Sha256: 395a6b59f8cdf30ef6550b9d6172235398562d098ea0a029c41368c48a01f5c8
Contents?: true
Size: 750 Bytes
Versions: 20
Compression:
Stored size: 750 Bytes
Contents
describe Integer, "#harshad?" do
# A005349
@seq = [1,2,3,4,5,6,7,8,9,10,12,18,20,21,24,27,30,36,40,
42,45,48,50,54,60,63,70,72,80,81,84,90,100,102,
108,110,111,112,114,117,120,126,132,133,135,140,
144,150,152,153,156,162,171,180,190,192,195,198,
200,201,204].to_seq
@seq.each do |n|
it "returns true for Harshad (Niven) number #{n}" do
n.should be_harshad
end
it "returns false for negative Harshad (Niven) number #{-n}" do
(-n).should_not be_harshad
end
end
@seq.invert.sample(10).each do |n|
it "returns false for non-Harshad (Niven) number #{n}" do
n.should_not be_harshad
end
end
it "returns false for 0" do
0.should_not be_harshad
end
end
Version data entries
20 entries across 20 versions & 1 rubygems