Questions tagged [pset4]
The standard edition of Problem Set 4 will move beyond C programming language basics, testing your knowledge of pointers, memory management, file i/o and structs.
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questions
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Incorrect blur for filtermore
for this problem, I have opted to use a strategy where I create a 1 pixel border in a copy image with RBG values = 0, to avoid running into segmentation errors when trying to access a pixel. I also ...
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1
answer
21
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filter-less blur function
I am stuck at pset4 filer-less, blur function. The duck and chatgpt say that my code is correct but it doesn't give excepted outputs in any of Check50 result for blur function.
//Blur image
void blur(...
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0
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49
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Little Professor check50 shows error even though program run completely fine
I'm facing an annoying issue while trying to validate my Little Professor results. I've ran the program several times and it does run as per the specs however when running the check50 it keeps on ...
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2
answers
35
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pset4 blur; artifacts on a white parts of an image
I believe I've done this part of filter-more task pretty well, but, unfortunately, an output image has some artifacts - blur works badly with white parts of an image.
void blur(int height, int width, ...
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1
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32
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Pset4- recover: recovered jpgs appear to be empty
I tried to implement recover through the simplest and shortest way I could imagine.
The code compiles and saves 50 JPGs with proper names, but when I open them, all of them are just empty and even ls -...
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1
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31
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Recover PSET 4 Week 4 - skipping while loop
This is a follow up to my previous question. After I went through my code on debug50 it shows that my while on line 35 is not going through. I checked my code with other others on this site and they ...
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29
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bitcoin excersise problem set 4
the code works in my pc but check50 find this error and I don't understand why:
Traceback (most recent call last):
File "/tmp/tmptndsrole/test_two_coins/testing.py", line 28, in
bitcoin....
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1
answer
33
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CS50 PSET 4 Recover - segmentation fault and blank file
I have been trying to solve this question for a while now but I am still not sure what is wrong. The program works fine before the while loop but after it stops working and when checking with check50 ...
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1
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34
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CS50 Recover Problem: Why does it give Segmentation fault (core dumped)
I have looked all over to see other people with issues with segmentation default on this problem. I don't see that i have the same issue and i am not sure what i did wrong
// Ensure proper command ...
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1
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99
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Why am I failing check50, Cs50p Little Professor
I get this reply after executing check50:
:) professor.py exists
:( Little Professor rejects level of 0
expected program to reject input, but it did not
:( Little Professor rejects level of 4
...
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1
answer
31
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Pset 4 Filter (More) -- PLZ HELP
When I declare the array earlier, I end up with the wrong output. But when I declare it inside the loop, the final output is correct.
Plz tell me how to explain this.
The wrong one:
void edges(int ...
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1
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CS50 Pset 4 edges: Why do I keep getting segmentation fault?
Please help me figure out what's wrong! I've been doing this pset for so long now, and I feel like everthing should work, But I just get a seg fault! The code looks like...
void edges(int height, int ...
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6
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I have an issue with my code in Pset4 Recover: It compiles right and makes all 50 needed images, yet there's no data seemingly in any of the images
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
// Defining a datatype for BYTEs
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("...
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0
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27
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CS50 PSET4 Recover. Files created, images visible, why check50 fail?
Why isn't check50 clearing even though the files are created and the images are visible?
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
typedef uint8_t BYTE;
typedef ...
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-1
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1
answer
34
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pset4 reverse confusion
Just checking, are we supposed to write each block we fread() from the input with each element in the same order as we read them from the input file, or are we supposed to write them with each element ...
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1
answer
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program is free of memory errors
Im about to finish pset4, currently on recover! Everything is ok at the first look, program compiles, however, there is a problem when I run check50. As you can see from the title, something is off ...
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21
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pset4 filter/more edge
My code compiles and run okay I does everything but when checking with check50 It shows error
My code is :
#include "helpers.h"
#include <math.h>
// Make a copy of array
void ...
