Problem with unsigned int

[Kempelen]

In the following code:

	for (int i = 0; i < 64; ++i) {
		if (posicion[jugada_actual].piezas[i] != VACIO)
			hash ^= hash_piezas[posicion[jugada_actual].color[i]][posicion[jugada_actual].piezas[i]][i];
	}

if I change 'int i=0' for 'unsigned int = 0' I dont get the same result. In fact, the ^ operation result bad. Any ideas why?

[matsp]

Seeing as i is never negative, I don't see what difference it makes if it's signed or unsigned.

The ^ operator performs XOR, which is unlikely to be flawed in a compiler.

I do notice that hash is not initialized in the snippet of code you posted - is it possible that this is causing a problem?

--
Mats

[KIBO]

as a rule you should always use unsigned when using bit operators so Im pretty sure the problem is somewhere else in the code. Maybe as matsp pointed the hash not initialized

[brewbuck]

Seeing as i is never negative, I don't see what difference it makes if it's signed or unsigned.

The ^ operator performs XOR, which is unlikely to be flawed in a compiler.

I do notice that hash is not initialized in the snippet of code you posted - is it possible that this is causing a problem?

--
Mats

This looks like a Zobrist-key hash function from a game playing program. The hash value is pre-existent, and gets updated with the board state... Looks fine to me.