help with nibbles-like program

[WhatAmIDoing]

hey i need some help can anyone help me fix this program

code:

setscreen ("graphics") var chars : array char of boolean var x, y, a, b, count, c : int count := 15 x := maxx div 2 y := maxy div 2 procedure box     randint (a, 20, maxx - 20)     randint (b, 20, maxy - 20)     drawfillbox (a, b, a + 20, b + 20, green) end box loop     drawfillbox (0, 0, maxx, maxy, black)     box     loop         Input.KeyDown (chars)         if chars (KEY_UP_ARROW) then             y += 10         elsif chars (KEY_DOWN_ARROW) then             y -= 10         elsif chars (KEY_LEFT_ARROW) then             x -= 10         elsif chars (KEY_RIGHT_ARROW) then             x += 10         end if         if x > a and x < a + 20 and y > b and y < b + 20 then             drawfillbox (a, b, a + 20, b + 20, white)             count += 10             exit         end if         randint (c, 0, 50)         drawfilloval (x, y, 5, 5, c)         drawfillbox (a, b, a + 20, b + 20, green)         drawfilloval (x, y + count, 10, 10, black)         drawfilloval (x, y - count, 10, 10, black)         drawfilloval (x + count, y, 10, 10, black)         drawfilloval (x - count, y, 10, 10, black)         delay (20)     end loop end loop

mod edit: please post in the right section next time, and please use a better topic name (and if at all possible, be more descriptive about your problem).

[McKenzie]

You are assuming that the snake travels in a straight line. You need to keep track of each segment of the snake in an array then you can draw and erase them one at a time.