Questions tagged [help]
The help tag has no usage guidance.
77
questions
0
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0
answers
27
views
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 ...
- 1
0
votes
1
answer
23
views
CS50 Mario Less - Check50 Error
I recently started taking the CS50 class at Harvard, and I'll admit that I feel like I have hardly a clue at what I'm doing. It was a huge jump from the Week 0 to doing this. I'm halfway there to ...
0
votes
0
answers
87
views
I don't understand the answer to the pset3 atoi practice problem
#include <cs50.h>
#include <ctype.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
int convert(string input);
int number = 0;
int main(void)
{
string ...
- 35
0
votes
1
answer
17
views
Getting " error: declaration shadows a local variable" but i don't know why
int wordsize = atoi(argv[1]);
int status[wordsize];
for (int b = 0, wordsize < b; b++)
{
status[b] = 0;
}
The error happens specifically at the word "wordsize" in the for loop. I'm ...
- 35
1
vote
1
answer
360
views
Getting the error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type] and i don't know why
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>
bool only_digits(string s);
int main(int argc, string argv[])
{
if (...
- 35
0
votes
2
answers
144
views
Getting "using the result of an assignment as a condition without parentheses" error and i don't know why
for (int i = 0; n = strlen(argv[1]); i < n; i++)
{
if (isdigit(argv[1][i]))
{
return 0;
}
else
{
printf("Usage: ./caesar key\...
- 35
0
votes
1
answer
28
views
Getting "use of undeclared identifier" and can't solve it without ruining my code
i've been working on the mechanism to get every other number of the credit card number, and this is what i've come up with so far:
int get_credit(void);
int check_sum(int number, int a);
int ...
- 35
0
votes
1
answer
517
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 ...
0
votes
1
answer
152
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 ...
- 3
0
votes
1
answer
10
views
My friend uninstalled few things and now her VSC environment does not work
Comparing with mine, Few of her extensions are missing including CS50, CS50 phpLiteAdmin.
All of the ports have not populate in the beginning
She has error message when using update50, check50, or ...
- 1
2
votes
1
answer
28
views
Just getting started
Before I start the program, I wanted to hear more about the CS50. I haven't tried anything in Comp Sci or Programming before and honestly have no idea what to expect. Can anyone give me a little more ...
- 21
0
votes
1
answer
289
views
PSET 3 runoff is_tie function
New to this platform, forgive me if there are some norm or etiquette I may be missing. Please feel free to provide feedback on anything that is incorrect.
This is for the is-tie function alone. I ...
- 23
0
votes
1
answer
371
views
How do I get rid of the "expression result unused" error?
I am trying to get it to where if input "n" and "x" are the same number it will display "years = 0" if not it will run else statement. Instead it was running both the if ...
0
votes
1
answer
451
views
Cs50 IDE text is white no highlighted code Text editor not displaying color coded text Please help
I opened CS50 IDE hoping to work on a problem set and all the code I write is plain white text. No colors or highlighted code. It's just dead plain text.... Any suggestions?
0
votes
1
answer
3k
views
Fiftyville - please help!
I am quite sure about my answers... but still, check50 doesn't approve my answers... can you please tell me whether my answers are indeed wrong to start thinking about it again cause in my mind I am ...
0
votes
1
answer
61
views
make: *** No rule to make target 'population'. Stop. for population work
please help me. I don't understand why this is not working I tried to cd pset1 already but it still didn't work. I have been spending a lot of time to figure it out yet I can't. Please help me I would ...
0
votes
2
answers
946
views
My code gives error RuntimeError: no such table: File_Name
This is simplified version of my code
from cs50 import SQL
open("File_Name", "w").close()
db = SQL("sqlite:///File_Name")
id = 2
filename="hola"
db.execute(&...
0
votes
1
answer
334
views
cs50 mario MORE comfortable need LOTS OF HELP
so ive been stuck on this problem for a about a week, took lots of note and downloaded the lecture just look back on even took notes for the shorts on week one.
now what i clearly need is to be taught ...