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2
answers
46
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CS50 pset4 filters/less check50 error
I am trying to check my code using check50 but it gives me the error
But when I am compiling it and running it from the terminal it runs just fine.
My code for helper.c is
#include "helpers....
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0
answers
9
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Pset 04 Edges FIlter. I don't know whats wrong with the code
I've been trying to implement the function edges with an auxiliary one, determineEdges. It compiles, but generates, probably by an error, a black image.
I'm having trouble to figure out what is the ...
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21
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program in recover pset4, please help me find the errors and if you could add how to debug the code, its will be helpful
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("./usage: recover filename\n");
...
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votes
1
answer
19
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Problem with Edges Pset4
I've been at this Pset for a while now, I've got everything down except for Edges, and if I'm understanding correctly, every single value is coming out correctly except for the values for blue are 99% ...
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1
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14
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Pset 4 Filter - The Blur filter. I only pass the "Blur correctly filters pixel in corner" though I can see that the output is entirely filtered
Here is my code.. It seems to work fine. I just can't tell why can't I pass the stupid checker! Hope someone can assist me.
void blur(int height, int width, RGBTRIPLE image[height][width])
{
...
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0
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23
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Recover, Produces 50 JPGS but doesn't pass check50 and the memory leak check is neutral (can't check)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int check();
int main(int argc, char *argv[])
{
int name = 0;
FILE *fptr = NULL;
char filename[8]= {0};
int x = 0;
int i = ...
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0
answers
7
views
Having issues with PS4 Filter (Less) Blur Function
I feel like I'm really close to a solution to this problem, I just can't put my finger on where the issue is occurring any tips would be greatly appreciated.
void blur(int height, int width, RGBTRIPLE ...
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1
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19
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Can someone please help me in resolving this issue. I don't quite understand what I am supposed to change here
Ok, so apparently there are no compilation errors. But what exactly is happening here. Like, why am I getting this error?
P.S-Even help50 doesn't seem to be of much help here...
The actual code is as ...
0
votes
1
answer
12
views
Iterating over the members of RGBTRIPLE struct
The RGBTRIPLE data type specified in bmp.h has three members, and I want to be able to iterate over them like:
for (int k = 0; k < 3; k++)
{
printf("%i\n", image[i][j][k]) // prints ...
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0
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6
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No error when image array out of index
I wrote some code for reversing the image, and was finding one of the columns wasn't moving - realised I was indexing image[i][width] element, which didn't exist due to 0-indexing.
However it didn't ...
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1
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47
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my 'reverse' code works on wav files but it doesn't pass check50
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "wav.h"
int check_format(WAVHEADER header);
int get_block_size(WAVHEADER header);
int main(int argc, ...
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1
answer
54
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in pset4, recover, why is the first jpg found treated differently from the other jpg files?
I'm starting to work on pset4, recover, and (as you can tell) things are not going well. I read posts from other students working on the same problem and realize some of them check for the jpg header ...
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1
answer
26
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pset 4: recover only recovers grey and black squares
I am unsure on why my code is only recovering black and grey squares, instead of images. I have tried closing the file img in multiple places, and I still can't seem to solve the problem, I believe it ...
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1
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106
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cs50p pset4 bitcoin
According to the presentation of week 4, we can access to the dictionary element with the following expression:
o = response.json()
for result in o["results"]:
print(result["trackName&...
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0
answers
28
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Week 4 - Filter (More Comfortable) - Edge
I cannot for the life of me understand what's wrong here. It does apply a filter, but it looks too blue and doesn't pass the CS50 check. Any ideas?
void edges(int height, int width, RGBTRIPLE image[...
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1
answer
36
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PSET4 Recover Successfully Generates Images But Does Not Match Correctly
Currently on PSET4 Recover. My code manages to generate 50 images which can be opened, however check50 states the images do not match correctly.
Would anyone be able to offer some advice?
#include <...
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0
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11
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Reversing an audio file
I having been working on an audio file to reverse its contents but don't know why my code isn't working, kindly check:
BYTE audiodata[blocksize]; // blocksize is 4 in my case
int pointer = 1;
// file ...
