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Results tagged with pset4
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user 12142
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.
0
votes
Accepted
Why can't I compile my code?
Have you ensured title is within the scope of main()? It is quite possible you only have it available within the function that previously declared it.
Update: I recommend you compile and see for your …
- 1,223
1
vote
Pset4 Recover can't find jpg signature
Since your problem is now resolved I'll instead use this answer to explain why what you see happens, and also what memcmp does.
I don't understand why uint8_t works but not int
uint8_t is guarante …
- 1,223
3
votes
Accepted
How do you pass arguments into GDB argv[1] argv[2]?
To run GDB with arguments in the terminal, use the --args parameter.
gdb --args name arg1 arg2 arg3
debug50 (the graphical debugger) is just GDB with a GUI. GDB was originally designed to be run thr …
- 1,223
4
votes
Accepted
pset4 runtime error: unsigned integer overflow
You are subtracting from bi.biWidth on line 125. Since bi.biWidth is an unsigned long, it cannot contain negative values (-1 and so on), instead it's capacity to store positive values is doubled. So b …
- 1,223
0
votes
Accepted
What is peek and how do you use it?
/resize 4 small.bmp student.bmp
~cs50/pset4/resize 4 small.bmp staff.bmp
~cs50/pset4/peek student.bmp staff.bmp
Which should let you compare headers of student.bmp and staff.bmp …
- 1,223
0
votes
1
answer
85
views
PSET 4 recover: segfault when reading buffer
I'm receiving a segfault when reading the first byte (and probably would on the following) of buffer which is a malloced array -- or perhaps not, if unsigned char * doesn't mean what I think it does. …
- 1,223
2
votes
2
answers
178
views
Resize is not passing check50, but still properly scaling larger images
I can get smiley.bmp and large.bmp to scale properly, but not small.bmp, where the former is 3x3 and the latter two are larger (exactly how much larger I don't know) -- so I assume my program only wor …
- 1,223