Questions tagged [untagged]
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85
questions
0
votes
0answers
4 views
Why do we have to save both x, y coordinates as well as the corresponding grid in Match3 CS50 GD?
function generateBoard()
local tiles = {}
-- each column of tiles
for y = 1, 8 do
-- row of tiles
table.insert(tiles, {})
for x = 1, 8 do
-- tiles[y] will be the ...
0
votes
0answers
9 views
two finger print sensor on arduino uno
good day
i am trying to do a project where two fingerprint sensor work at the same time ..for entrance and exit.
but for some reason only one works and if i comment out the other, the one that was ...
0
votes
0answers
5 views
Is CLE credit available in Illinois for CS50L
Has the CS50L course been pre-approved by any state bar association for CLE credit, and specifically in Illinois? If not, has any CS50L student submitted the course for independent study CLE credits ...
0
votes
1answer
110 views
Error when fetching data from Heroku Postgresql: AttributeError: 'NoneType' object has no attribute '_instantiate_plugins'
I am getting the following error while fetching data from Heroku,
Traceback (most recent call last):
File "list.py", line 6, in <module>
engine = create_engine(os.getenv("DATABASE_URL"))
...
0
votes
1answer
90 views
cs50.me problem
I have been away from CS50 for some time and have now returned to it. I understand that CS50 IDE is no longer used and I have read:'If you started CS50x before 2018, know that scores from CS50x 2017 ...
0
votes
1answer
51 views
PSET5: Serve Greyed Out/ CSS Changes Not Reflected on Page Despite Saves
I'm on to working on my extra HTML and CSS pages for PSET5. I've run HTTP-SERVER, clicked on Port 8080 and selected Open where upon I get a directory tree and select the HTML file I want to run. ...
0
votes
1answer
232 views
I really want to use Express and Node JS for my final project - is this possible?
I got the app running fine in the terminal but can't seem to get it going in the browser. This is where it should run:
https://-.c9users.io
I tried inserting my username and the workspace name which ...
0
votes
1answer
14 views
Why is my program rejecting “Hax0r2” in vigenere.c?
#include <stdio.h>
#include <string.h>
#include <cs50.h>
#include <stdlib.h>
#include <ctype.h>
int main(int argc, string argv[])
{
int j = 0;
int m;
int l;
//checks ...
0
votes
2answers
75 views
calling square function
#include <stdio.h>
#include <cs50.h>
int square (int x);
int main(void)
{
int x = get_int ("x:");
printf("%i\n", square(x));
}
int square (int x)
//here in this line which ...
0
votes
1answer
25 views
Hey guys i am new in cs50 and i am struggling to submit my CaeserCipher assignments please help
please assist I really need to submit my work.
0
votes
2answers
669 views
expected identifier or '(' { error
I'm trying to run this code and here's the error that i get:
clang -fsanitize=signed-integer-overflow -fsanitize=undefined -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wshadow zeki....
9
votes
1answer
2k views
cs50w project1 - AttributeError: 'NoneType' object has no attribute '_instantiate_plugins'
I am trying to import the books.csv file into the online PostgreSQL database via Python code, as shown in the lectures and I get this error message when sqlalchemy is attempting to create the engine. ...
0
votes
1answer
82 views
why cant i use the hexadecimal codes in my program?
whodunit.c:77:40: error: invalid digit 'f' in octal constant
if (triple.rgbtRed == 0000ff)
whodunit.c:79:33: error: equality comparison result unused [-Werror,-Wunused-comparison]
0
votes
1answer
19 views
i cant unzip my whodunit file even after downloading it from the given website from cs50. help me out
~/workspace/pset4/whodunit/ $ unzip whodunit.zip
unzip: cannot find or open whodunit.zip, whodunit.zip.zip or whodunit.zip.ZIP.
1
vote
1answer
153 views
problem with my cash file in pset1
its still showing me the same error..
make: *** No rule to make target `cash'. Stop.
0
votes
1answer
202 views
nothing to be done for - error message
I've created a new file called hello3 - using exactly the same code from my previous mario file, however when I go to 'make' it, it produces an error message stating the following: 'nothing to be done ...
