I have this function:
If I do the following, I get no compilation warnings, but I get a seg faultCode:void func(unsigned *t) { //do something with t }
If I do this, I get one seg fault(incompatible pointer type), but it behaves how I want it to.Code:unsigned *temp; func(temp);
How can I get it working but without the warning?Code:unsigned *temp; func(&temp);
thx
Note that type* is just a pointer. It points to some memory location where the value is stored. But since you don't initialize the variable with valid allocated memory, you get a seg fault, a crash.Code:void func(unsigned int* t) { //do something with t } unsigned int temp; func(&temp);
Note that a pointer is created by taking the address of a variable or by allocating dynamic memory (ie malloc). If you take the address of a pointer, you get a pointer-to-pointer.
So...
And you actually get an error, not a warning because the standard doesn't allow converting from type** to type* (and it won't work to boot!).Code:int x; int* y = &x; int** z = &y;
Keep that in mind.
Last edited by Elysia; 01-24-2008 at 02:54 PM.
Originally Posted by Adak
I tried the above but I'm still getting the same warning
Last edited by Wiretron; 01-24-2008 at 02:58 PM.
Then you didn't try the above. Post what you have and what error/warning you're getting.
passing argument 1 of func from incompatible pointer type
Code, please.
You cannot get that error from the code above:
What code do you have, and why isn't it what's above?Code:void func(unsigned int* t) { //do something with t } unsigned int temp; func(&temp);
nvm, all sorted!
thx
Last edited by Wiretron; 01-24-2008 at 03:10 PM.
try a
#include <stdio.h>
at the top of your program.
printf is declared in stdio.h. So you need to include that header.
Try this:
--Code:unsigned *temp; /* equivalent to unsigned int *temp */ unsigned ui; function(&ui); /* Call funciton() like this */
Vijay Zanvar
http://faq.zanvar.in
The temp variable is unreferenced so you don't need it.
It's always best to explicitly specify a type. So not "unsigned temp", but "unsigned int temp".
