Questions tagged [error]
The error tag has no usage guidance.
272
questions
0
votes
0
answers
51
views
parse error: no such table
I'm currently on week 1 of cs50's SQL course, running into some issues with the exercise.
Running the code from both the file and the terminal results in a no such table, despite me already ...
0
votes
1
answer
31
views
Problem with my code (Problem Set 1 - Credit)
#include <cs50.h>
#include <stdio.h>
int checksum(long n);
int main(void)
{
long card_number;
int k;
// Prompt user for card number
do
{
card_number = ...
0
votes
2
answers
48
views
Stuck on Lab 1 #CS50
I'd appreciate your help as I'm stuck on the last part of Lab 1.
#include <cs50.h>
#include <stdio.h>
int main(void)
{
// TODO: Prompt for start size
int start;
do
{
...
- 1
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
18
views
My floating point value won't return the decimal point
#include <cs50.h>
#include <ctype.h>
#include <stdio.h>
float calc_hours(int hours[], int weeks, char output);
int main(void)
{
int weeks = get_int("Number ...
- 35
0
votes
1
answer
14
views
Getting "error: expected identifier or '('" error and I don't know why
char rotate(char c, int n);
{
int upper[] = {65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90};
int lower[] = {97, 98, 99, 100, 101, 102, 103, 104,...
- 35
1
vote
1
answer
364
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
154
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
17
views
Getting error expected ')' and I don't know why
if ((word{i} >= 'a' && word{i} <= 'z') || (word{i} >= 'A' && word{i} <= 'Z'))
{
while (points{j} < word{i})
{
j++;
}
...
- 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
0
answers
10
views
Hi, i was trying to add cs50 library, when i go inside the tests folder and i try to make it, it gives me an error, i don't know what to do here
can anybody help me? I've been trying to add the library for two days, and I also want to add the other libraries to be able to do the problems without wifi
0
votes
0
answers
91
views
Pset9 Check50: buy handles valid purchase
I'm almost done with Finance but my solution doesn't pass the last tests of Check50. I'm stuck on the buy function. Check50 outputs the following: "buy handles valid purchase expected to find &...
- 1
0
votes
1
answer
16
views
How do I combine variables and words in a sentance?
printf("%i\n", quarters, "quarters,", "%i\n", dimes, "dimes,", "%i\n", nickels, "nickels", "%i\n", pennies, "pennies.");...
- 35
0
votes
1
answer
112
views
Getting: expected identifier or '(' error and I don't know why
int calculate_quarters(int cents);
{
// TODO
int quarters;
for(quarters = 0; cents >= quarters; quarters++)
{
cents = cents - 25;
}
return quarters;
}
The error happens ...
- 35
0
votes
0
answers
162
views
Pset 9 Finance 'TypeError: 'NoneType' object is not subscriptable'
I'm currently doing Finance, for CS50x 2023, but I keep getting the same 'nonetype' object is not subscriptable error. I have tried to debug the error and found out that it is the user_id variable ...
- 1
0
votes
1
answer
37
views
there is a logical error I can't really catch up with
Output:
Results for cs50/problems/2022/x/credit generated by check50 v3.3.7
:) credit.c exists
:) credit.c compiles
:) identifies 378282246310005 as AMEX
:) identifies 371449635398431 as AMEX
:) ...
0
votes
1
answer
362
views
PSET 9 Finance Index Function (jinja2.exceptions.UndefinedError: 'row' is undefined)
I have tried using dot notation in the index.html for loop. I referred to Lab 9 to check my syntax and ensure that I am passing variables correctly from app.py. I have also used flash(stock_rows[0][&...
0
votes
2
answers
238
views
cs50 error - Linker command failed with Exit code 1
I've been trying to do one of the sample programs in lecture 1 and keep being prompted with the same error. However, when running a simple "Hello, world" program it executes fine. I've ...
0
votes
0
answers
20
views
My codespace updated, now I cant compile my mario.c program to continue where I left off. Details below. Any help appreciated
I was away for a month and just opened up my codespace to finish my mario.c problem set.
I had got the columns printing etc but still lots to do.
I had to update my codespace, and "rebuild"
...
- 1
0
votes
0
answers
548
views
Invalid operands to binary expression ('std::string' (aka 'basic_string<char>') and 'char')
int main(){
int t;
cin>>t;
while(t--){
int n,sum=0;
cin>>n;
string s[n];
for(int i=0;i<n;i++)
cin>>s[i];
int dec_value = 0;
// Initializing base value to 1, i.e 2^0
...
0
votes
1
answer
14
views
cs50 make mario Hello I'm new to cs50 course when doing make mario i got this error
#include <cs50.h>
#include <stdio.h>
int main(void)
{
int n;
do
{
n = get_int("Width: ");
}
While (n < 1);
for (int i = 0; i < 4; i++)
...
0
votes
0
answers
55
views
CS50-C compiler doesn't working
I can't run the code on cs50 C section is there something wrong with my compiler
0
votes
1
answer
11
views
Idk why this error is coming can anyone help
Link to problem: https://leetcode.com/problems/shifting-letters/#:~:text=Shifting%20Letters%20%2D%20LeetCode&text=You%20are%20given%20a%20string,z')%20%3D%20'a'%20.
string shiftingLetters(string ...
0
votes
0
answers
84
views
HELP, error on VS Code, new programmer, CONTAINER ERROR
I'm in the middle of finalizing pset4/filter-more.
Just last night I got the error that you can see in the image attached.
What could be the cause? A virus?
I'm new to programming and really don't ...
0
votes
1
answer
74
views
PSET 2 Readability: undefined reference to `count_letters'
I'm receiving the error:
/usr/bin/ld: /tmp/readability-1786f7.o: in function main': /workspaces/109105972/readability/readability.c:19: undefined reference to count_letters'
clang: error: linker ...
