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Contents
describe Integer, "#practical?" do
PRACTICAL =[1,2,4,6,8,12,16,18,20,24,28,30,32,36,40,42,48,54,
56,60,64,66,72,78,80,84,88,90,96,100,104,108,112,
120,126,128,132,140,144,150,156,160,162,168,176,
180,192,196,198,200,204,208,210,216,220,224,228,
234,240,252]
it "returns true for any practical number" do
PRACTICAL.each do |number|
number.should be_practical
end
end
it "returns false for any non-practical number" do
((1..252).to_a - PRACTICAL).each do |number|
number.should_not be_practical
end
end
it "returns true for powers of two" do
[38, 41, 2, 5].each do |pow|
(2 ** pow).should be_practical
end
end
it "returns true for perfect numbers" do
[6, 28, 496, 8128, 33550336, 8589869056, 137438691328].each do |n|
n.should be_practical
end
end
end
Version data entries
36 entries across 36 versions & 1 rubygems