Questions tagged [cs50x]

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PSET04 Filter EDGE FUNCTION HELP!

I'm doing the filter-more pset. And I got errors in the edge function. I don't know why the intensity of each channel color per pixel are different than the correct ones. Maybe, I'm doing wrong about ...
AlvaroAndLukeTheCoder's user avatar
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in the Substitution problem in Week 2 Array, I want to pass the output from a function to the main

string makecipher(string plaintext, string key1) { int lentext = strlen(plaintext); // printf("%i",lentext); char ciphertext[lentext]; for (int i = 0; i < lentext; i++) {--some code--- ...
Asif Dawood's user avatar
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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 ...
AlvaroAndLukeTheCoder's user avatar
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Why is this happenning while getting the RGB results? - PSET04 FILTER (BLUR FUNCTION)

I'm doing the PSET04 (Filter-Less). And I got some errors in the last function (Blur), I don't know why the RGB Colors are different than the correct ones. Please help me, i'd appreciated. Current ...
AlvaroAndLukeTheCoder's user avatar
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Hi guy!! Could you please help me with CS50 week 3 runoff on tabulate function?

here is my code void tabulate(void) { // TODO for (int i = 0; i < voter_count; i++) { for (int j = 0; j < candidate_count; j++) { for (int k = 0; k < candidate_count; k++) ...
Ethanboom's user avatar
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1 answer
20 views

Pset5 Speller - trying to understand more about segmentation fault

I tested a piece of code to figure out what's causing the segmentation fault with the 'load' function. The code below opens the large dictionary. Then it scans and prints each string inside the ...
Soumik's user avatar
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1 answer
140 views

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]; // ...
Ahmed ElToukhy's user avatar
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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 ...
RedHorseMane's user avatar
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1 answer
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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 ...
Martund's user avatar
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Week 1 Lab 1 Population size

Im currently working on Lab 1 regarding the population size of llamas, and everything went smoothly however even though I am in the population_size folder and inside the file population.c right now, ...
Shawn Lim's user avatar
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1 answer
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Nested for loop not returning to parent in substitution.c

I have a nested for loop of for(int i = 0; i < strlen(key); i++) { for(int j = i + 1; j < strlen(key); i++) { if(toupper(key[i]) == toupper(key[j])) { ...
user21380365's user avatar
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581 views

I need help to fix my selection sort code - Practice Problems (Average High Temperatures)

I need help fixing my code. I don't know what else to do, I've been trying to sort all the temps array in descending order. But I don't know what I'm doing wrong. Can you help me saying what things I ...
AlvaroAndLukeTheCoder's user avatar
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0 answers
61 views

CS50 python problem set 1 bug

about the problem set 1 (bank), I have wrote the "bank" codes correct and tested several times and it works but still edx check think the codes are incorrect. is it vocode or GitHub bug or ...
meiqdad's user avatar
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PSET 5 "SPELLER" : Why this hash function resulting in SEGMENTATION FAULT(core dump)?

If i run it in another smaller program it works fine( returns the key correct) but on the pset 5 speller it gives segmentation fault. why?
Sharyar Javaid's user avatar
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1 answer
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this program is supposed to be greedy algorithms that meant to count the number of coins to make the change owed = 0 , the output is always less by 1

#include <cs50.h> #include <stdio.h> int get_cents(void); int calculate_quarters(int cents); int calculate_dimes(int cents); int calculate_nickels(int cents); int calculate_pennies(int ...
ssan's user avatar
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pset2 - Bulbs - reversing array turns out wrong

I managed to make the right sequence of binary code (in reverse). Next, I do a for loop for reversing it, but it prints out wrong. I have no idea what happens, as the original array is correct, ...
yogmel's user avatar
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1 answer
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cs50x Pset5 Speller has a memory leak that I can't find

I am currently taking CS50x and am on Pset5: Speller. My code works as intended, however when I run the check50 function my program fails Valgrind. This is particularly confusing to me because when I ...
Zach Anderson's user avatar
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65 views

pset 3 tideman - vote function - rank int

I am having trouble figuring out how to set up the rank integer in the vote function of pset3. I could do this to ask the user to rank the candidate, but I assume that wouldn't work with the sample ...
Joseph J Filoramo's user avatar
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1 answer
85 views

Why do the recovered images do not match (pset4 recover)

#include <stdio.h> #include <stdlib.h> #include <stdint.h> int main(int argc, char *argv[]) { typedef uint8_t BYTE; FILE *file = fopen(argv[1], "r"); int counter=0; FILE *...
daydayday1234's user avatar
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1 answer
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Pset3 runoff: why does the is_tie function work one way but the inverse does not?

