Questions tagged [cs50x2017]
The cs50x2017 tag has no usage guidance.
73
questions
3
votes
1
answer
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views
How to get and download edX CS50 verified certificate?
I have completed all psets and final project in 2017 and verified my ID with edX. However, I cannot find where the verified CS50 certificate is. Does anyone have idea?
- 41
2
votes
2
answers
240
views
PSET2, crack.c Did this problem fall out of the sky from week 115? Am I overthinking this?
This is the spec:
Specification
Design and implement a program, crack, that cracks
passwords.
Implement your program in a file called crack.c in a directory called
crack.
Your ...
- 25
2
votes
1
answer
549
views
Pset4 resize/less - rewrite (Hint needed)
I was trying to implement the rewrite method. the code compiles without error but I always get a weird result bitmap.
Here is the code I wrote:
#include <stdio.h>
#include <stdlib.h>
#...
1
vote
1
answer
191
views
New users not being entered into database
I'm trying to code the register function for 2017 pset7.
The proper screen comes up, and the program behaves correctly for missing username, missing password, incorrectly repeated passwords, and ...
- 21
1
vote
1
answer
1k
views
CS50x2017 Pset7 quoted.html Extracting Dict Items in Template?
I have this route in application.py for quote:
@app.route("/quote", methods=["GET", "POST"])
@login_required
def quote():
"""Get stock quote."""
# if user reached route via POST
if ...
- 83
1
vote
0
answers
58
views
CS50 Final Project: Unique URL for each user of my flask app (2 of 2)
I have a pending question here: CS50 Final Project: Unique URL for each user of my flask app (posted two days ago) regarding the implementation of unique URLs. This unanswered question was in fact ...
- 121
0
votes
2
answers
1k
views
any idea how to fix Mario more comfortable problem "expected output"
when I executed i have this error
:) mario.c exists
:) mario.c compiles
:) rejects a height of -1
:) handles a height of 0 correctly
:) handles a height of 1 correctly
*:( handles a height of 2 ...
0
votes
1
answer
12k
views
Pset1 error: expected identifier or '('
I want to create a simple program wherein the user inputs any number but only a postive integer is accepted (like the kind mentioned in the CS50 pset1 water walkthrough video)
Ive been onto this for a ...
- 7
0
votes
1
answer
409
views
Pset 4 : recover
I can't understand why my code is giving segmentation fault. It seems alright to me. Would be great if somebody could point out the error to me.
Tried debug50 but not able to understand what is fault ...
0
votes
1
answer
199
views
Pset8 - mashup (2018 or 2017): Downloading distribution code does not include txt files
I'm having some issues with downloading the distribution code for Pset8 (mashup). I am getting everything except US.txt and readme.txt. I do get the other text file, requirements.txt. Is anyone ...
0
votes
1
answer
431
views
PSET5: Segmentation Fault in Speller
I realise there are probably lots of other errors in my code (which you are welcome to point out...PLEASE) but when I use debug on this code, it shows a segmentation fault when calling the HASH ...
0
votes
2
answers
41
views
Give a Function access to earlier value
If the main block of code gets a value from the user, assigns it to an integer, and then changes that interger's value, is there a way for a function (created outside the main block of code) to access ...
0
votes
1
answer
9k
views
Can someone please tell me how to use help50 in the CS50 IDE terminal window?
I want to understand error my program using help50. I would be very grateful if someone tells me the command for this.
- 312
0
votes
1
answer
27
views
Can anyone explain that attendence algoritm of week 0 lecture?
The week 0 lecture of CS50 edx. I was not able to understand how did we come to 546 student.
0
votes
2
answers
75
views
CS50 Pset7: Final Questions before Wrap-Up
I am finally done with implementing my stock-trading website. Anyhow, I have some last questions before wrapping up and hope that someone can help me out to make sure I understand everything in this ...
- 121
0
votes
3
answers
379
views
Pset1: Water- Infinite Loop
Ive encountered an infinite loop while writing code for the water assignment of pset1
Yeah, I realise Ive made a complete mess.
Now Im lost as to how I should proceed further.
Also I did the same ...
- 7
0
votes
1
answer
144
views
Pset1: ~/workspace/pset1/ not working
Ive gone through a range of questions on stackexchange regarding this problem but nothing seems to solve it.
The problem is that
When i use "~/workspace/ $ make hello" the program is running ...
