pointers - what is Fixed address variable in C -

i have seen many examples of in books , embedded system related sites.. per understanding , accessing data stored in fixed memory address . here example got in book;

unsigned char *p=(unsigned char *)0x41e; 

what use of type cast (unsigned char *) , there have used directly

unsigned char *p=0x41e; 

please explain in detail, what's use of type cast there, , storing address 0x41e pointer p or else stored in that?

i totally confused. please help.

what use of type cast.. (unsigned char *) , there have used directly unsigned char *p=0x41e

0x41e hexadecimal number , doesn't mean of type unsigned char *. should have tell compiler, casting unsigned char *, address (of type unsigned char *).

are storing address "0x41e" pointer p, or else stored in that.

yes, storing address 0x41e pointer p. doing unsigned char *p = (unsigned char *)0x41e, informing compiler p pointing memory location 0x41e , dereferencing p content stored @ memory location 0x41e.
check out running code:

#include <stdio.h> int main() {     unsigned char *p=(unsigned char *)0x41e;     printf("%p\n",p); }    

output:

0000041e  //output not 0x41e because '0x' used prefix inform compiler hexadecimal number