I completed the problem set runoff and finally got it after initially way overthinking. I often find myself just needing to invert/revert logic on these problem sets which is frustrating because I ...
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1 answer
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Invalid vote while testing Tideman problem

am working on Tideman.c problem. When I go to test the code by doing the following: -cd Tideman.c -clang tideman.c -lcs50 -./tideman Alice Bob Charlie -Number of voters: 3 -Rank 1: Alice "Invalid ...
BaaBaa's user avatar
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1 answer
269 views

PSET2 Substitution

#include <cs50.h> #include <string.h> #include <stdlib.h> #include <ctype.h> #include <stdio.h> int main(int argc, string argv[]) { // Checks if there are two ...
Chi Go's user avatar
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1 answer
459 views

expected to find "112.00" in page, but it wasn't found on PSET 9 - FINANCE

it is my first time asking here as I've tried various methods and solutions but still unable to solve this problem. I always get stuck on "buy handles valid purchase - expected to find "112....
KiruFlan's user avatar
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2 answers
51 views

Hello guys... Good day. I'm currently on the pset 4 (recover). program is working well, but the (valgrind) requirement in the check50 isn't checking

#include <stdio.h> #include <stdlib.h> #include <stdint.h> typedef uint8_t BYTE; int main(int argc, char *argv[]) { // Check that command-line arguments is 2 if (argc != 2) ...
Hendrix obuks's user avatar
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2 answers
198 views

Valgrind error in pset5 speller

newbie here this is my first post, I hope you guys can help me! I am stacked with speller, my program works apparently fine but the valgrind test outputs some errors that I can't understand. I have ...
turo's user avatar
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0 votes
1 answer
75 views

I get Segmentation fault (core dumped) in Caesar

I'm trying to solve the Caesar pset, and I think I'm mostly on the right way, but I just started getting the error "Segmentation fault (core dumped)". I've attached the code, hopefully ...
rasmusschaal's user avatar
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2 answers
17 views

Getting segmenatation fault even though i freed memory

#include <stdio.h> #include <stdlib.h> #include <stdint.h> typedef uint8_t BYTE; int main(int argc, char *argv[]) { // Only allow 2 command line arguments if (argc != 2) ...
lukadeving's user avatar
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2 answers
827 views

How to set loop limit on an array with unknown size

I have been thinking about looping through arrays whose sizes are not fixed in advance... for example, allowing a user to input as many elements into an array as they want. Question 1: How would I set ...
Joseph J Filoramo's user avatar
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1 answer
101 views

CS50 PS9 finance :( buy exception raised in application: TypeError: '<' not supported between instances of 'str' and 'float'

@app.route("/buy", methods=["GET", "POST"]) @login_required def buy(): """Buy shares of stock""" if request.method == "GET": ...
Karl Kuehn's user avatar
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1 answer
22 views

Pset 4: Why Error at end of checkcs50?

this is how my code looks. Only *filename has a malloc attached to it. Why this valgrind error. This is how the logs look.
Atharva Deodhar's user avatar
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1 answer
34 views

cs50 ide problem

every time I write a code and I wnat ot run the simple programme I can't. I tried to do everything I know, I made make hello and gcc hello.c, no one worked and give out message that tell me "bash:...
Mohamed Reda's user avatar
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1 answer
40 views

pset2 substitution - handles multiple duplicate characters timeout

One last issue with my Substitution code. I keep getting the following error when I run check50: :( handles multiple duplicate characters in key timed out while waiting for program to exit My solution ...
Joseph J Filoramo's user avatar
0 votes
1 answer
46 views

pset2 substitution, segmentation fault

So my code for pset2 Substitution works about 99% correctly. When I ran check50, I realized that there is still an issue if the user does not type the key right after the program name at the command ...
Joseph J Filoramo's user avatar
0 votes
1 answer
21 views

pset 2 Substitution - extra char(s) in output

So I’ve figured out 99% of the code for the substitution problem. My plaintext input is being output correctly, with the correct enciphered letters and the correct case. However, I keep getting extra ...
Joseph J Filoramo's user avatar
1 vote
2 answers
1k views

check50 error message when testing test_fuel.py

:) test_fuel.py exist :( correct fuel.py passes all test_fuel checks expected exit code 0, not 2 :| test_fuel catches fuel.py returning incorrect ints in convert can't check until a frown ...
user3348445's user avatar
0 votes
1 answer
171 views