- 7
0
votes
1
answer
997
views
Pset6 2017 - 'str' object has no attribute 'isaplha' - caesar.py
My code for caesar.py receives errors when it checks if the plaintext is alphabetical, lowercase, or uppercase. The terminal says:
'str' object has no attribute 'isaplha'
Am I using the isalpha ...
- 800
0
votes
1
answer
327
views
Google is not letting me get API key
In pset8, I went to developers.google.com/maps/web as mentioned in the documentation. But google redirected me to developers.google.com/maps/overview. And there is no option to get an API key in the ...
0
votes
1
answer
64
views
Vigenere's bug: applies cipher to spaces (all characters)
I'm working on the Vigenere problem and I've came up with the following code:
for (int i = 0, j= 0, p = strlen(s); i < p; i++, j++)
{
int b= (j % strlen(argv[1]));
if (isupper(s[i]))
{...
0
votes
1
answer
499
views
CS50 2017 crack.c not working properly
Can't understand why my code is not working.
Tried 2 different loops to arrive at the solution but the first one does not arrive at anything and keeps on going:
#include <stdio.h>
//#include &...
0
votes
1
answer
64
views
game of fifteen help
yet again. i started working on the game of fifteen, i got it to work. But i had a lot of struggle with the won function. although it now works, i still don't know why it works. it was pretty much ...
0
votes
1
answer
240
views
cs50 pset 6 greedy
import cs50
def main():
count = 0
while True:
print(" O hai ! How much change is owed ?")
input = cs50.get_float()
if input >= 0:
break
input = ...
- 22
0
votes
1
answer
224
views
CS50 : pset4 resize(less comfortable)
I have worked on the code for 6 hour and finally on checking manually these codes are working fine. I have tried both small and large bmp from 1 to 6. It worked. But same is not working in check50.
...
- 1
0
votes
1
answer
70
views
caesar.c questions
I have, I think, finished caesar.c. However passing it through check50, returns the following.
Yet from what I can see in my code, and when i run my program vs the one in /home/cs50/pset2/caesar.c,...
- 3
0
votes
1
answer
238
views
Caesar PSet2: Check50 deems correct looking outputs incorrect
I'm making my way through Caesar.c in PSet2, and am struggling to overcome all these check50 issues. They look identical to me, but I'm sure I made some sort of mistake. Let me know if seeing some ...
- 3
0
votes
1
answer
51
views
Limits of data type as explained in Week-1
In week-1 of CS50 course to introduction to computer programming, we are explained about the limitations of data types that are used in computers nowadays and how the computation 1/10 to 50 decimal ...
- 3
0
votes
1
answer
8k
views
Jinja template exception: "jinja2.exceptions.TemplateSyntaxError"
I have an exception thrown from a template, which reads like this: "jinja2.exceptions.TemplateSyntaxError: Encountered unknown tag 'holding'. Jinja was looking for the following tags: 'endfor' or '...
- 83
0
votes
1
answer
379
views
How to represent current date and time of purchase in table
I need to know how to represent the date and time of purchase correctly in my table for storing who bought what at what price and when (as per the specs for buy). I tried to use datetime.datetime.now(...
- 83
0
votes
1
answer
509
views
Pset6 2017 application.py Sentiments
I can't tell how to get the correct scores for positive, negative and neutral under the "TODO" in application.py, here:
# TODO
positive, negative, neutral = 0.0, 0.0, 100.0
That isn't all we have ...
- 83
0
votes
1
answer
74
views
Twitter App error on Sentiments
When I tried to add my cellphone number to my Twitter profile (since it seems like it's required to be able to create a Twitter App to use for Sentiments), and I entered the confirmation code they ...
- 83
0
votes
1
answer
444
views
CS50 2017 Vigenere Python "IndexError: list index out of range"
Um, another error, another thread? O.o Well, anyway, here's the code:
import cs50
import sys
if len(sys.argv) == 1 or len(sys.argv) > 2:
print("Usage: python vigenere.py <key>")
...
- 83
0
votes
1
answer
51
views
cs50 general psets question about 2017 version
It seems that cs50 2017 /less and /more comfortable versions of psets are somehow
swapped. I got confused several times during working through psets where I found
less comfortable versions to be ...
- 49
0
votes
2
answers
832
views
PHP removal from CS50
Hello dear CS50 folks,
I was wondering - just out of curiosity - why PHP was removed from CS50 ? And why choose Python instead ?
