Questions tagged [pset]
The pset tag has no usage guidance.
73
questions
0
votes
1answer
53 views
PSET 2 Substitution
My question is about a cs50 PSET. The goal is to create some sort of encryption program. From command line arguments there is a key inputted and every key letter should be replaced with the alphabet ...
0
votes
2answers
56 views
Can't write jpegs in recover, segmentation fault
here's the code i wrote:
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
typedef uint8_t BYTE;
//take command line argument from the user for the file name
int main(int ...
0
votes
1answer
342 views
Problem Set 6 - DNA (Using the DictReader function)
Currently my code functions in so far that I get the appropriate results for the maximum STR counts when I pass a certain sequence. However, I have no clue as to what I should do to progress; I tried ...
0
votes
1answer
16 views
CS50 Recover outputs random symbols instead of JPEGS
I am working on pset4 recover in CS50 and I think I am almost done it. The files that it outputs though appear as a bunch of random symbols instead of a jpeg, I'm not sure why this is occurring but ...
0
votes
1answer
138 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 ...
0
votes
0answers
30 views
stuck on pset 8 finance [duplicate]
I have an error in set 8 finance. It says
:( buy handles valid purchase
expected to find "112.00" in page, but it wasn't found
sending POST request to /login
sending POST request to /buy
...
0
votes
0answers
19 views
Why CS50 2019 excluded MashUp problem set?
everyone
I have noticed that staff solution for MashUp problem set is not working correctly , displaying same articles for any location in USA and having waterMark ( "for development purposes only")....
0
votes
1answer
224 views
PSet 2: Caesar, validating key
I'm struggling with the output to the "Validating Caesar's Key" part of PSet 2. First-timer here, like many, and appreciative of any insight. When I compile and then run this program with "./caesar 2",...
0
votes
1answer
37 views
Resize compliling but gives me grey and white blocks lol!
I don't know what went went wrong! I'd understand if it was giving me coloured blocks and it's messed up in some order but it's just white and grey?
#include <stdio.h>
#include <stdlib.h>
...
0
votes
1answer
278 views
Pset 1: Cash help
I've put together my answer for the cash problem set, but when I run the program and enter an amount for "change owed" it always outputs 1. Being new to all of this, I'm not sure what I'm doing wrong ...
0
votes
1answer
31 views
Check50 has Blank Output
I am trying to run check50 on my code, but it does not return anything; the output is blank, and it only returns a link to a check on https://cs50.me.
Anyone know how to fix this problem
0
votes
1answer
73 views
I need help with cash - again
Ok so this is my improved code:
#include <stdio.h>
#include <cs50.h>
#include <math.h>
int main (void)
{
float c;
int a, n=0;
do
{
c = get_float("Change: ");
}
while (...
0
votes
1answer
59 views
CS50 AP: Pennies
I'm wondering why a lot of my answers are off by 0.01 or a very small amount. Here are the results from check50:
:) pennies.c exists
:) pennies.c compiles
:( 28 days, 1 penny on day one yields $...
1
vote
1answer
164 views
This should be right (Caesar)
After spending pretty much a whole day on this, I have gotten it to work fine, it does all that was demanded but when submitted, I am still getting 1/5 on correctness. :( someone tell me if I left ...
0
votes
1answer
31 views
music pset - semantic error
I implemented the music program in pc and I omitted the cs50.h library since I work offline most of the time. Everything's fine actually my code did not give me error messages and it compiled ...
3
votes
2answers
141 views
Which loop can be replaced for nested for loops for PSET 1 (Mario More Comfortable)?
According to the cs50 style guide for C, more than 3 variables for iteration is not a good practice. I have done Pset 1 (Mario more comfortable) with 5 for loops, so it has 5 iterations variables. Is ...
0
votes
1answer
218 views
Submissions via check50 does not appear on cs50.me
I have submitted my problem sets via check50 as instructed, but when I go onto my cs50.me page and check my scores, it says "No Submissions" next to each problem set. I have already linked my edx ...
