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--We can represent a polynomial anxn + an-1xn-1 + : : : + a1x1 + a0
--in Lua as a list of its coefficients, such as {a0,a1,...,an}.
--Write a function that receives a polynomial (represented as a table) and a
--value for x and returns the polynomial value.
function computePoly(poly,x)
local n = #poly --多項式系數(shù)個數(shù)
local sum = poly[n] --初始化為多項式最高項數(shù)對應系數(shù)
for i=n-1,1,-1 do
sum = sum * x + poly[i] --循環(huán)n-1次
end
return sum
end
print(computePoly({1,2,4,8,16},2))--第1個參數(shù)為多項式對應系數(shù),第二個參數(shù)為對應x的值
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