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The Big Programming Thread - Page 591

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 21 2015 14:16 GMT
#11801
im doing this sdl tutorial in C about displaying a img on a window but the compiler is mean to meT_T

does anybody know how I can compile with sdl_image libary? I can't find anything that works
The harder it becomes, the more you should focus on the basics.
Ropid
Profile Joined March 2009
Germany3557 Posts
February 21 2015 14:26 GMT
#11802
What do you type to compile and what's the error message?
"My goal is to replace my soul with coffee and become immortal."
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 21 2015 14:36 GMT
#11803
compile command: gcc newmain.c `pkg-config --cflags --libs sdl2` -lSDL_image

fatal error: SDL_image.h: No such file or directory
The harder it becomes, the more you should focus on the basics.
Ropid
Profile Joined March 2009
Germany3557 Posts
Last Edited: 2015-02-21 14:49:45
February 21 2015 14:45 GMT
#11804
The compiler has a list of directories it looks at for header files that you use like this in your source code:

#include <bla.h>

You can add a directory to the compiler's list through -I. That -ISDL_image means you tell it to search in a sub-directory "SDL_image" from where you are currently.

If you use this in your source code:

#include "bla.h"

That will search for bla.h in the same directory as where your source is.
"My goal is to replace my soul with coffee and become immortal."
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 21 2015 14:48 GMT
#11805
On February 21 2015 23:45 Ropid wrote:
The compiler has a list of directories it looks at for header files that you use like this in your source code:

#include <bla.h>

You can add a directory to the compiler's list through -I. That -ISDL_image means you tell it to search in a sub-directory "SDL_image" from where you are currently.

If you use this in your source code:

#include "bla.h"

That will search for bla.h in the same directory as where your source is.

aaahhh thank you, I geuss I have to search for the libary location then.
The harder it becomes, the more you should focus on the basics.
Ropid
Profile Joined March 2009
Germany3557 Posts
Last Edited: 2015-02-21 14:54:53
February 21 2015 14:49 GMT
#11806
On February 21 2015 23:48 sabas123 wrote:
Show nested quote +
On February 21 2015 23:45 Ropid wrote:
The compiler has a list of directories it looks at for header files that you use like this in your source code:

#include <bla.h>

You can add a directory to the compiler's list through -I. That -ISDL_image means you tell it to search in a sub-directory "SDL_image" from where you are currently.

If you use this in your source code:

#include "bla.h"

That will search for bla.h in the same directory as where your source is.

aaahhh thank you, I geuss I have to search for the libary location then.

I just tried that pkg-config you use on my machine here and it looks like this:

$ pkg-config --cflags --libs sdl2
-D_REENTRANT -I/usr/include/SDL2 -lSDL2 -lpthread

That seems to list everything that should be needed for me. What's happening for you? How does the output look like?

EDIT: But I just found out, if you're after SDL_image.h, that one is in another directory as it's SDL and not SDL2, so the options for it get found through:

$ pkg-config --cflags --libs sdl
-D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/SDL -lSDL -lpthread

I see there's also another sdl2_image package on my Linux distro, not just sdl_image. Both have a SDL_image.h file in them. Perhaps you installed the wrong package?
"My goal is to replace my soul with coffee and become immortal."
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 21 2015 14:57 GMT
#11807
I found the error.

I had libsdl1.2-image-dev and libsdl2-image but not libsdl2-image-dev

that took me 2 hoursT_T
The harder it becomes, the more you should focus on the basics.
nunez
Profile Blog Joined February 2011
Norway4003 Posts
February 21 2015 15:35 GMT
#11808
noob!
conspired against by a confederacy of dunces.
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 21 2015 16:11 GMT
#11809
On February 22 2015 00:35 nunez wrote:
noob!

+ Show Spoiler +
[image loading]
The harder it becomes, the more you should focus on the basics.
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 21 2015 20:11 GMT
#11810
trying to understand mergesort made me realize somethings are still confusing as hell T_T

+ Show Spoiler +
void merge(int *arr, int size1, int size2) {
int temp[size1+size2];
int ptr1=0, ptr2=0;

while (ptr1+ptr2 < size1+size2) {
if (ptr1 < size1 && arr[ptr1] <= arr[size1+ptr2] || ptr1 < size1 && ptr2 >= size2)
temp[ptr1+ptr2] = arr[ptr1++];

if (ptr2 < size2 && arr[size1+ptr2] < arr[ptr1] || ptr2 < size2 && ptr1 >= size1)
temp[ptr1+ptr2] = arr[size1+ptr2++];
}

for (int i=0; i < size1+size2; i++)
arr[i] = temp[i];
}

void mergeSort(int *arr, int size) {
if (size == 1)
return;

int size1 = size/2, size2 = size-size1;
mergeSort(arr, size1);
mergeSort(arr+size1, size2);
merge(arr, size1, size2);
}

