kurisu@sern:~/projects/nurupo$ cat main.c

int main()
{
	int *ptr = 0;

	*ptr = 42;

	return 0;
}

kurisu@sern:~/projects/nurupo$ gcc -o main main.c
kurisu@sern:~/projects/nurupo$ ./main
Segmentation fault (コアダンプ) _