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v/vlib/math/big/big_test.v

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import big
fn test_new_big() {
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n := big.new()
assert sizeof(big.Number) == 128
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assert n.hexstr() == '0'
}
fn test_from_int() {
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assert big.from_int(255).hexstr() == 'ff'
assert big.from_int(127).hexstr() == '7f'
assert big.from_int(1024).hexstr() == '400'
assert big.from_int(2147483647).hexstr() == '7fffffff'
assert big.from_int(-1).hexstr() == 'ffffffffffffffff'
}
fn test_from_u64() {
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assert big.from_u64(255).hexstr() == 'ff'
assert big.from_u64(127).hexstr() == '7f'
assert big.from_u64(1024).hexstr() == '400'
assert big.from_u64(4294967295).hexstr() == 'ffffffff'
assert big.from_u64(4398046511104).hexstr() == '40000000000'
assert big.from_u64(-1).hexstr() == 'ffffffffffffffff'
}
fn test_plus() {
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a := big.from_u64(2)
b := big.from_u64(3)
c := a + b
assert c.hexstr() == '5'
assert (big.from_u64(1024) + big.from_u64(1024)).hexstr() == '800'
}
fn test_minus() {
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a := big.from_u64(2)
b := big.from_u64(3)
c := b - a
assert c.hexstr() == '1'
e := big.from_u64(1024)
ee := e - e
assert ee.hexstr() == '0'
}
fn test_divide() {
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a := big.from_u64(2)
b := big.from_u64(3)
c := b / a
assert c.hexstr() == '1'
assert (b % a).hexstr() == '1'
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e := big.from_u64(1024) // dec(1024) == hex(0x400)
ee := e / e
assert ee.hexstr() == '1'
assert (e / a).hexstr() == '200'
assert (e / (a * a)).hexstr() == '100'
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}
fn test_multiply() {
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a := big.from_u64(2)
b := big.from_u64(3)
c := b * a
assert c.hexstr() == '6'
e := big.from_u64(1024)
e2 := e * e
e4 := e2 * e2
e8 := e2 * e2 * e2 * e2
e9 := e8 + big.from_u64(1)
d := ((e9 * e9) + b) * c
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assert e4.hexstr() == '10000000000'
assert e8.hexstr() == '100000000000000000000'
assert e9.hexstr() == '100000000000000000001'
assert d.hexstr() == '60000000000000000000c00000000000000000018'
}
fn test_mod() {
assert (big.from_u64(13) % big.from_u64(10)).int() == 3
assert (big.from_u64(13) % big.from_u64(9)).int() == 4
assert (big.from_u64(7) % big.from_u64(5)).int() == 2
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}
fn test_str() {
assert big.from_u64(255).str() == '255'
assert big.from_u64(127).str() == '127'
assert big.from_u64(1024).str() == '1024'
assert big.from_u64(4294967295).str() == '4294967295'
assert big.from_u64(4398046511104).str() == '4398046511104'
assert big.from_int(4294967295).str() == '18446744073709551615'
assert big.from_int(-1).str() == '18446744073709551615'
assert big.from_string('e'.repeat(80)).str() ==
'1993587900192849410235353592424915306962524220866209251950572167300738410728597846688097947807470'
}
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fn test_factorial() {
f5 := big.factorial(big.from_u64(5))
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assert f5.hexstr() == '78'
f100 := big.factorial(big.from_u64(100))
assert f100.hexstr() ==
'1b30964ec395dc24069528d54bbda40d16e966ef9a70eb21b5b2943a321cdf10391745570cca9420c6ecb3b72ed2ee8b02ea2735c61a000000000000000000000000'
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}