The harder it becomes, the more you should focus on the basics.
Azerbaijan
Profile Blog Joined January 2010
United States660 Posts
February 22 2015 09:49 GMT
#11811
Any erlang programmers here? I am considering using erlang for my university capstone project and am not sure what I am thinking of doing is feasible.
Cynry
Profile Blog Joined August 2010
810 Posts
February 22 2015 09:58 GMT
#11812
On February 22 2015 05:11 sabas123 wrote:
trying to understand mergesort made me realize somethings are still confusing as hell T_T

+ Show Spoiler +
void merge(int *arr, int size1, int size2) {
int temp[size1+size2];
int ptr1=0, ptr2=0;

while (ptr1+ptr2 < size1+size2) {
if (ptr1 < size1 && arr[ptr1] <= arr[size1+ptr2] || ptr1 < size1 && ptr2 >= size2)
temp[ptr1+ptr2] = arr[ptr1++];

if (ptr2 < size2 && arr[size1+ptr2] < arr[ptr1] || ptr2 < size2 && ptr1 >= size1)
temp[ptr1+ptr2] = arr[size1+ptr2++];
}

for (int i=0; i < size1+size2; i++)
arr[i] = temp[i];
}

void mergeSort(int *arr, int size) {
if (size == 1)
return;

int size1 = size/2, size2 = size-size1;
mergeSort(arr, size1);
mergeSort(arr+size1, size2);
merge(arr, size1, size2);
}


What's your issue with this one ? Recursivity ?
Blisse
Profile Blog Joined July 2010
Canada3710 Posts
Last Edited: 2015-02-22 10:44:05
February 22 2015 10:26 GMT
#11813
On February 22 2015 05:11 sabas123 wrote:
trying to understand mergesort made me realize somethings are still confusing as hell T_T

+ Show Spoiler +
void merge(int *arr, int size1, int size2) {
int temp[size1+size2];
int ptr1=0, ptr2=0;

while (ptr1+ptr2 < size1+size2) {
if (ptr1 < size1 && arr[ptr1] <= arr[size1+ptr2] || ptr1 < size1 && ptr2 >= size2)
temp[ptr1+ptr2] = arr[ptr1++];

if (ptr2 < size2 && arr[size1+ptr2] < arr[ptr1] || ptr2 < size2 && ptr1 >= size1)
temp[ptr1+ptr2] = arr[size1+ptr2++];
}

for (int i=0; i < size1+size2; i++)
arr[i] = temp[i];
}

void mergeSort(int *arr, int size) {
if (size == 1)
return;

int size1 = size/2, size2 = size-size1;
mergeSort(arr, size1);
mergeSort(arr+size1, size2);
merge(arr, size1, size2);
}



does your code work? what's with the ptr1 >= size1, that will never happen
There is no one like you in the universe.
spinesheath
Profile Blog Joined June 2009
Germany8679 Posts
Last Edited: 2015-02-22 12:58:16
February 22 2015 10:55 GMT
#11814
Don't call stuff "ptr". What's that? "pointer", "peter", "pastor", "petrol"? Give your variables proper names. It's not even a pointer to begin with.
Don't do stuff like arr[size1+ptr2++]. What's even worse: temp[ptr1+ptr2] = arr[size1+ptr2++]. What's evaluated first, the left side array index or the right side postfix increment? Sure, it's properly defined, but that doesn't make it a good idea to write stuff like that.

I'd assume you'd be less confused if you didn't try to be so fancy.
If you have a good reason to disagree with the above, please tell me. Thank you.
Blisse
Profile Blog Joined July 2010
Canada3710 Posts
Last Edited: 2015-02-23 07:10:58
February 22 2015 12:52 GMT
#11815
reformatted your code to how i would write it (kinda)

really just need to clean up the code and it should be a lot easier to read through

+ Show Spoiler +

void merge(int* outArray, int aSize, int bSize) 
{
int outArraySize = aSize + bSize;
int tempArray[outArraySize];
int aIndex = 0;
int bIndex = 0;

while (aIndex + bIndex < outArraySize)
{
if (aIndex < aSize)
{
if ((outArray[aIndex] <= outArray[aSize+bIndex]) || (bIndex == bSize))
{
tempArray[aIndex + bIndex] = outArray[aIndex];
aIndex += 1;
}
}

if (bIndex < bSize)
{
if ((outArray[aIndex] > outArray[aSize + bIndex]) || (aIndex == aSize))
{
tempArray[aIndex + bIndex] = outArray[aSize + bIndex];
bIndex += 1;
}
}
}

for (int i = 0; i < outArraySize; ++i)
{
outArray[i] = tempArray[i];
}
}

void mergeSort(int* array, int size)
{
if (size == 1)
{
return;
}

int size1 = size/2;
int size2 = (size/2) + 1;
mergeSort(array, size1);
mergeSort(array+size1, size2);
merge(array, size1, size2);
}


There is no one like you in the universe.
spinesheath
Profile Blog Joined June 2009
Germany8679 Posts
Last Edited: 2015-02-22 12:57:48
February 22 2015 12:56 GMT
#11816
Duh, you already fixed it. Now I have nothing to say here.
If you have a good reason to disagree with the above, please tell me. Thank you.
Blisse
Profile Blog Joined July 2010
Canada3710 Posts
Last Edited: 2015-02-22 13:02:01
February 22 2015 12:58 GMT
#11817
On February 22 2015 21:56 spinesheath wrote:
Duh, you already fixed it. Now I have nothing to say here.


