How to write a data in particular address in C [duplicate]

Question

I need to write 0x00001234 in the address 0x8000000, is it possible in C?

Answer 1

If you work with hardware register in embedded system then standard way is:

int volatile * const p_reg = (int *) 0x8000000;
*p_reg = 0x1234;

You can have a lot of problems with optimizing compiler, if you omit volatile

Answer 2

You can, but you will have a segfault 99.9999..9% of the time because your program won't have access on this memory address.

int *nb = (int *) 0x8000000;
*nb = 0x00001234;