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path: root/test/ruby/test_bignum.rb
 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 ``` ``````require 'test/unit' class TestBignum < Test::Unit::TestCase def fact(n) return 1 if n == 0 f = 1 while n>0 f *= n n -= 1 end return f end def test_bignum \$x = fact(40) assert_equal(\$x, \$x) assert_equal(\$x, fact(40)) assert(\$x < \$x+2) assert(\$x > \$x-2) assert_equal(815915283247897734345611269596115894272000000000, \$x) assert_not_equal(815915283247897734345611269596115894272000000001, \$x) assert_equal(815915283247897734345611269596115894272000000001, \$x+1) assert_equal(335367096786357081410764800000, \$x/fact(20)) \$x = -\$x assert_equal(-815915283247897734345611269596115894272000000000, \$x) assert_equal(2-(2**32), -(2**32-2)) assert_equal(2**32 - 5, (2**32-3)-2) for i in 1000..1014 assert_equal(2 ** i, 1 << i) end n1 = 1 << 1000 for i in 1000..1014 assert_equal(n1, 1 << i) n1 *= 2 end n2=n1 for i in 1..10 n1 = n1 / 2 n2 = n2 >> 1 assert_equal(n1, n2) end for i in 4000..4096 n1 = 1 << i; assert_equal(n1-1, (n1**2-1) / (n1+1)) end end def test_calc b = 10**80 a = b * 9 + 7 assert_equal(7, a.modulo(b)) assert_equal(-b + 7, a.modulo(-b)) assert_equal(b + -7, (-a).modulo(b)) assert_equal(-7, (-a).modulo(-b)) assert_equal(7, a.remainder(b)) assert_equal(7, a.remainder(-b)) assert_equal(-7, (-a).remainder(b)) assert_equal(-7, (-a).remainder(-b)) assert_equal(10000000000000000000100000000000000000000, 10**40+10**20) assert_equal(100000000000000000000, 10**40/10**20) a = 677330545177305025495135714080 b = 14269972710765292560 assert_equal(0, a % b) assert_equal(0, -a % b) end def shift_test(a) b = a / (2 ** 32) c = a >> 32 assert_equal(b, c) b = a * (2 ** 32) c = a << 32 assert_equal(b, c) end def test_shift shift_test(-4518325415524767873) shift_test(-0xfffffffffffffffff) end end ``````