Why do my character don't move ?

Sun, 12 Jun 2016 10:51:36 UTC

Hello, i'm coding a character movement but it don't work, why ? :(

Code :

function _init()
    hero = {}
    hero.x = 64
    hero.y = 64
end

function _uptade()
    if btn(0) then 
        hero.x = hero.x - 1
    end
    if btn(1) then 
        hero.x = hero.x + 1
    end
end

function _draw()
    cls()
    spr(0,hero.x,hero.y)
end

my character don't move :(

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Why do my character don't move ?