What happens when we try to access null pointer in C?

Answer 1

Most of the CPUs support virtual memory, a page fault exception will be usually issued if you try to read at memory address 0x0 i.e. NULL . The OS page fault handler will be invoked, the OS will then decide that the page is invalid and aborts your program.

Answer 2

NULL pointer is pointer that is pointing to nothing (No memory location). Accessing null pointer in C may lead a program to crash. So, Null pointer should not be accessed in a program.