0
votes
1answer
110 views
after check50, my speller compilies but i am getting expected code 0,not 139 from big board and frown turns upside down from bench marking
[removed code per academic honesty guidelines]
0
votes
1answer
10 views
Course was archived but granted access. What affect will this have
Let me start by saying that I have been trying for 2 days to find this answer for myself. I started the CS50 course in 2017 and due to medical reasons could not return to the course until last week. ...
0
votes
2answers
144 views
APCS50 Problem: Chill Out can't figure out the problem with my code
I'm new to programming and I'm stuck on this program which converts Celsius to Fahrenheit.
Please help me figure out the problem with my code:
#include <cs50.h>
#include <stdio.h>
#...
0
votes
1answer
8 views
Not valid text in initials more
int main(void)
{
string s = get_string();
if ((s[0] >= 'A' && s[0] <= 'Z') || (s[0] >= 'a' && s[0] <= 'z')) printf("%c", toupper(s[0])); //print first letter in ...
0
votes
1answer
81 views
I can't log in to my CS50 finance page after I register as a user
Whenever I try to log in with a registered user, I get a ValueError: View function did not return a response error. It doesn't make sense because I can see that the users are registered in my database ...
0
votes
1answer
36 views
Ctrl + S returns (i-search)`':
in CS50; when I hit Ctrl+S to Save it returns
(i-search)`':
Same for Ctrl+Shift+S. Same return.
Ctrl + S is working to save other documents on my computer
Thank you
0
votes
1answer
25 views
I have completed all the projects two months ago but no certificate recieved!
I have completed CS50 from 11 September 2017. I still have not received my certificate or any response at all (e.g. my final project did not pass).
What should I do? Is there anyone with the same ...
0
votes
1answer
29 views
Hi, I'm new to coding. Just got the hello world but water is already giving me trouble
This is my code, I know the curly brackets should come before you start coding but it gives the same error 'expected identifier' in every debug I tried. I have seen your other post to others as well ...
0
votes
1answer
90 views
Why is uncompressed bitmap image checked with the condition biCompression != 0?
For week 4 problem set, in line 50 of copy.c there is a conditional statement to check if the image is uncompressed - biCompression != 0. According to the MSDN documentation for bitMapInfoHeader, the ...
0
votes
0answers
18 views
Is my code completely wrong
I am trying to implement crack.py.I haven't done crack.c...I am really confused.Can anyone please kindly explain me what is wrong with my code
import sys
import crypt
def main():
if len(sys.argv)...
0
votes
1answer
63 views
How to store a Reference board of the original values in sudoku.c
i am looking for help on sudoku.c. i need to store the original numbers that come with the board so that the number values can not be changed. i am having trouble figuring out how to store these ...
0
votes
1answer
178 views
Check_flag in sort race
I have a quick question about the check_flag function in sort race. Just looking for a hint or advice to lead me in the right direction. I cant quite figure out how to reference the argv[1] values. I ...
0
votes
1answer
301 views
CS50x Problem set week 0 Objective?
I am from colombia. Sorry If my english is not perfect !! I subscribed to CS50x and just completed the lecture. Now I am ready for problem set 0. The description for problem set is only "program in ...
1
vote
1answer
29 views
Using Stack Exchange
How to type the code (code would come seperately)? Can anybody help me? I am using it about two three weeks, but can not understand ( I also tried to read the instruction but wasn't helpful)
1
vote
0answers
114 views
picatic the puzzle day
Can anybody tell me what the first puzzle is about? What the images show?
Link for the question is
https://medium.com/@cs50/this-was-cs50x-puzzle-day-2016-1b1519b77353
2017 question
0
votes
1answer
23 views
testing linear search
I had got some good advice previously but need just a little more help as really struggling. How do I test my linear search algorithm?
#include <cs50.h>
#include <stdio.h>
/**
* Returns ...
0
votes
1answer
13 views
Function prototype - error
~/workspace/ $ make prototype
clang -fsanitize=integer -fsanitize=undefined -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wshadow prototype.c -lcrypt -lcs50 -lm -o prototype
...
