Questions tagged [cs50x2020]

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“Error when executing query: too many statements at once” pset 7 movies

Hi! I wanted to know what this error message meant because all my sql statements give the correct output but submit50 shows that i've only got a 2/14 , "Error when executing query: too many ...
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31 views

PSET5 dictionaries won't load

I cannot get my dictionaries to load and cannot figure out why. Here is my load function: // Loads dictionary into memory, returning true if successful else false bool load(const char *dictionary) { ...
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1answer
20 views

incompatible pointer types passing 'string' (aka 'char *') to parameter of type 'string *' (aka 'char **')

Im writing a funtion that takes string as a argument and gives back a integer. This function counts lenght of a string entered at the command line argument. I get an error :" incompatible pointer ...
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1answer
20 views

Making code neater: a way to reduce repeated logical operators?

For CS50 pset1 Credit I'm using repeated logical-OR operators (||) to work out the validity and card brand of a credit card number. When I evaluate the style of my code using style50 it says to insert ...
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1answer
32 views

How do you find the first digit of a long number?

I wrote the following code to try to find the first digit of a long number (this is for the CS50x "Credit" exercise), but it's not working. Any tips? // Conditions and relational operators #...
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3answers
67 views

PSET 5 Hash help

I started my load function without looking at any reference code (first time starting a pset this way) to give me an idea on how to implement my own version. I was mostly confident until I reached the ...
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1answer
13 views

CS50 recover (fclose giving segmentation fault)

found a few answers to the segmentation fault issue in CS50 recover while closing the file but I couldn't translate the answers to my issue: The last part: fclose(f); fclose(img); is resulting into ...
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2answers
70 views

PSET 4 Reflect help

I am not sure why I am having issues with my code. I know I can store the rgb values for the left pixels in 3 temporary variables then assign the right values to the left and the temp values to the ...
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1answer
97 views

PSet 6: DNA gives correct as well as wrong ouput

Problem Set 6: DNA gives output No Match No Match No Match No Match No Match No Match No Match No Match No Match No Match Lavender No Match No Match No Match No Match No Match No Match No Match No ...
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1answer
90 views

PSet5 case-insensitive using strcasecmp

Tried iteration over strlen and random constant variable but unable to solve: :( spell-checking is case-insensitive expected "MISSPELLED WOR...", not "MISSPELLED WOR..." Here is my full code: //...
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2answers
27 views

PSET4 recover. Why doesn't my counter increase?

Below is my working code but I've a question. If change my char filename[8] to char filename[7] the counter does not increase. Instead, I'll only have 2 output files: 000.jpg and 001.jpg, where 001....
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42 views

Cs50x final project ideas

I just finished the web track and now I'm planning to do the final project but cant seem to figure out what I should make for the final project. Can I get some ideas for the final project?
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1answer
107 views

Pset2 Readability test fail “complex single sentence” Grade 9 instead of Grade 8

When using check50 or inputting the provided texts, my program passes all but one test; the "complex single sentence" test returns a Grade 9 instead of Grade 8 (Coleman-Liau index returns 8.785455 and ...
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1answer
37 views

bot50 invitation on me50

I found an email on my inbox saying "@bot50 has invited you to collaborate on the me50/MyGithubUsername repository" and I accepted the invitation. Is that something malicious?
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1answer
45 views

CS50 pset4 recover.c produces unsupported jpg images

Here is my code. Please help. #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <stdbool.h> #define BLOCK_SIZE 512 #define FILE_NAME_SIZE 8 typedef uint8_t ...
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2answers
104 views

PSET 4 Errors: where did I go wrong?

So after being stuck on this pset for overlooking tiny typos I have finally gotten it to compile but I received more errors then I would like to have. If anyone could tell me where I can find the ...
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1answer
10 views

it is about credit in pset 1 code (no error but doesn't work) it doesnt show amex or visa or mastercard just keeps prompting to enter again

#include<cs50.h> #include<stdio.h> int main(void) { long cc, wcc, d = 1; int sum = 0, n = 0, fd ,ftd; do { cc = get_long(" number : "); } while ( n < 0 ); ...
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2answers
44 views

PSET 1 Cash two inputs don't get appropriate value

I'm stuck trying to understand what's wrong with my code... When I check it I get this error message: :( input of 1.6 yields output of 7 expected exit code 0, not 1 But getting 7 coins for 1.6$ ...
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1answer
121 views

Problem Set 8 / Web Track - Finance (Redirect Error)

My functions seens to work fine, but when i have that redirect the user to the homepage (redirect("/")) the application crash and show the error message: 500 internal server error and I don't know if ...
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1answer
165 views

CS50 Blur issue

void blur(int height, int width, RGBTRIPLE image[height][width]) { RGBTRIPLE holder[height][width]; int red; int green; int blue; float counter; for (int i = 0; i < height; i++) { for (int j ...
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2answers
51 views

pset2 readability. cannot compile although int is declared and code is complete. could someone please look into?

#include<cs50.h> #include<stdio.h> #include<string.h> #include<ctype.h> #include<math.h> int main (void) { string text=get_string("text:\n"); // to count ...
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2answers
64 views

Pset1 Cash (in C) array increment error

Context; I'm trying to solve Cash by; Taking positive integer user input, saves as float "ch" for change. (this as an implementation detail) Create an array "coin_val" with coin value by descending ...
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1answer
417 views

pset3 Runoff help

My code compiles but the only functions that had no errors are the print_winner and eliminate functions. I have tried to solve the errors for the other functions with no luck. My errors with the ...
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0answers
17 views

Audit access of course

I audited this course on edx two weeks ago. There is no notification about expiration date of my audit access. Why? Is it available for me till the course ending date?
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1answer
52 views

Getting this error: invalid operands to binary expression ('int' and 'int (int)') in the below code on ps1 cash.c

#include <cs50.h> #include <stdio.h> #include <math.h> int biggestCoin (int num); int main (void){ float userinput; int changeOwed, coins; do { userinput = ...
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374 views

PSET6 DNA [SPOILER]

during solving the dna problem i had a hard time trying to work out the large database " the small one work just fine" anyway i reached to this abstract solution to get "scores" of the sample dna so ...
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1answer
157 views

Problem Set 4 - Filter (Blur)

I know its pretty lame and uninspired to hard-code each and every special case of the blur function, but somehow it still refuses to pass most of check50's tests (aside from the middle and edge pixel ...
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1answer
27 views

2019-2020 Progression bar red beside finished

I've start the CS50 late 2019 and finish it last week. I'm in this case: "If you submitted Problem Sets 0 – 4 last year, resume your studies with Problem Set 3 in Week 3 then skip to Week 6 and ...
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1answer
195 views

Pset4 filter reverse issue

I am banging my head for the past hour on why this does not work. Basically, testing on the provided pictures, my reverse function does what it says on the tin. However, when I test it vs check50, ...
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1answer
48 views

PSET2 Caesar isdigit function works opposite way

I am currently at CS50x2020 PSET 2 Caesar "validating the key" and having issue with using the isdigit function. From what I understand from the programmer's manual, isdigit will return 0 if the input ...