I question some people (#28208)

code/__DEFINES/_math.dm

@@ -63,9 +63,9 @@
 
 #define ISABOUTEQUAL(a, b, deviation) (deviation ? abs((a) - (b)) <= deviation : abs((a) - (b)) <= 0.1)
 
-#define ISEVEN(x) (x % 2 == 0)
+#define ISEVEN(x) (!((x) & 1))
 
-#define ISODD(x) (x % 2 != 0)
+#define ISODD(x) ((x) & 1)
 
 // Returns true if val is from min to max, inclusive.
 #define ISINRANGE(val, min, max) (min <= val && val <= max)

code/__DEFINES/hud.dm

@@ -77,7 +77,7 @@
 
 /proc/ui_hand_position(i)
 	// values based on old hand ui positions (CENTER:-/+16,SOUTH:5)
-	var/x_off = i % 2 ? 0 : -1
+	var/x_off = ISODD(i) ? 0 : -1
 	var/y_off = round((i-1) / 2)
 	return"CENTER+[x_off]:16,SOUTH+[y_off]:5"
 

code/__HELPERS/text.dm

@@ -293,7 +293,7 @@
 		return copytext(new_message, 1, length + 1)
 	if(delta == 1)
 		return new_message + " "
-	if(delta % 2)
+	if(ISODD(delta))
 		new_message = " " + new_message
 		delta--
 	var/spaces = add_lspace("",delta/2-1)

code/__HELPERS/unsorted.dm

@@ -268,7 +268,7 @@
 	f = round(f)
 	f = max(low, f)
 	f = min(high, f)
-	if((f % 2) == 0) //Ensure the last digit is an odd number
+	if(ISEVEN(f)) //Ensure the last digit is an odd number
 		f += 1
 	return f
 

code/datums/components/footstep.dm

@@ -61,7 +61,7 @@
 	if(steps >= 6)
 		steps = 0
 
-	if(steps % 2)
+	if(ISODD(steps))
 		return
 
 	if(steps != 0 && !has_gravity(LM, T)) // don't need to step as often when you hop around

code/game/objects/effects/spawners/airlock_spawner.dm

@@ -83,12 +83,12 @@ This spawner places pipe leading up to the interior door, you will need to finis
 	var/obj/machinery/access_button/the_button = spawn_button(T, is_this_an_interior_airlock ? interior_direction : exterior_direction, is_this_an_interior_airlock)
 	if(one_door_only == DOOR_NORMAL_PLACEMENT) //We only need one door, we are done
 		return
-	if(!(tiles_in_x_direction % 2) && (is_this_an_interior_airlock && north_or_south_interior || !is_this_an_interior_airlock && north_or_south_exterior)) //Handle extra airlock for aesthetics
+	if(ISEVEN(tiles_in_x_direction) && (is_this_an_interior_airlock && north_or_south_interior || !is_this_an_interior_airlock && north_or_south_exterior)) //Handle extra airlock for aesthetics
 		A = new door_type(get_step(T, EAST))
 		handle_door_stuff(A, is_this_an_interior_airlock)
 		if(one_door_only == DOOR_FLIPPED_PLACEMENT)
 			the_button.forceMove(get_step(the_button, EAST))
-	else if(!(tiles_in_y_direction % 2) && (is_this_an_interior_airlock && !north_or_south_interior || !is_this_an_interior_airlock && !north_or_south_exterior)) //Handle extra airlock for aesthetics
+	else if(ISEVEN(tiles_in_y_direction) && (is_this_an_interior_airlock && !north_or_south_interior || !is_this_an_interior_airlock && !north_or_south_exterior)) //Handle extra airlock for aesthetics
 		A = new door_type(get_step(T, NORTH))
 		handle_door_stuff(A, is_this_an_interior_airlock)
 		if(one_door_only == DOOR_FLIPPED_PLACEMENT)

code/game/objects/structures/safe.dm

@@ -293,7 +293,7 @@ GLOBAL_LIST_EMPTY(safes)
 			for(var/i = 1 to ticks)
 				dial = WRAP(dial - 1, 0, 100)
 
-				var/invalid_turn = current_tumbler_index % 2 == 0 || current_tumbler_index > number_of_tumblers
+				var/invalid_turn = ISEVEN(current_tumbler_index) || current_tumbler_index > number_of_tumblers
 				if(invalid_turn) // The moment you turn the wrong way or go too far, the tumblers reset
 					current_tumbler_index = 1
 
@@ -313,7 +313,7 @@ GLOBAL_LIST_EMPTY(safes)
 			for(var/i = 1 to ticks)
 				dial = WRAP(dial + 1, 0, 100)
 
-				var/invalid_turn = current_tumbler_index % 2 != 0 || current_tumbler_index > number_of_tumblers
+				var/invalid_turn = ISODD(current_tumbler_index) || current_tumbler_index > number_of_tumblers
 				if(invalid_turn) // The moment you turn the wrong way or go too far, the tumblers reset
 					current_tumbler_index = 1
 

code/modules/antagonists/traitor/datum_traitor.dm

@@ -234,7 +234,7 @@ RESTRICT_TYPE(/datum/antagonist/traitor)
 			if(freq < 1451 || freq > 1459)
 				freqlist += freq
 			freq += 2
-			if((freq % 2) == 0)
+			if(ISEVEN(freq))
 				freq += 1
 		freq = pick(freqlist)
 

code/modules/mob/living/carbon/carbon_life.dm

@@ -46,7 +46,7 @@
 
 //Start of a breath chain, calls breathe()
 /mob/living/carbon/handle_breathing(times_fired)
-	if(times_fired % 2 == 1)
+	if(ISODD(times_fired))
 		var/datum/milla_safe/carbon_breathe/milla = new()
 		milla.invoke_async(src)
 	else

code/modules/procedural_mapping/mapGenerator.dm

@@ -44,7 +44,7 @@
 
 	//Even sphere correction engage
 	var/offByOneOffset = 1
-	if(bigZ % 2 == 0)
+	if(ISEVEN(bigZ))
 		offByOneOffset = 0
 
 	for(var/i = lilZ, i <= bigZ+offByOneOffset, i++)

code/modules/ruins/lavalandruin_code/puzzle.dm

@@ -104,7 +104,7 @@
 			if(current_ordering[j] < checked_value)
 				swap_tally++
 
-	return swap_tally % 2 == 0
+	return ISEVEN(swap_tally)
 
 //swap two tiles in same row
 /obj/effect/sliding_puzzle/proc/make_solvable()