Constant pointers and pointees

const.c

#include <stdio.h>

int main(void)
{
	int a = 1;
	int b = 2;
	const int c = 3;

	int *pa = &a;
	const int *pb = &b;
	const int *const pc = &c;

	*pa += 1;
	*pb += 1; // Error
	*(int *)pb += 1; // Oh boy...
	pa = (int *)pc; // ^ This
	*pa += 1; // c is not so const after all
	pc = pb; // Error

	printf("a = %d, b = %d, c = %d\n", a, b, c);

	return 0;
}

C: A Reference Manual, 5th Edition, Sec. 4.4 Type Specifiers and Qualifiers, pp. 89-91