- 3
0
votes
1
answer
196
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
1
answer
303
views
Pset2 Readability error: expected identifier or '('
I've been trying to compile this code but always get this error "error: expected identifier or '(' " for the line 13 (which is the first one starting with "for")
COuld someone help ...
0
votes
1
answer
59
views
pset 4 - recover. Can't figure out what is going wrong!
Can't figure out what I'm doing wrong, I've spent like 2 days on it already, please help!
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
if (argc != 2)
{...
1
vote
1
answer
33
views
pset 4 - recover, can't figure out mistake
I can't figure out what I'm doing wrong, please help!
#include <cs50.h>
#include <stdio.h>
#include <stdlib.h>
#define BUFFER_SIZE 512
int main(void)
{
// open memory ...
0
votes
1
answer
36
views
"cash.c:7:1: error: expected identifier or '('" What do I do?
I've been trying to compile cash.c, but for a reason, it always says I have an error in line 7... could someone help me find the error...? I tried different things to try and make it work but it does'...
1
vote
1
answer
1k
views
PSET 7 Movies SQL Q9
In 9.sql, write a SQL query to list the names of all people who starred in a movie released in 2004, ordered by birth year.
...Your query should output a table with a single column for the name of ...
0
votes
1
answer
60
views
CS50 Week 4 Recover. Generating 50 Blank images
Here is the code any help is greatly appreciated.
Thanks!
#include <stdio.h>
#include <stdlib.h>
#include <cs50.h>
#include <stdint.h>
#include <stdbool.h>
typedef ...
- 3
1
vote
2
answers
124
views
PSET3 Runoff Help Please
for(m = 0; m < voter_count; m++)
{
for(t = 1; t < 4; t++)
{
string name = get_string("Rank %i: ", t);
}
printf("\n");
}
}
bool vote(int voter, int rank, string name)
{
...
- 42
0
votes
2
answers
547
views
how do i write pesudocode.txt for Mario? (less comfortable)
After I input:
mkdir ~/pset1/mario
its asking me to write pseudocode.txt and i am not sure how i can do that. I've tried inputting the pseudocode.txt and that gives me "command not found"
0
votes
2
answers
189
views
are we supposed to use the set from hello.c to begin with Mario (less comfortable) or do we need a new terminal and file?
the first thing that the Mario instructions say is this : First, create a new directory (i.e., folder) called Mario inside of your pset1 directory by executing
~/ $ mkdir ~/pset1/mario.
I do not ...
1
vote
1
answer
50
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 ...
- 11
1
vote
1
answer
116
views
Cant get past the ls command in hello.c
I cant get past the List command in hello.c, and i'm not sure if i'm supposed to get something in the terminal after i type in ls, so i kept going and typed clang and i get the error message. I've ...
0
votes
1
answer
63
views
Stuck badly in Speller - segmentation fault
My first post here. I am fighting the 'speller' exercise for 3-4 weeks already, on and off. I think I've got the core of the code, but I keep running into a segmentation fault. Could someone please ...
0
votes
1
answer
63
views
Counter fails to update for DNA
My dna program always returns no match and after debugging it I've pin pointed the problem to the counter not updating correctly. My program finds the correct number of matches, which I've confirmed ...
- 1
0
votes
1
answer
268
views
[Week 2 Substitution.Why does my code fail the checks even if the output is correct?
Here is my code.
Apologies if it is hard to understand / messy.
When I check50 it shows this.
I have a brief idea on how to solve the invalid characters in key but I don't mind some help on that too.
...
- 1
0
votes
2
answers
116
views
Help with pset3 runoff
is this correct for vote function..struggled to figure out how to access candidate index so not sure if this is correct..any help/advice would be greatly appreciated
bool vote(int voter, int rank, ...