0
votes
1
answer
41
views
Error when calling seconnd function - expected expression
I'm trying to call my encryption function and am getting an undeclared identifier error. Not sure where i'm going wrong.
Code:
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
...
- 1
0
votes
1
answer
534
views
CS 50 Pset 1 cash: non-void function does not return a value
I have finish a program and it can run smoothly on other platform like replit... But one I run it on vs code it shows the following error and it also have something weird happen when I run check 50 ...
1
vote
1
answer
506
views
CS50P - Error in pset2 (Coke)
In pset2 (Loops), 2nd problem ("Coke"),
I believe there's an error in the 4th test that check50 performs: it requires an output of $0.50 after the user entered $0.30. The full price is $0.50,...
- 11
1
vote
1
answer
289
views
VS code malfunction
On this morning when I open my vs code I found this suddenly pop out. I ignore it and start coding. Afterward I found that I can save my codes, so I code it in notepad and I save it to vs code using ...
0
votes
1
answer
333
views
Lab 3 error message: Incorrect assignment of sorts
When I try to submit my answers I get these messages on running check50:
:) answers.txt
:) answers all questions
:( correctly identifies each sort
Incorrect assignment of sorts.
I'm not sure I'm ...
0
votes
2
answers
269
views
defining a char variable, why am i getting this error?
#include <cs50.h>
#include <stdio.h>
int main(void)
{
int height;
do
{
height = get_int("height: ");
} while (height < 1 || height> 8);
const ...
1
vote
2
answers
64
views
PSet1 - Coins issue
While doing the Coins problem set, I am receiving an error while trying to compile and I can't figure out what the issue is.
"cash.c:53:27: error: variable 'cents' used in loop condition modified ...
- 11
1
vote
1
answer
330
views
Compiling Error: Make function not working
I'm just starting out, using VS code as my IDE. Here is my code
#include <stdio.h>
//here were are setting up a function
//meow(void) means it takes no arguments
//void at the beginning is ...
- 13
0
votes
0
answers
1k
views
0
votes
1
answer
547
views
Tideman - "lock_pairs skips final pair if it creates cycle" - Almost there!
Getting good results in test cases. Hoping someone can point out where I'm going wrong! I'm also open to general code comments.
// Lock pairs into the candidate graph in order, without creating cycles
...
- 11
0
votes
1
answer
23
views
Pset0 - error & fatal error
How can I resolve this problem? Is it a library problems?Is there any mistake in setting?
Appreciate before hand!
https://i.stack.imgur.com/NVXxo.png
- 1
0
votes
0
answers
89
views
pset1 Mario error: expected identifier
I really tried to find the solution for myself, but after a lot of hours I give up. Here is the error message and code if its possible please help me:)
#include <cs50.h>
#include <stdio.h&...
2
votes
1
answer
2k
views
Can't run debugger
I'm trying to run the debugger, by typing into the terminal:
debug50 ./filename
But unfortunately an error comes up in the terminal, saying:
Failed to connect extension server on port None.
Please ...
0
votes
1
answer
19
views
How can i fix it
Whenever I press the keyboard, this error report always pops up, how can I solve it？
I have tried restarting the IDE, but it doesn't seem to work
-1
votes
1
answer
120
views
PSET4 - Filter(more)- Edges- Check50 error
#include"helpers.h"
#include <math.h>
int check_cap(int num);
void edges(int height, int width, RGBTRIPLE image[height][width])
{
RGBTRIPLE image_copy[...
0
votes
2
answers
110
views
PSET6 Readability "unsupported operand type(s) for *: 'float' and 'NoneType'"
I'm getting "unsupported operand type(s) for *: 'float' and 'NoneType'" error for line 34: "s = (100 / words) * sentences".
Not sure what to make of this since count_sentences(text)...
- 53
0
votes
1
answer
35
views
What`s my code not work?
The code is
#include <stdio.h>
int main(void)
{
printf("hello, world");
}
but when i execute ./hello.c the result is
~/ $ ./hello.c
./hello.c: line 3: syntax error near ...
0
votes
1
answer
123
views
Mario.c:19:36: error: use of undeclared identifier 'row'
I am not sure what I am doing wrong...
I made 16 same errors of different identifiers but I am not sure why
0
votes
1
answer
43
views
Why is it asking me to declare (s) when is has been declared already?
#include <stdio.h>
#include <cs50.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
bool is_valid_key(string s);
int main(int argc, string argv[])
{
if (...
- 3
0
votes
1
answer
55
views
PSET5 Why Speller can't load dictionary? (included HASH function in case it's relevant)
// Load function
bool load(const char *dictionary)
{
char word[LENGTH + 1];
FILE *file = fopen("dictionary", "r");
if (file == NULL)
{
printf(&...
- 53
0
votes
0
answers
2k
views
Invalid slug error
When trying to go through the steps in lab 1 for hello.c. I am getting the below error
~/ $ check50 cs50/problems/2021/pset1/hello ...
0
votes
1
answer
244
views
pset9: finance // jinja syntax error in index
I'm working on my index page and I have two errors. For the first, I'm not sure what's wrong. It seems like it's something with my return statement but I have no idea what's wrong with it.
File "...
- 3
0
votes
1
answer
305
views
error : function definition not allowed here pls help
i got this error message
pls help
$ make triangle
clang -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wno-unused-parameter -Wno-unused-variable -Wshadow triangle.c -lcrypt -lcs50 -...
- 1
0
votes
1
answer
384
views
debug50 error in online IDE: 'MODULE_NOT_FOUND'
While working on pset3 tideman problem, I attempted to use the debugger and got this error in return. the debugger opens and then closes immediately, and generates the below text. How can i resolve ...
- 11