Undeclared Identifier error in array

In the code below (photo), I am trying to index into the two different arrays, one with capital letters and one with lowercase letters. When I make this program, I keep getting the following error ...
Joseph J Filoramo's user avatar
0 votes
1 answer
40 views

pset 5 speller, turning frowns upside down

I thought i had wrote a correct programme for speller, check 50 says that my code compiles but that is all it does! I have been running my programme and combing through each function and I still can't ...
Jay Donoghue's user avatar
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1 answer
42 views

How to get accurate float average of numbers

I'm in Lecture 2 on Arrays, and I am playing with the example Professor Malan gave about taking a user's input for the number of test scores, as well as for the scores themselves, and outputting the ...
Joseph J Filoramo's user avatar
0 votes
2 answers
60 views

How to output each element of an array

In the Lecture 2 Short on Arrays, Doug Lloyd suggests that it would be a good practice problem to try to output each element of a 100-element array as an integer corresponding to its index position. ...
Joseph J Filoramo's user avatar
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1 answer
34 views

How to Add results of a for loop

any ideas on how I could add the results of a for loop in C? I'm currently working my way through lecture 1, so I only know a few skills in C so far. My for loop does what I need it to do - it outputs ...
Joseph J Filoramo's user avatar
0 votes
1 answer
20 views

Week 7 Regular Expressions - Why is re.search(".@.", email) returning valid for "a@bc" and "aa@b"?

Why is re.search(".@.", email) returning valid for "a@bc" and "aa@b" ? To my understanding "." is used to represent any single character except a newline. So ...
pythonlover20's user avatar
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2 answers
32 views

Mario-less Style50 problem, the test is wrong, how to solve

The problem is that style50 highlights the printf(" "); function, everything works, if there is printf("-"); it doesn't say anything, but i need there space not a line. }
AAG MONCH's user avatar
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1 answer
707 views

Readability CS50

I've coded this solution for the readability exercise of CS50 Week 2, but after three long days I really don't see where I went wrong. It compiles and calculates the right number of words, sentences ...
Guillermo Gil de Avalle's user avatar
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1 answer
174 views

check cs50 pset9 finance buy and sell errors

:( buy handles fractional, negative, and non-numeric shares expected status code 400, but got 200 :( buy handles valid purchase expected to find "112.00" in page, but it wasn't found :| sell ...
Hope Braga's user avatar
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0 answers
45 views

CS50x pset 4 - Recover = correct code, no jpegs?

I've been working on CS50x pset 4 - Recovery and check50 is saying that I have done everything correctly. The problem is that I don't see any jpgs in the folder. What do I seem to be doing wrong? #...
Raymond Agustine Santos's user avatar
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1 answer
19 views

how can i get for it reprompt if the user types negative integer or number more 8 . my code does the oppoiste of what i want it to do how do reprompt

I want to prompt user for range to print something but if it user puts negative or more 8 to reprompt.
Abdullahi Omar's user avatar
0 votes
3 answers
108 views

cannot compile code

the code and the terminal message photo I have tried to compile this file as an application to make number input in arrays and then get the average of these numbers but the compiler always sends this ...
Mohmed Sameh's user avatar
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1 answer
660 views

pset3 Tideman record_preferences

Even from my view it's not the most effective solution, but I though it should work properly, however I can't really understand my mistake. Check50 says the function works incorrectly. void ...
mr_c00per's user avatar
0 votes
1 answer
87 views

pset2 - caesar : output is providing extra symbols after specific input cases

If someone has the time to explain to me how I can fix my code that would be greatly appreciated! Thanks :) Problems that I need help with: 1 - Program needs to accept single character inputs like 'a' ...
karlares's user avatar
0 votes
1 answer
35 views

pset2 readability test not calculating correct grade

I believe I've written the readability.c program correctly to count letters, words, and sentences based on readability prompt and calculate the grade index. But whenever I test the grade index, I'm ...
karlares's user avatar

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