:p


we should have like a "critique my code" thingie every once in a while
There is no one like you in the universe.
sabas123
Profile Blog Joined December 2010
Netherlands3122 Posts
February 22 2015 14:14 GMT
#11818
On February 22 2015 21:58 Blisse wrote:
Show nested quote +
On February 22 2015 21:56 spinesheath wrote:
Duh, you already fixed it. Now I have nothing to say here.


:p


we should have like a "critique my code" thingie every once in a while

ye that is a really good idea.

the code I posted was a tutorial i got somewhere because I got to frustated after my own code not working after like 10 times lol.

the part that confuses me about that program is when the merge is called. this is how i under stand it

you give mergsort an array, -> it splits it and calls its self to infinty till there are only 2 in the array left - > starts merging.
but wont it will just a unsorted array for each time it called itself, and when it is sorted it has only 2 numbers to merge.
The harder it becomes, the more you should focus on the basics.
nunez
Profile Blog Joined February 2011
Norway4003 Posts
Last Edited: 2015-02-22 15:00:16
February 22 2015 14:43 GMT
#11819
On February 22 2015 19:55 spinesheath wrote:
Don't call stuff "ptr". What's that? "pointer", "peter", "pastor", "petrol"? Give your variables proper names. It's not even a pointer to begin with.
Don't do stuff like arr[size1+ptr2++]. What's even worse: temp[ptr1+ptr2] = arr[size1+ptr2++]. What's evaluated first, the left side array index or the right side postfix increment? Sure, it's properly defined, but that doesn't make it a good idea to write stuff like that.

I'd assume you'd be less confused if you didn't try to be so fancy.


i'd prefer ptr (pronouned: ptr) to pointer if you are writing c++, it conforms to the standard and is terser.
std::unique_ptr, std::shared_ptr, std::weak_ptr, etc...

your other point is good and is worth a peep. this point is valid only as it pertains to evaluation order, and not precedence, or expressions in general. i avoid it myself, i am not familiar enough to resolve ambiguities for now.

@ropid
i get that partiucal kind of programming pleasure from only using
#include<...>, so i always do -I./ in my projects.
conspired against by a confederacy of dunces.
Ropid
Profile Joined March 2009
Germany3557 Posts
February 22 2015 17:52 GMT
#11820
On February 22 2015 23:14 sabas123 wrote:
Show nested quote +
On February 22 2015 21:58 Blisse wrote:
On February 22 2015 21:56 spinesheath wrote:
Duh, you already fixed it. Now I have nothing to say here.


:p


we should have like a "critique my code" thingie every once in a while

ye that is a really good idea.

the code I posted was a tutorial i got somewhere because I got to frustated after my own code not working after like 10 times lol.

the part that confuses me about that program is when the merge is called. this is how i under stand it

you give mergsort an array, -> it splits it and calls its self to infinty till there are only 2 in the array left - > starts merging.
but wont it will just a unsorted array for each time it called itself, and when it is sorted it has only 2 numbers to merge.

You could think of it as some sort of math.

Look at this:

sort FHDCEAGB
= merge (sort FHDC) (sort EAGB)
= merge (merge (sort FH) (sort DC)) (sort EAGB)
= merge (merge (merge (sort F) (sort H)) (sort DC)) (sort EAGB)
= merge (merge (merge F H) (sort DC)) (sort EAGB)
= merge (merge FH (sort DC)) (sort EAGB)
= merge (merge FH (merge (sort D) (sort C))) (sort EAGB)
= merge (merge FH (merge D C)) (sort EAGB)
= merge (merge FH CD) (sort EAGB)
= merge CDFH (sort EAGB)
= merge CDFH (merge (sort EA) (sort GB))
= merge CDFH (merge (merge (sort E) (sort A)) (sort GB))
= merge CDFH (merge (merge E A) (sort GB))
= merge CDFH (merge AE (sort GB))
= merge CDFH (merge AE (merge (sort G) (sort B)))
= merge CDFH (merge AE (merge G B))
= merge CDFH (merge AE BG)
= merge CDFH ABEG
= ABCDEFGH

I regret starting with 8 elements and not just 4. T_T

An alternative is thinking about it visually as some sort of tree graph that gets built up by the sort function and collapsed by the merge function. You could draw that on paper or something.

You could also think about what's happening on the stack. That's what helped me with recursion. The local variables of functions are living inside layers on the stack. Each function call adds a new layer on top, returning from a function deletes that layer. Parameters are the same as variables (and you can btw. even use them and overwrite them in C).
"My goal is to replace my soul with coffee and become immortal."
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