If someone could give me an elaborate answer, explaining the ...
- 101
0
votes
1
answer
24
views
I can't view any of the CS50x course material. Pls help me
I have completed upto pset2. But after the course upgrade I can neither view the Cs50x 2017 material nor the older CS50x 2016 material. Are they still updating their servers or is the problem here on ...
0
votes
0
answers
37
views
Map not appearing
I implemented the configure() function. It worked for a few days but after that the map did not appear. There is only the search textbox which also doesn't work now. When I check the javascript ...
0
votes
1
answer
320
views
IDE is not letting me hash the password. Should I change th hashing algorithm as it tells me to?
I implemented the register function for pset7. It went to the register page that I had implemented. I gave the required credentials and clicked Register. But instead of registering with the ...
0
votes
1
answer
52
views
Submissions from previous courses
I finished cs50x a few days ago and I would like to get a certificate at edX. However, cs50x2018 has started and my scores from 2017 have disappeared at cs50.me. Is there any way to recover them?
- 3
0
votes
1
answer
206
views
Can I complete CS50 for a verified certificate after 31 Dec via Edx?
I don't know if I can make the CS50 course by 31 Dec. I planned to get a certificate. What would happen if I upgrade the course to get a verified certificate and then not finish it this year, but some ...
- 103
0
votes
1
answer
51
views
Check50 for find-less in ps3 shows me a './sort' error
I implemented the helpers for sort and search. Using basic implementations of quicksort and binarysearch. When I ran check50 cs50/2017/x/find/less there was a weird error for the sorting part:
:) ...
- 103
0
votes
1
answer
86
views
CS50 Pset3 "Fifteen" Works but doesn't pass Check50
My code for pset3 "fifteen" works perfectly when I play it—board sizes fit, goes in descending order, blank space prints as a 0 etc. etc. but for some reason, it won't pass any check50 checks past "...
0
votes
1
answer
289
views
How are script.js and application.py linked?
Question
Why am I able to pipe variables from my database into my script.js file? I was able to pipe in "{{place_name}}, {{admin_name1}}, {{postal_code}}".
script.js
// configure typeahead
$("#...
- 31
0
votes
1
answer
531
views
Pset7 Finance register NameError: name 'pwd_context' is not defined
def register():
session.clear()
if request.method == "POST":
if not request.form.get("username"):
return apology("Missing Username!")
elif not request.form.get("...
- 29
0
votes
0
answers
25
views
Enjoying CS50, asked a question on SO (before I knew about this) and some of the comments have me concerned about CS50 now
Check out the comments in this answer to my question:
https://stackoverflow.com/a/46768605/8561378
What's going on here? How can the reputation of CS50 be bad, or the "first chapters" definitely be ...
- 25
0
votes
1
answer
18
views
I need a hint only!
#include <stdio.h>
int main(void)
{
float no1, no2, result;
printf("Type your 1'st Number: \n");
scanf("%f", &no1);
printf("Type your 2'nd Number: \n");
scanf("%f", &...
- 3
0
votes
1
answer
26
views
Can someone help with what is wrong with this code? Seems something is being overwritten
Firstly, I am getting some valgrind errors. Secondly when I debug the code it seems as if trav gets overwritten. As in, if I am reading caterpillar from the dictionary, it seems to start over again a ...
- 103
0
votes
1
answer
199
views
How can i implement this speller unload function resursively?
I am having problems implementing the unload function in speller. I am trying to do recursion but running into some issues. Here is unload with the function below that I am calling. I am getting the ...
- 103
0
votes
0
answers
133
views
After update50, my texts shown in text editor are still plain white
I am ready to do pset2! However, after I run update50 and close and re-open terminals, I found that my texts in text editor are all white as below:
I found a question asked before here, and I did run ...
0
votes
2
answers
63
views
pset4 recover Segmentation fault
my code can compile but when running it will return Segmentation fault.
And when I apply "echo $?" to the code, it would return 139.
Here is my code.
/**
* Copies a BMP piece by piece, just because.
...
0
votes
1
answer
76
views
CS50 Pset7: Pset7 questions in preparation for final project
I have two questions arising from this problem set which I think can eventually help me with implementing my final project:
Atop every page of the stock trading website, whether it be the LOGIN, ...
- 121