Read and write to a memory location

Question

After doing lot of research in Google, I found below program

#include 

int main()
{
    int val;
    char *a = (char*) 0x1000;
          


        

Answer 1

Issue of permission, the OS will protect memory space from random access.

You didn't specify the exact error, but my guess is you are getting a "segmentation fault" which would clearly indicate a memory access violation.