Quick Realloc question

Code:

---

strucType makeBigger(structType  x, char ch)
{ /* Struct x was previous malloc to 8 bits*/
  x = realloc(x, 100);
  printf("%d", sizeof(x));
}

---

So this should print out 100, but it keeps printing out 8.. I know its something to do with pointers but I have nooo idea what. Have added *'s and &'s infront of the x's and nothing is working. Any help would be really appreciated :-)

It prints 8 because you are asking for the size of the pointer (x).

You can't actually print out the size of a block of allocated memory. You have to track that for yourself.

Oh!!! Ok, that makes sense... Thanks so much!

Quote:

---

Originally Posted by Sonny Trujillo

Code:

---

strucType makeBigger(structType  x, char ch)
{ /* Struct x was previous malloc to 8 bits*/
  x = realloc(x, 100);
  printf("%d", sizeof(x));
}

---

---

What happens to x when realloc fails?


Quzah.

Which is precisely why I recommend that people do not use realloc.
Virtually all of those who start threads on here and have code that includes realloc are using it wrong.