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require 'test/unit'
$KCODE = 'none'
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
$x = fact(40)
assert($x == $x)
assert($x == fact(40))
assert($x < $x+2)
assert($x > $x-2)
assert($x == 815915283247897734345611269596115894272000000000)
assert($x != 815915283247897734345611269596115894272000000001)
assert($x+1 == 815915283247897734345611269596115894272000000001)
assert($x/fact(20) == 335367096786357081410764800000)
$x = -$x
assert($x == -815915283247897734345611269596115894272000000000)
assert(2-(2**32) == -(2**32-2))
assert(2**32 - 5 == (2**32-3)-2)
$good = true;
for i in 1000..1014
$good = false if ((1<<i) != (2**i))
end
assert($good)
$good = true;
n1=1<<1000
for i in 1000..1014
$good = false if ((1<<i) != n1)
n1 *= 2
end
assert($good)
$good = true;
n2=n1
for i in 1..10
n1 = n1 / 2
n2 = n2 >> 1
$good = false if (n1 != n2)
end
assert($good)
$good = true;
for i in 4000..4096
n1 = 1 << i;
if (n1**2-1) / (n1+1) != (n1-1)
p i
$good = false
end
end
assert($good)
end
def test_calc
b = 10**80
a = b * 9 + 7
assert(7 == a.modulo(b))
assert(-b + 7 == a.modulo(-b))
assert(b + -7 == (-a).modulo(b))
assert(-7 == (-a).modulo(-b))
assert(7 == a.remainder(b))
assert(7 == a.remainder(-b))
assert(-7 == (-a).remainder(b))
assert(-7 == (-a).remainder(-b))
assert(10**40+10**20 == 10000000000000000000100000000000000000000)
assert(10**40/10**20 == 100000000000000000000)
a = 677330545177305025495135714080
b = 14269972710765292560
assert(a % b == 0)
assert(-a % b == 0)
end
def test_shift
def shift_test(a)
b = a / (2 ** 32)
c = a >> 32
assert(b == c)
b = a * (2 ** 32)
c = a << 32
assert(b == c)
end
shift_test(-4518325415524767873)
shift_test(-0xfffffffffffffffff)
end
end
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