legOS : 3744


Robotics / RCX / legOS / 3744	3743 \| 3745

Subject:	Re: problems with creating arrays of larger sizes
Newsgroups:	lugnet.robotics.rcx.legos
Date:	Mon, 17 May 2004 14:47:13 GMT
Viewed:	4999 times

Andreas Jurk wrote: > OK, here is my code. > int main() > { > int i; > char c[n]; > > for(i=0;i<n;i++) > { > *(c+i)=0; > } > return 0; > } This won't work for sure. If you look into the kernel sources, DEFAULT_STACK_SIZE gives the value for every user program's stack. Actually, this is 1KByte, if I remeber it right. Your character array will be allocated on the stack and so you will get a silent stack overflow and your program might crash (or worse, it will run and you get strange effects). If you use malloc / free for dynamic memory management, you can allocate all memory you want and check for correct allocation before you try to use it. Regards, Michael

Message has 1 Reply:

		RE: problems with creating arrays of larger sizes
(...) Need to understand the difference how array and pointers are being allocated ... And char is usually one or two bytes, depending on type of procesor; and pointer is usually 4 bytes, unless you go to 64-bit processor ... If you wish to utilize (...) (20 years ago, 18-May-04, to lugnet.robotics.rcx.legos)

Message is in Reply To:

		Re: problems with creating arrays of larger sizes
OK, here is my code. #include <dmotor.h> #include <dsensor.h> #include <unistd.h> #include <dbutton.h> #include <conio.h> #include <stdio.h> #define n 1000 void verzoegerung(unsigned long zeit) { while(zeit--); } int main() { int i; char c[n]; (...) (20 years ago, 17-May-04, to lugnet.robotics.rcx.legos)

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