creates the 50 files, all of them starting with the correct JPEG signature, however the rest of the bytes don't match up. In other words, first 4 bytes are correct, the following bytes are ...
0
votes
0answers
8 views
Pset4_ Blur: (more comfortable)Problem, I think there is a small bug, but I can't find it
I was working on my code(sorry for it being so long), then I kept getting the same error and I don't understand why
:) blur correctly filters middle pixel
:) blur correctly filters pixel on edge
:) ...
0
votes
1answer
31 views
Pset3 Tideman: Why is my sort_pairs function not working?
I'm green on all the criteria before sort_pair. Here's my code so far:
// Sort pairs in decreasing order by strength of victory
void sort_pairs(void)
{
// TODO
// Create array of strengths of ...
-1
votes
2answers
22 views
while (n<1) --— Why?
Week 1 - mario exercice.
Into the program below , I do not understand why
while (n<1)
As width is a positive value, n shouldn't be >1 ?
-----------------------------------------------------------...
0
votes
1answer
23 views
String to Char in C
How can I convert a String to a Char in C? Please help. I am unable to do that and I need it urgently. I need it for readability.
0
votes
0answers
20 views
Help, doe not working - cash [duplicate]
Can someone please help me, as much as I think it should give the least amount of coins needed but it is not.
0
votes
1answer
34 views
Code not working - cash
Can someone please help me, as far as I think this code should give back the number of coins needed but it is not working.
0
votes
1answer
14 views
Seg fault (storing file pointer as NULL initially maybe?)
// img file pointer
FILE* img = NULL;
char* file_name = NULL;
int file_count = 0;
int bytes_written = 512;
// repeat until end of memory card
while (bytes_written == 512) // ...
0
votes
2answers
34 views
Blur look correct but check50 says its not?
See my check50 results here
// Blur image
void blur(int height, int width, RGBTRIPLE image[height][width])
{
RGBTRIPLE tmp_image[height][width];
for (int y = 0; y < height; y++)
...
0
votes
1answer
15 views
reflect for cs50. Trying to reflect an image, but only the first row pixels is swaped
So, my task is to reflect image pixel by pixel to make a mirror image. Here is my original code for the function
void reflect(int height, int width, RGBTRIPLE image[height][width])
{
int tempr, tempg, ...
0
votes
1answer
19 views
how can I rewind the fread() funtion as byte
is there a way to fread() the same bytes you just had read?
fread(buffer, 512, 1, inptr);
if (header(buffer) == true)
{
//execute these lines
do
{
//execute these lines
}
...
0
votes
1answer
36 views
Pset 4 Filter(less) Blur
I'm having an issue with the counter variable of my code. I wrote a printf to see if it returns 4, 6, or 9. Which is what it should do, if my IF conditions are correct.
Unfortunately it does not ...
0
votes
1answer
101 views
pset3 tideman lock_pairs: why does “lock_pairs locks all pairs when no cycles” fail?
My code fails at check50 but I can't understand why. It that seems my code actually finds cycles, but also produces false-positives (I guess).
check50 output for the lock_pairs function:
:( lock_pairs ...
0
votes
1answer
13 views
I finally got my code to work but now I can't submit it can anyone tell why?
tps://i.stack.imgur.com/SvfAI.png
0
votes
1answer
57 views
pset1 credit: I am unable to identify what's wrong in the logic of my code?
Kindly tell me what mistake have I made in this program? pset1 Credit: (my code) https://pastebin.pl/view/5646dbf1
0
votes
1answer
63 views
pset3 tideman cs502020 locked pairs error
I am new to coding and I am trying to solve the locked pairs part of the Tideman problem.
Currently, I am receiving the following two errors:
:) lock_pairs locks all pairs when no cycles
:( lock_pairs ...
0
votes
1answer
18 views
What is the purpose of subtracting 1 while inside a increment? [closed]
I am confused about the code below
++counts[number-1];
What is the purpose of subtracting 1 in this code?
The entire code:
#include <iostream>
#include <iomanip>
#include <ctime>
#...
0
votes
2answers
47 views
Check50 all green but my own tests fail
I completed Runoff with 100% pass in check50 but when i do my own tests i get wrong winners. I checked everything to the best of my abilities but i just can't find the problem and it's driving me ...
0
votes
1answer
106 views
cs50 array initializer must be an initializer list
i have started coding in c but i keep getting errors i don,t know how to solve
maybe it is because i am used to coding in php language but i hope anybody can help me
#include <stdio.h>
#include &...
0
votes
1answer
10 views
Strange CL output
I was testing my code to see if the command line argument's characters are digits but after plugging a random argument that was a mix of letters and numbers, I obtained a strange output. See what you ...
0
votes
1answer
25 views
Pset 2 - Readability -> Wrong grade
I'm having problems with the Pset 2 problem: readability.
The goal of exercise is to implement a program that computes the approximate grade level needed to comprehend some text using the Coleman-Liau ...
0
votes
1answer
53 views
Error: function definition is not allow here What error is this?
main.c:10:24: error: function definition is not allowed here
int read( int a[9][9]){
^
main.c:36:24: error: function definition is not allowed here
void show(int a[9][9]){
^
main.c:58:24: error: ...
1
vote
2answers
76 views
pset2 - readability - grades slightly off
I have a problem that I have not been able to diagnose on my own or by perusing this stack overflow.
The the tests are here.
All of the index values are correct except for the grade seven sentence ...
0
votes
2answers
44 views
Segmentation fault error in pset5
I did the speller and had some errors that I solved, but now I'm stuck and need help.
I debug the load and hash (I know it's not ideal, but it works:))
Now I'm receiving the Segmentation fault error ...
0
votes
1answer
40 views
cs50 speller code complies and run also successfully. but it not qualifying for big board
:) dictionary.c and dictionary.h exist
:) speller compiles
:( qualifies for Big Board
expected exit code 0, not 139
:| passes benchmarking
can't check until a frown turns upside down
how to fix this
*...
0
votes
0answers
31 views
cs50 pset3 tideman lock pairs and print winner function are not working rest all are working
in lock pair (lock_pairs skips final pair if it creates cycle is working) rest all lock_pair and print winner is not working.
#include <cs50.h>
#include <stdio.h>
#include <string.h>
...
0
votes
0answers
4 views
Json header file for C
Is any header for json in C, form which we can parsh any json file of 2D, 3D , etc.
or is any other way to work with json in C programming language.
from which we can parsh our json data and get it ...
0
votes
1answer
17 views
this code generates wrong results
I have some issues with this code it just prints the very first part of the image right and the rest of it just a gray screen can anyone help please.
#include <stdio.h>
#include <stdlib.h>
...
0
votes
0answers
10 views
This code gives wrong results
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("Usage: ./...
0
votes
0answers
32 views
tideman sort pairs not working
dont know why my function isn't working, i suspect the while loop triggers even when it shouldn't.
void sort_pairs(void)
{
// TODO
supair supairs[pair_count];
supair unSorted[pair_count];
...
