gps

 xp1,yp1,zp1 = gps.locate()

print("veuillez entrer les coordonnes")
write ("x: ")
 xd = tonumber(read())
write ("\ny: ")
 yd = tonumber(read())+1
write ("\nz: ")
 zd = tonumber(read())

-- voir dans quel sens est la tortue

turtle.forward()
local xp2,yp2,zp2 = gps.locate()

if xd < xp2 then

    if xp1 < xp2 then
    turtle.turnRight()
    turtle.turnRight()
    elseif xp1 == xp2 and zp1 < zp2 then
    turtle.turnRight()
    elseif xp1 == xp2 and zp1 > zp2 then
    turtle.turnLeft()
    end

end

if xd > xp2 then

    if xp1 > xp2 then
    turtle.turnRight()
    turtle.turnRight()
    elseif xp1 == xp2 and zp1 < zp2 then
    turtle.turnLeft()
    elseif xp1 == xp2 and zp1 > zp2 then
    turtle.turnRight()
    end

end

if xd == xp2 then
    if zp1 > zp2 and zp2 < zd then
    turtle.turnLeft()
    turtle.turnLeft()
    elseif zp1 < zp2 and zp2 > zd then
    turtle.turnLeft()
    turtle.turnLeft()
    end

end


-- faire déplacer la tortue

while xp2~=xd or yp2~=yd or zp2~=zd do

-- xd < xp2

if xd < xp2 then
for i = 0, 1 do
    if xp2~= xd then
        if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
    end
end

if zp2 > zd then
turtle.turnRight()
    for k = 0 , 1 do
        if zp2 ~= zd then
            if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
        end
    end
    if xd < xp2 then
    turtle.turnLeft()
    end
elseif zp2 < zd then
turtle.turnLeft()
    for k=0,2 do
        if zp2 ~= zd then
            if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
        end
    end
    if xd < xp2 then
    turtle.turnRight()
    end
end
xp2,yp2,zp2 = gps.locate()
end

--xd > xp2

if xd > xp2 then
for i = 0, 1 do
    if xp2~= xd then
        if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
    end
end

if zp2 > zd then
turtle.turnLeft()
    for k = 0 , 1 do
        if zp2 ~= zd then
            if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
        end
    end
    if xd > xp2 then
    turtle.turnRight()
    end
elseif zp2 < zd then
turtle.turnRight()
    for k=0,1 do
        if zp2 ~= zd then
            if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
        end
    end
    if xd > xp2 then
    turtle.turnLeft()
    end
end
xp2,yp2,zp2 = gps.locate()
end

-- xd = xp2

    if xd == xp2  then
    while zp2 ~= zd do
    if turtle.forward() then
        if yd > yp2 and yd ~= yp2 then
        turtle.up()
        xp2,yp2,zp2 = gps.locate()
        elseif yd < yp2 and yd ~= yp2 then
        turtle.down()
        xp2,yp2,zp2 = gps.locate()
        end
        xp2,yp2,zp2 = gps.locate()
        else
        while not turtle.forward() do
            if not turtle.up() then
            turtle.turnRight()
            turtle.forward()
            turtle.turnLeft()
            xp2,yp2,zp2 = gps.locate()
                if not turtle.forward() then
                turtle.turnLeft()
                turtle.forward()
                turtle.forward()
                turtle.turnRight()
                turtle.forward()
                xp2,yp2,zp2 = gps.locate()
                end
            end
        end
        xp2,yp2,zp2 = gps.locate()
        end
    end
    end
    if xp2 == xd and zp2 == zd and yp2 ~= yd then
        if yd < yp2 then
            while yp2 ~= yd do
            turtle.down()
            xp2,yp2,zp2 = gps.locate()
            end
        elseif yd > yp2 then
            while yp2 ~= yd do
            turtle.up()
            xp2,yp2,zp2 = gps.locate()
            end
        end
    end
end

print("\nfin")