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1
answer
15
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PSet 4 - Recover. The first picture (000.jpg) doesn't get recovered, all other images do (049.jpg is the last image recovered)
Everything else works in my code, no memory leaks, all other images are loaded properly, except the first one. I've gone through debug50 to try and see the problem, but I can't seem to find one since ...
0
votes
1
answer
36
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pset4 recover segmentation fault (core dumped)
I am getting segmentation fault and i was searching on the internet, comparing with other codes, reading this forum, etc. and i still can not fix mine.
Explaining my code from the while:
read the ...
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1
answer
26
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Pset4 Recover getting segmentation fault but I have no idea why
This is the answer I have come up with for pset 4 recover:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char *argv[])
{
// Ensure proper usage
...
0
votes
1
answer
34
views
What is wrong in my TODO 8? PSET04 - RECOVER
I'm Currently doing the PSET04 Recover. I've done all the TODOS, but in the last one, I think I have an error and I don't know why. Check50 prompts me everything is ok except for the last requirement. ...
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1
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Why does the 0.49 jpg file doesn't match correctly?
I'm doint the recover PSET04. I think, I've done everything correct expect of the 0.49 jpg file. It says that it doesn't match correctly. And the last error in Check50 is "can't check until a ...
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0
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12
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PSET04-filter more Edge Function. I need help, PLEASE!
I'm very confused why my code is not working. And there are these strange errors in the results of Check50, I don't know why. I know it could be complicated to read my code due to the amount of code I ...
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1
answer
12
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CS50 PSET 4 memory error on check50 but not on valgrind -s
I have no idea where to close the outptr.
My code CS50 generates the following memory error on check50 but no error on valgrind -s
running valgrind --show-leak-kinds=all --xml=yes --xml-file=/tmp/...
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0
answers
33
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PSET4 filter-less: black screen when running blur function
I am currently working on the blur function, in filter-less. I am greeted woth a black screen when I run the function, and I'm unsure what part of my code is causing this to happen. Here is my code as ...
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0
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16
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Can't figure out what is wrong with my blur code
void blur(int height, int width, RGBTRIPLE image[height][width])
{
// DEFINE ONE STRUCT TO ACT AS BUFFER MEANWHILE CALCULATING AVERAGE
RGBTRIPLE buffer[height][width];
// GO THROUGH EACH ...
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1
answer
127
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reverse .wav file not working correctly
I tried running this code to reverse the .wav audio file, but it does not work as required. Can someone explain what's wrong?
// create array of size (size) to store blocks
BYTE buffer[size];
// ...
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0
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79
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Professor Code Rejected by CS50 Check50
When submitting the code to check50, I get the following error message:
":( Little Professor accepts valid level
Cause: Timed out while waiting for program to exit."
When I run the program ...
0
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1
answer
26
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Problem set 4 recover producing only one image, that too is corrupted
here is my code:
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const int BLOCK_SIZE = 512;
int main(int argc, char *argv[])
{
// ensure ...
- 101
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0
answers
17
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Segmentation error in Recover Pset - any clues? A bit stumped
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "check_arguments.h"
#include "jpeg_file_structs_and_operations.h"
#include <stdio.h>
...
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0
votes
1
answer
18
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PSET4 Recover - Why do I get Segmentation Error from Check50
my recover program compiles fine.
When I run the program, I do not get any errors. When I look at the 50 outfiles, I can see the pictures with the image preview.
Valgrind indicates that there are no ...
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0
votes
1
answer
29
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P4 Recovers only first 512 bytes
im really struggling with this one and your help would be really appreciated
My code is working quite good but theres a error with writing file wich i cannot fix
// i will start with line where i ...
0
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0
answers
215
views
i having trouble with todo 8 in pset4 reverse
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "wav.h"
int check_format(WAVHEADER header);
int get_block_size(WAVHEADER header);
int main(int argc, ...