0
votes
1answer
45 views
doesn't passes all test of check50 2016.vigenere vigenere.c
Showing following error
encrypts "world, say hello!" as "xoqmd, rby gflkp!" using "baz" as keyword
\ expected output, but not "ciphertext:xoqmd, szz gflkp!\n"
what should I make change in my ...
0
votes
1answer
20 views
Save function blanked out
OK, thanks - have finally solved it.
For some reason, the font in the code area was set at '1'! The first few lines of the code were not visible. Everything looks good now. Just scared to logout for ...
2
votes
1answer
136 views
Adding CS50.h to MacOS?
I've been trying to import the cs50.h library by all ways to my mac or xcode with no luck, I followed the instructions on https://manual.cs50.net/library/
nothing is working
Do you have any ...
0
votes
2answers
45 views
pset5-speller: dependency issue
Please, I need your help. I have dependency issue with my code. This is check50 response on my code.
I guess the problem is with my load function. After a few tweaks on the code to fix the dependency ...
0
votes
1answer
81 views
How to check curly braces?
When your code gets longer, how do you check your curly braces?
I am writing my first "longer" piece of code (approx 200 lines) and find it difficult to check that I have all my braces closed ...
0
votes
1answer
71 views
using char arrays
if we use
char a[10];
for(int i=0;i<9;i++)
{
a[i]=GetChar();
printf("%c",a[i]);
}
While assigning every char to a char array, should we always leave the last byte in char array for '\0' ...
0
votes
1answer
19 views
Lecture 4 : pointer size question
should the size of int*, double* be the same? (4 or 8?) as the int* just means the data type the pointer points while we are saving the address of a.
int a;
double b;
int is 4 bytes while double is ...
0
votes
0answers
104 views
where is the file imprecision.c located?
i can not find the file imprecision.c. does any one know the location of this file imprecision.c ? or whats the path to run this file from CS50 IDE?
0
votes
2answers
196 views
Could not load dictionary in cs50 pset5
I wrote the load code for pset5 which compiles but when I execute speller.c it says "Could not load dictionary". I have used both my own dictionary text file and the dictionary at home/cs50/pset5/...
0
votes
2answers
297 views
is my implementation to insertion sort correct?
is my implementation to insertion sort correct?
for(int i = 0; i < n; i++)
{
for(int j = i; j > 0; j--)
{
int t;
if(a[j] < a[j - 1])
{
t = a[j - 1]...
0
votes
1answer
41 views
Download lectures?
How do I download the lectures? When I click "Download Video" in Courseware, it plays the video but doesn't download it. I've tried doing this using Safari/OSX10 and Firefox/Windows8.
Thanks very ...
0
votes
1answer
35 views
myspace in study.cs50: How do I walk through the loop correctly?
I've been trying to solve the problems in study.cs50.
I know for myspace I need to loop through the input string and stop at spaces,
before finally stopping at strlen(input string), (and I'm not doing ...
0
votes
0answers
28 views
froshims-1 week8 walkthroughs
I am having an issue with froshims-1 in week8 walkthrough. It seems like the following line of code has no effect at all
<link href= "/css/bootstrap.css" rel="stylesheet"/>
I have pretty much ...
2
votes
1answer
100 views
Is it possible to teach cs50?
I was wondering if it is possible to teach cs50 in my hometown once I have finished the course (which I am about to finish). Are there any restrictions? Do I have to ask permission, if that is the ...
0
votes
1answer
3k views
answer to the quiz question regarding monkey numbers
i tried very hard to answer the question: which number is represented by 2 magos 1 orange 1 banana?
none of the avilable answers seemed right to me.
can someone give me a hint, or explain it to me?
...
0
votes
1answer
57 views
line numbers are missing in PDF printout
Can anyone give me clue(s) to solve a PDF printing of my coding?
PDF print out of my code is in black only, and does not show color words as in gedit. I have lived with this problem so far.
Then only ...
1
vote
2answers
402 views
Why does traceroute's path not make sense and what exactly is nslookup?
traceroute:
When trying to trace route for facebook.com (I am from India), I get below response. Now, as per the lecture, first few IP addresses or router names are the nearest routers to me. But 1st ...
