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function distance (x1, y1, x2, y2 : real) : real
result round (sqrt ((x2 - x1) ** 2 + (y2 - y1) ** 2))
end distance
var midx : int := maxx div 2
var midy : int := maxy div 2
var mx, my, mb : int
for i : 1 .. 5
drawoval (midx, midy, i * 20, i * 20, 84)
end for
loop
mousewhere (mx,my,mb)
if mb = 1 and distance (mx, my, midx, midy) < 3 then
locate (1, 1)
put "1000 pts."
end if
end loop
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