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# Tips and Tricks in Batari Basic

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I initiated this topic for both beginners and advanced programmers who can provide some tricks and tips from their programming approaches.

Here's an example of how we can use a single variable instead of using 3 variables to control the movement of three independent sprites. Each sprite is assigned a specific decimal value, designated here as 'v'. The sprites move up and down, reaching a certain screen height, and change direction, effectively bouncing back.

```       ; Moving sprite 1
if player1y = 18 then v = v | 1  ; Set the first decimal to 1 if sprite 1 has reached the upper wall
if player1y = 57 then v = v & 254  ; Set the first decimal to 0 if sprite 1 has reached the lower wall
if (v & 1) > 0 && player1y < 195 then player1y = player1y + 1  ; If the first decimal is 1, move sprite 1 downwards
if (v & 1) = 0 && player1y < 195 then player1y = player1y - 1  ; If the first decimal is 0, move sprite 1 upwards

; Moving sprite 2
if player2y = 67 then v = v | 2  ; Set the second decimal to 1 if sprite 2 has reached the upper wall
if player2y = 100 then v = v & 253  ; Set the second decimal to 0 if sprite 2 has reached the lower wall
if (v & 2) > 0 && player2y < 195 then player2y = player2y + 1  ; If the second decimal is 1, move sprite 2 downwards
if (v & 2) = 0 &&  player2y < 195 then player2y = player2y - 1  ; If the second decimal is 0, move sprite 2 upwards

; Moving sprite 3
if player3y = 110 then v = v | 4  ; Set the third decimal to 1 if sprite 3 has reached the upper wall
if player3y = 150 then v = v & 251  ; Set the third decimal to 0 if sprite 3 has reached the lower wall
if (v & 4) > 0 && player5y < 195 then player3y = player3y + 1  ; If the third decimal is 1, move sprite 3 downwards
if (v & 4) = 0 && player5y < 195 then player3y = player3y - 1  ; If the third decimal is 0, move sprite 3 upwards```

I use this < 195 when the sprite is in a section where movement is needed. For example, if we shoot the sprite, I move it to y = 200, and then movement is not necessary.

Edited by kikipdph
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