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class Polynomial | |
attr_reader :vars | |
def initialize(vars) | |
raise ArgumentError, 'Need at least 2 coefficients' if vars.size <2 | |
number_of_terms ||= vars.size - 1 | |
final_output = [] | |
i=0 | |
vars.each do |var| | |
if var == 0 | |
final_output << ("") | |
else | |
if var == 1 || var == -1 | |
final_output << ("+" if var == 1) unless i == 0 | |
final_output << ("-" if var == -1) | |
final_output << "x" | |
final_output << "^#{number_of_terms}" unless number_of_terms == 1 | |
else | |
final_output << ("+" if var > 0) unless i == 0 | |
final_output << ("-" if var < 0) | |
final_output << (var.to_i * -1 if var < 0) | |
final_output << (var.to_i if var > 0) | |
final_output << "x" unless number_of_terms == 0 | |
final_output << "^#{number_of_terms}" unless number_of_terms == 0 || number_of_terms == 1 | |
end | |
end | |
i=i+1 | |
number_of_terms = number_of_terms.to_i - 1 | |
end | |
@final_output = final_output.to_s | |
@final_output = "0" if final_output.to_s.empty? | |
end | |
def to_s | |
@final_output | |
end | |
end |
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