how to jmp to the function?

hello:
i am new in assembly language, and i want to test the "jmp" instruction, try to jmp to the function that i define, and failed. what's wrong with my code?
here's the code:

using wxDevC++, windows xp sp3

Code:

---

void ShowMessage();
int main(int argc, char *argv[])
{ 
   
  printf("%p",ShowMessage);
  printf("\n");
 asm(
      "jmp 0x00401332;"     
  );
  //  0x00401332 is ShowMessage address

system("PAUSE");       
    return 0;

}

void ShowMessage()
{
    MessageBox (0, "ShowMessage()!\n", "Hi", MB_ICONINFORMATION);
   
}

---

Did you try to include libraries for assembly operations in this language you are using? Something like asm.h maybe? Just try this link <http://hte.sourceforge.net/doxygenized-0.8.0pre1/asm_8h.html>. It might help. :)

Or <stdio.h> also to be sure.

Here's another link: <http://www.digitalmars.com/ctg/ctgInlineAsm.html>