6
votes
Understanding how memory is allocated in driver code PSET 4, Filter (Less Comfortable)?
RGBTRIPLE(*image)[width] means variable image is a pointer to an array of length width of RGBTRIPLE.
RGBTRIPLE *image[width] means variable image is an array of width pointers to RGBTRIPLE.
The ...
- 21k
3
votes
Accepted
Why can't I print the entire string from the read file?
I guess you meant print(dna[i:i+len("AGATC")]). In Python, if the end of the substring is before the beginning, the substring is empty, so you are printing a bunch of empty strings.
- 21k
3
votes
Accepted
python invalid syntax end=""
I added a space in there and it took the flag away. The rest of the print lines without the space are not flag. I'm wondering if this is a bug with the IDE or am I not understanding something?
This ...
- 41
2
votes
Understanding how memory is allocated in driver code PSET 4, Filter (Less Comfortable)?
What are the parentheses doing?
As Blauelf explained, they are changing order of operations. I didn't full grasp why this was needed though until trying to compile without them.
filter.c:78:15: ...
- 81
2
votes
1
vote
Accepted
Pset4 filter-less -- "function definition is not allowed here"
It's a simple error, there's a missing closing curly brace before the start of the minimum() function.
This is commonly the problem when you get this error. It's telling you that you can't define a ...
- 69.3k
1
vote
Why is my code not compiling (simple get_int example)?
So in fact you didn't copy his code, you tried retyping it and made errors in the translation.
Let's straighten up some terminology:
parenthesis = ( and )
braces = { and }
brackets = [ and ]
For ...
- 1,681
1
vote
Could someone explain to me how curly braces work?
Curly braces help define scopes (range of allowed operation) for variables and statements in C and some other languages.
They also help in defining coding styles. The CS50 course uses a particular ...
- 11
1
vote
Syntax Highlighting Error
Just a guess, did you open a new file that has yet to be named or saved?
Assuming you're in the CS50 IDE, are you writing your code in a file with the .c extension? The IDE has to see that extension ...
- 69.3k
1
vote
Accepted
cs50 pset7 buy syntax error
I would expect you to have an autoincrementing id field that is the primary key (so each transaction has an id) and then a user_id field that holds the user_id for the transaction (that is not unique)....
- 18.7k
1
vote
Accepted
PSET 6: Caesar.py - stuck on "SyntaxError: invalid syntax"
It is as easy as replacing else with elif, in python a condition is not allowed after an else, remember that else is executed if the if condition is not fulfilled, if we want to impose a new condition ...
- 5,179
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