Const in C

const.c

void main()
{
	const int ANSWER = 42;
	int i = 0;

	//ANSWER = 43; // Can't assign to constant
	const int *cp;
	cp = &ANSWER;
	//*cp = 43; // cp points to a (const int)
	cp = &i; // cp's contract allows to modify its contents
	i = 1;
	//*cp = 2; // cp's contract is not to modify the referenced value

	// Assignint to const, the evil way:
	int *p;
	p = &ANSWER; // Warning only (error in C++)
	*p = 43;
}