C/C++ Programming Help Thread

[SG57]

adrahil - I know it's no where near as optimized as the string.h functions are, and to me, I was converting a larger array of characters into a smaller one with specific start and end elements :-P

[hallo007]

Is there a command that cleans up the directory?
i mean deleten all .O's , .elfs , but dont touch the source

[coolguy5678]

make clean

[hallo007]

oke i made a programm for nothing :P , thnx anyway;)

[Mr305]

Am I doing struct pointers right?

typedef struct {
some vars here;
} sometype;

typedef struct{
sometype something;
} parent;

callingfunc (&someparentstruct.memberstruct);

void somefunc(sometype* *thestruct)
{
*thestruct.membervar = something;
}

That's the best I can explain without actual code.

I would like to directly change a member from some struct directly by using "Passing by reference"

[Archaemic]

thestruct->member = value

[SG57]

or

(*thestruct).member = value

:-P

P.S. Being a general C question, you really should've googled for it before posting here.

[Mr305]

P.S. Being a general C question, you really should've googled for it before posting here.

I always ask instead of google.

[PSPJunkie_]

I always ask instead of google.

Why should we give you an answer if you haven't tried to figure it out on your own first?

[Raphael]

I always ask instead of google.

Which is the reason why a lot of people on internet forums get so easily pissed on questions that get asked.

[Mr305]

Why should we give you an answer if you haven't tried to figure it out on your own first?

Which is the reason why a lot of people on internet forums get so easily pissed on questions that get asked.

Hello... Please, everyone, the doc and everyone.. Think before u type...

I meant ask as www.ASK.COM like www.GOOGLE.com... to all!
I prefer ask.com not google.com, which is a leading web search engine that is reliable and relevant in results.

That is why the text Google and Ask was italicized in the prev post.

[Raphael]

Ok, then that joke went aside of me, because I just don't know ask.com.
Sorry for that, but I wasn't just talking about you, but about the general attitude of people to rather ask questions on a forum than to do some search on their own.

[pspballer07]

Ok, I am trying to use Dev-cpp as my development environment but I'm getting problems. First I get a message saying no GNU Make found and it asks me if I want to use the one in Dev-cpp. Then I go to compile and it says /lib/build.mak no file or directory found. Help?

[hallo007]

that error get you when you dindt install toolchain fine in cygwin

[pspballer07]

I think its because the PSPSDK var has to be set. How do you do that in Dev-cpp?

[radioactive_X]

Ok I'm going nuts here.
Why is this happening?

void escape(char s[], char t[])
{
     char c;
     int i;
     i = 0;

     while((c = t[i]) != '\0'){
              switch (c){
              case '\n':
                   s[i] = '\\';
                   ++i;          //<---- A
                   s[i] = 'n';
                   break;
              case '\t':
                   s[i] = '\\';
                   ++i;          //<---- B
                   s[i] = 't';
                   break;
              default:
                   s[i] = t[i];
                   ++i;
                   break;
              }
     }
     s[i] = '\0';
}

This function is supposed to replace '\n' and '\t' with with just those letters in a string.
So

This is a string
that uses a new row

after the function should be

This is a string \nthat uses a new row

all i get is

This is a string \that uses a new row

When it gets to points A or B it just doesn't increment? It tried ++i, i++, i += 1 and nothing seems to work!

I wasted this entire day trying to figure out whats wrong. Someone please help. I know its something retarded.

TIA

[yaustar]

Break out a debugger on your PC and step through the code. The mistake should jump right out. Better yet, get a pen and paper and manually go through the algorithm yourself line by line taking extra attention on what t[i] is at the beginning of every loop.

There is one large logic flaw with that algorithm, you are trying to put two chars in the place of one which doesn't work with raw arrays. Either use the C string library and the insert function or the C++ string class.

If you stick with the C string method then be careful of over running the buffer.

[radioactive_X]

OMG i'm an idiot. Thank you yaustar. :ROFL:

I'm moving s[i] and t[i] at the same time, so when I try to insert '\\' and 'n' basically I'm jumping over t each time, that would explain the missing letter.
:Argh:

Thank you again, I like answers that make me think.

Spoiler for NEW CODE:

void escape(char s[], char t[])
{
char c;
int i,n;
i = n = 0;

while((c = t[n]) != '\0'){
switch (c){
case '\n':
s[i] = '\\';
s[++i] = 'n';
break;
case '\t':
s[i] = '\\';
s[++i] = 't';
break;
default:
s[i] = t[n];
break;
}
++i;
++n;
}
s[i] = '\0';
}

[Fueler]

I have c++ for dummies 5th edition plus the iso of the cd included with it. But is there more approfounded things for a beginner who wants to learn to program with c++? Is there a software that can allow the user to use immediately what he has learned by that same software through some practice programming. exercices?

[pspballer07]

When u read the book, it tells you that there is a compiler on the CD and that is what you use to compile your exercises.

[JaSo PsP]

Ok, I am trying to use Dev-cpp as my development environment but I'm getting problems. First I get a message saying no GNU Make found and it asks me if I want to use the one in Dev-cpp. Then I go to compile and it says /lib/build.mak no file or directory found. Help?

In the makefile for your project, replace '(PSPSDK)/lib/build.mak' with the entire path, eg. 'C:/cygwin/usr/local/pspdev/psp/sdk/lib/build.mak' Worked for me.

[pspballer07]

I was going to do that but somehow it works now. thanks anyway

[BlackShark]

Ok, then that joke went aside of me, because I just don't know ask.com.

its the Algorithm

[Raphael]

its the Algorithm

Excuse me?

[pspballer07]

lol "chicks with swords"
ask.com......

[PSPJunkie_]

lol "chicks with swords"
ask.com......

How... irrelevant.

[pspballer07]

its the commercial, just a joke

[BlackShark]

Excuse me?

[Slarez00]

Hey.. Im trying to beging learning C++ can any1 tell me were i can get a good compiler? for a beginer? and were to download it from>?

[yaustar]

Don't go out to learn C++ if this is going to be your first programming language. Learn Python instead. It is MUCH easier to learn and less pitfalls in the language then C++. This means you can focus on the generic programming concepts and basics more then worrying about the language syntax. Tutorials can be found here

If you still want to learn C++ first then grab wxDevCpp which is a much more up to date and maintained version of DevCpp. Then get this book: Teach yourself C++ in 21 days. It is one the best beginners books I have seen to date. Do not read the online version that I found (Second edition and lower) since it was written before the C++ standard and therefore teaches 'wrong' C++ code.