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def assert_rational(real, exp)
assert_float real.numerator, exp.numerator
assert_float real.denominator, exp.denominator
end
assert 'Rational' do
r = 5r
assert_equal Rational, r.class
assert_equal [r.numerator, r.denominator], [5, 1]
end
assert 'Rational#to_f' do
assert_float Rational(2).to_f, 2.0
assert_float Rational(9, 4).to_f, 2.25
assert_float Rational(-3, 4).to_f, -0.75
assert_float Rational(20, 3).to_f, 6.666666666666667
end
assert 'Rational#to_i' do
assert_equal Rational(2, 3).to_i, 0
assert_equal Rational(3).to_i, 3
assert_equal Rational(300.6).to_i, 300
assert_equal Rational(98, 71).to_i, 1
assert_equal Rational(-30, 2).to_i, -15
end
assert 'Rational#*' do
assert_rational Rational(2, 3) * Rational(2, 3), Rational(4, 9)
assert_rational Rational(900) * Rational(1), Rational(900, 1)
assert_rational Rational(-2, 9) * Rational(-9, 2), Rational(1, 1)
assert_rational Rational(9, 8) * 4, Rational(9, 2)
assert_float Rational(20, 9) * 9.8, 21.77777777777778
end
assert 'Rational#+' do
assert_rational Rational(2, 3) + Rational(2, 3), Rational(4, 3)
assert_rational Rational(900) + Rational(1), Rational(901, 1)
assert_rational Rational(-2, 9) + Rational(-9, 2), Rational(-85, 18)
assert_rational Rational(9, 8) + 4, Rational(41, 8)
assert_float Rational(20, 9) + 9.8, 12.022222222222222
end
assert 'Rational#-' do
assert_rational Rational(2, 3) - Rational(2, 3), Rational(0, 1)
assert_rational Rational(900) - Rational(1), Rational(899, 1)
assert_rational Rational(-2, 9) - Rational(-9, 2), Rational(77, 18)
assert_rational Rational(9, 8) - 4, Rational(-23, 8)
assert_float Rational(20, 9) - 9.8, -7.577777777777778
end
assert 'Rational#/' do
assert_rational Rational(2, 3) / Rational(2, 3), Rational(1, 1)
assert_rational Rational(900) / Rational(1), Rational(900, 1)
assert_rational Rational(-2, 9) / Rational(-9, 2), Rational(4, 81)
assert_rational Rational(9, 8) / 4, Rational(9, 32)
assert_float Rational(20, 9) / 9.8, 0.22675736961451246
end
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