- 1
0
votes
1
answer
147
views
pset1 less comfortable mario
Somebody please help me I have watched the walkthrough thrice, many different videos and searched for answers on reddit and stackexchange yet i've been stuck at this for hours now and cant get through....
- 30
0
votes
1
answer
796
views
Using submit50 on VSCode
I'm doing CS50 AI and as a result been using submit50 in VSCode via the Windows Subsystem for Linux. Until I updated my IDE to the April update, submit50 used to ask my GitHub username and password in ...
0
votes
1
answer
24
views
Error message help
I am receiving an error that states my first curly brace is bad. I have copied this code from lecture 1 and tried to run it because I keep seeing the same error. I believe that my code is identical ...
0
votes
1
answer
223
views
My DNA code works with the small database but not the large one
My code works perfectly fine with the small database but gives "No Match" for the large one and I can't figure out why. Any help would be appreciated!
import csv
from sys import argv, exit
def main()...
0
votes
1
answer
46
views
PSET 2 IDE Compiling Issues
I am now on PSET 2 and moved to the CS50 IDE, however, when trying to set up and test the IDE by writing and compiling a simple piece of code under the title readability, i get the below error. I ...
0
votes
1
answer
73
views
One tiny step to completion. Recover recovers all images except the first one. Help!
Alrighty. I just need someone to point out to me where the issue is so i can finish this thing. submit it. and move on. i'm so so close. so help would be greatly appreciated.
// include libraries
#...
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0
answers
43
views
Help on Pset5 Speller
bool load(const char *dictionary)
{
// Open dictionary
FILE *dict = fopen(dictionary, "r");
if (dict == NULL)
{
printf("Could not read.\n");
return false;
}
...
- 1
0
votes
1
answer
102
views
Setting Up PSET 1 IDE Issues
On getting into the PSET 1 IDE i just seem to have a completely empty IDE. For example when i follow the instructions on the CS50 PSET1 Page i get the following:
~/ $ update50
bash: update50: command ...
0
votes
1
answer
465
views
Recover cs50 Please help!
Can somebody please help with this question?
... and also I tried to debug and apparently it doesn't run my while loop and i don't understand why.
while (fread(buffer, 512, 1, fraw) == 1)
so ...
1
vote
1
answer
90
views
PSet1: Mario - Less Comfortable (Too many periods)
I recently just tipped my toes into the water of CS50 last week, I'm completely new to this so I need a bit of constructive critisism. I was completed stumped at first, but I got somewhat close - not ...
- 13
0
votes
1
answer
35
views
PSet 3 resize (less)
I'm just trying the "resize horizontally" step for now, but I'm dreadfully confused and can't get it to work. Could someone take a look at my code and nudge me in the right direction? Thank you:
/...
- 3
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votes
1
answer
68
views
Help in PSET1: Credit. Check50 not showing up
I finished (what I think) is a correct version of credit and when I submit, I only see marks for style and no check50 on the submit50 page.
Also, when I do check50 in the terminal window, I get a "...
0
votes
1
answer
144
views
Where am I going wrong in Similarities: Substrings?
I am currently working on PSet7: Similarities. I have completed all the tests so far except substrings and I was wondering if any of you could tell me where I am going wrong. I am currently failing ...
0
votes
1
answer
46
views
resize : pset3 not all colors are appering after resizing
so im trying to resize an image of green square that has a smaller white square inside it and when i do the resizing the green square resize but the white one disappears i'dont know where the problem ...
- 5
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votes
3
answers
774
views
I am ABSOLUTELY STUCK! (mario less)
Ok, I have tried and have gotten a 60%. I need at least a 70% to pass. Please. Help. Me. Please. Tell. Me. What. Do. I. Do. I am done cash and now I'm stuck on this! Here is my code:
#include <...
- 13
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votes
1
answer
58
views
Why is my ciphertext printing random values?
I am currently working on Vigenere. I have the code to where it will work if the key is very short (a few characters), but for some reason my program bums out when the plaintext is long or the key is ...