33 lines
726 B
Lua
33 lines
726 B
Lua
function readNumber ()
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local a = io.read()
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if tonumber(a) == nil then
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os.exit()
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else
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return a
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end
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end
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io.write("Enter a, b and c: ")
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local a = readNumber()
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local b = readNumber()
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local c = readNumber()
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io.write("a: " .. a .. ", b: " .. b .. ", c: " .. c .. "\n")
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d = b^2 - 4*a*c
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io.write("Discriminant: " .. d)
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if d>0 then
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--5,6,1 => -0.2 and -1
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print('Real distinct roots')
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local r1 = (-b + math.sqrt(d))/(2*a)
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local r2 = (-b - math.sqrt(d))/(2*a)
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print("Roots are " .. r1 .. " and " .. r2 .. "\n")
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elseif d<0 then
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--5,2,1 => -0.2 +/- 0.4i
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print('Complex roots.')
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else
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print('Real equal roots.')
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local r1 = (-b + math.sqrt(d))/(2*a)
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print("Roots are " .. r1 .. " and " .. r1 .. "\n")
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end
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