Hi,
Can someone show me how I can measure the amount of bytes that *ptr points to in the following piece of code? I don't know how to do that.
Thanks for your help.
Code:#include <memory.h> int main(int argc, char *argv[]) { char *ptr; ptr = malloc(3); *ptr = "ab"; return 0; }
You can't do it. And your code is further wrong, because *ptr is char, not char*, so trying to assign const char* to char won't work.
Use strcpy.
You need to manually keep track of your allocation.
Originally Posted by Adak
I would prefer:
Code:#include <stdlib.h> int main(int argc, char *argv[]) { char *ptr; //ptr = malloc(3*sizeof(char)); // doing this ptr points to a constant string in the heap and you have // a memory leak of three bytes. Malloc is useless in that case. // ab string is already allocated in the memory ptr = "ab"; return 0; }
malloc or *ptr = "ab" should be removed from your code.
EDIT: Second here.
Last edited by myle; 05-25-2008 at 01:22 PM.
Ok, thanks for your help guys
In the second case, it should be const char*, because a string literal is const.
http://cpwiki.sourceforge.net/Common...kes_and_errors