0
votes
1answer
139 views
Handlebars.compile() not behaving as expected
I am trying to use handlebars.compile() to generate my HTML unordered list items in my getJSON() callback function:
function addMarker(place)
{
...
// add event listener to open info window ...
0
votes
1answer
91 views
pset 4 resize please help
//CREATE A PROGRAM TO RESIZE A BITMAP FILE
//include C libraries
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "bmp.h"
int main(int argc, char* argv[])
{
//...
0
votes
1answer
21 views
Why does the strcmp() give 17 instead of 0 between the second characters of dave and baca
int main(void)
{
int i;
char* kw = get_string(Enter keyword: \n");
char* plntext = get_string(Enter plaintext: \n);
for(i = 0;i < strlen(kw); i++)
{
printf("%s, ", kw[i])...
0
votes
1answer
192 views
pset1 cash.c Do While loop executing even when condition = false?
I am inputting 0.26 into cash.c, and after the first do while loop in my program, f = 0.00999999046
My second do while loop condition is f >= 0.10, yet it is executed even though f is less than that. ...
0
votes
1answer
69 views
CS50 Pset 4/Recover-retains 50 broken JPEGs
My code compiles/executes and retains 50 JPEGs, however, these JPEGs are broken, I have gone through my code many of times, have discarded other versions, I seem to be missing something I can't spot ...
0
votes
1answer
120 views
imprecision problem cs50 greedy
#include < cs50.h >
#include < stdio.h >
int main(void) {
float change;
int quarter = 25;
int dime = 10;
int nickel = 5;
int penny = 1;
int counter = 0;
int c ...
0
votes
1answer
79 views
CS50 is great but I need some help
I like the course, it's for me the best CS course online but I need some resources.
The Psets are getting a little hard to solve.
I need some help with the C language in general to think more ...
0
votes
1answer
31 views
Trying to use functions to modify pset2 Caesar characters, get error: expression result unused for each function
So I'm working on pset2's Caesar and wanted decided it would be better to put the algorithm into functions, with each function operating based on whether a character is uppercase or lowercase. Now ...
0
votes
1answer
3k views
CS50 IDE undefined reference to `get_int'
I've created a new workspace on cloud9, and ran update50 as suggested in the answer to this similar question: Undefined reference to get_int
However, I still receive the exception 'undefined ...
0
votes
1answer
118 views
Pset 3 helpers.c check 50 errors
#include <cs50.h>
#include <stdio.h>
#include "helpers.h"
//TODO binearysearch, om te controlere van de waarde.
bool search(int value, int values[], int n)
{
int left = 0;
int ...
0
votes
1answer
238 views
Blank jpegs pset 4 recover
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <cs50.h>
int main(int argc,char *argv[])
{
if (argc != 2)
{
fprintf(stderr, "usage: ./recover ...
0
votes
1answer
209 views
Unable to submit problem set 0 on edX
When I click the submit link, it takes me to the Week's 0 video short on Scratch. Where I can submit it?
0
votes
1answer
169 views
Pset5: Check returns all as misspelled (trie)
I can't, for the life of me, figure out why my check function doesn't work properly. I have triple-checked my load() every way I know how and believe the data structure is properly setup. Why doesn't ...
0
votes
1answer
76 views
pset2 Caesar, not able to print chypertext text
I'm trying to solve the Caesar problem.
if you look at my code, I tried to iterate through the "plaintext" value with a for loop. My aim was at every alphabetical character to apply the chypher ...
0
votes
1answer
97 views
initialization; condition; update in mario.c less comfortable
I am really having a problem with developing the "initialization; condition; update" part of my for loop in my mario (less comfortable) code
could anyone help me with understanding what to input
0
votes
1answer
50 views
any one having trouble opening Pset links
Have not been able to open any of Pset links, able to watch videos of lectures and shorts!
any thoughts?
Thanks
0
votes
1answer
796 views
pset2//caesar- relational operator result unused error
my code-->
#include<stdio.h>
#include<cs50.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
int main(int argc, string argv[])
{
if(argc!=2)
...
