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Results tagged with pset4
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user 12172
The standard edition of Problem Set 4 will move beyond C programming language basics, testing your knowledge of pointers, memory management, file i/o and structs.
2
votes
Pset 4: Whodunit Red to white
I'm not going to spoil the answer for you, but I'll share the line of reasoning that helped me to "get the red out" of the image.
Think about this. The hexadecimal RGB representation of black is #000 …
- 3,050
1
vote
Pset4 Whodunit: The person is still unrecognisible
Congratulations on "getting the red out" of the image. Now, if you'd like to view the image in 256 shades of gray instead of in pale cyan, you might want to consider what W3Schools has to say about He …
- 3,050
1
vote
Accepted
Pset4 Question 0
You are basically correct:
BMP supports up to 24-bit (16 million colors) and 256 shades of gray.
GIF supports up to 8-bit (256 colors) and 256 shades of gray.
JPEG supports 24-bit (16 million colors) …
- 3,050
1
vote
Which colours do I manipulate in whodunit pset4?
Google "hexadecimal grayscale values" -- w3schools.com will have the best tip of all, if you think about it for a minute.
EDIT: Hexadecimal Colors: Shades of Gray
It might seem counter-intuitive, bu …
- 3,050
0
votes
Accepted
My program says that "No rule to make target `recover'. Stop."
That's a compiler error, not a code error per se.
Make certain that your source code is called recover.c and the source file is in the same current working directory that you are executing the make r …
- 3,050
0
votes
Accepted
How do I copy the file small.bmp from my workspace into the ~cs50/pset4 workspace so I can u...
If you are comparing two files in your current working directory, the usage is:
~cs50/pset4/peek foo.bmp bar.bmp
where foo.bmp and bar.bmp are files in the current working directory. … This is another way of saying:
/home/cs50/pset4/peek /home/ubuntu/workspace/pset4/bmp/foo.bmp /home/ubuntu/workspace/pset4/bmp/bar.bmp
Every command that you execute has a full pathname leading to the …
- 3,050
2
votes
Accepted
1
vote
pset4 debugger stopping
If you are having problems with the graphical debugger in the CS50 IDE (as I did!) then you should learn to use GDB from the command line, as others have suggested. There are two reasons to do this: i …
- 3,050
1
vote
Accepted
Pset4 recover: can't seem to use struct to identify the jpg
You're overthinking this. A struct is not necessary here. Why not try storing your identifiers in an array instead?
- 3,050
3
votes
Accepted
Pset4 recover, comparing hex in if statements
@Blauelf is correct: you can't count on char to be an unsigned 8-bit int.
However, you can use a typedef to make certain that a BYTE is really a byte.
Look at these type definitions, borrowed from b …
- 3,050
1
vote
Accepted
Pset4 recover.c compiles, but can't seem to print Jpgs at all
Just to be crystal clear:
if (data[3] != 0xe0 || data[3] != 0xe0 || data[3] != 0xe1 || data[3] != 0xe2 || data[3] != 0xe3 || data[3] != 0xe4 || data[3] != 0xe5 || data[3] != 0xe6 || data[3] != 0xe7 | …
- 3,050