0
votes
1answer
208 views
problem resizing horizontally
I've started out this problem as bad as it gets :( trying very hard to understand bitmab files and how they work (especially padding) for a few days(as I'm not a native English speaker).
now that I ...
1
vote
2answers
1k views
Set foreign key in phpLiteAdmin
Does anyone know how to set a foreign key using the phpLiteAdmin interface? The docs for this application are lacking, and the recommended syntax for adding a column using SQLite does not appear to ...
0
votes
1answer
101 views
Recover is Producing Corrupt JPEGS
Here's my code. I've got print debugging statements in there. The output seems to indicated that everything is going well, but when I open up the files, they are blank. I inspected the JPEGS with ...
0
votes
1answer
113 views
so im working on skittles pset and
skittles.c:6:1: error: expected identifier or '('
{
^
this is my error
and this is my uncleaned up code
#include <stdio.h>
#include <cs50.h>
int main(void);
{
int tries = (0);
int ...
0
votes
1answer
629 views
APCS50 Problem: Fahrenheit
ok so im in CS50AP which means for you who dont know mean im in high school so i could use some help with this
right now my code for fahrenheit is:
#include <cs50.h>
#include <stdio.h>
...
0
votes
2answers
496 views
Questions regarding Pset1 water.c
Hi so I figured out the water.c problem but aside from the requirements, I want the user to input the positive number only (the program will keep asking the user to input "Minutes: " again and again ...
0
votes
1answer
40 views
PSET 2: Nested IF statement
I'm trying to solve Caesar cypher ploblem from the course by using an if statement inside another if statement (Nested IF statement? apologies if I'm using the term incorrectly.)
My draft attempt in ...
1
vote
1answer
307 views
pset4 Resize - Trouble Understanding Padding
I'm having a hard time understanding pset4's resize. Although I understand the theory, it's difficult for me to turn it into a program.
I do understand that the scan line's total width must be a ...
0
votes
1answer
305 views
pset 3 Binary search
I'm stuck on implementing the binary search function in pset3. I am trying to do the recursion method but I am stuck and have been for hours. It seemed easy enough but I am discovering that it's more ...
0
votes
1answer
78 views
How should I connect to the multiple databases?
I am trying to Merge several psets.
But to do that I think I need to have multiple databases.
My dumbest approach to that problem follows like this
in constants.php
define("DATABASE", "pset7");
...
0
votes
1answer
19 views
Returning 2015 student (Starting fresh)
I started cs50 in 2015 on EDX but never really finished it. I would like to start again this year. But not with last year's grades. Is it possible to just resend the psets even though I've already ...
0
votes
1answer
50 views
What's wrong with my pset 3 fifteen.c code?e
having some trouble with pset3 fifteen.c.
Not sure what is wrong.
Watched the walkthrough.
After the greeting message, nothing appears.
Here is pastebin:
http://pastebin.com/Vd48ENBc
Here is ...
0
votes
2answers
2k views
No such file or directory, pset1
I have exercise 1 of pset1 ready to go. However, I seem unable to compile the program. I follow the below steps (in fact, I deleted everything and created it from scratch):
Create New Folder, name it ...
0
votes
1answer
156 views
Need a little help with Recover.c , PSET4
I am having issues with this problem set.
I am unable to recover all 50 pictures, only 49, all of these pictures are not more than a few pixels though. I have seen the whole pictures and there's a ...
0
votes
1answer
90 views
Pset 2 Vigenere -
Pset 2 Vigenere - getting this error -:( encrypts "BaRFoo" as "CaQGon" using "BaZ" as keyword \ expected output, but not "CaQGoh\n" Seems that it only happens when it's an upper case key letter ...
0
votes
1answer
744 views
pset4 - Recover - doesn't pass check50 but works
So, I have finished recover.c (2016 edition) and it recovers all 50 of the jpg-s, and labels tham from 000 to 049.
I have looked at every jpg, and they seem intact, all of them (I opened each of them ...
