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import math.big
fn test_new_big() {
n := big.new()
assert sizeof(big.Number) == 128
assert n.hexstr() == '0'
}
fn test_from_int() {
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() {
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() {
mut 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'
a += b
assert a.hexstr() == '5'
a.inc()
assert a.hexstr() == '6'
a.dec()
a.dec()
assert a.hexstr() == '4'
}
fn test_minus() {
a := big.from_u64(2)
mut b := big.from_u64(3)
c := b - a
assert c.hexstr() == '1'
e := big.from_u64(1024)
ee := e - e
assert ee.hexstr() == '0'
b -= a
assert b.hexstr() == '1'
}
fn test_divide() {
a := big.from_u64(2)
mut b := big.from_u64(3)
c := b / a
assert c.hexstr() == '1'
assert (b % a).hexstr() == '1'
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'
b /= a
assert b.hexstr() == '1'
}
fn test_multiply() {
mut 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
assert e4.hexstr() == '10000000000'
assert e8.hexstr() == '100000000000000000000'
assert e9.hexstr() == '100000000000000000001'
assert d.hexstr() == '60000000000000000000c00000000000000000018'
a *= b
assert a.hexstr() == '6'
}
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
}
fn test_divmod() {
x, y := big.divmod(big.from_u64(13), big.from_u64(10))
assert x.int() == 1
assert y.int() == 3
p, q := big.divmod(big.from_u64(13), big.from_u64(9))
assert p.int() == 1
assert q.int() == 4
c, d := big.divmod(big.from_u64(7), big.from_u64(5))
assert c.int() == 1
assert d.int() == 2
}
fn test_from_str() {
assert big.from_string('9870123').str() == '9870123'
assert big.from_string('').str() == '0'
assert big.from_string('0').str() == '0'
assert big.from_string('1').str() == '1'
for i := 1; i < 307; i += 61 {
input := '9'.repeat(i)
out := big.from_string(input).str()
// eprintln('>> i: $i input: $input.str()')
// eprintln('>> i: $i out: $out.str()')
assert input == out
}
}
fn test_from_hex_str() {
assert big.from_hex_string('0x123').hexstr() == '123'
for i in 1 .. 33 {
input := 'e'.repeat(i)
out := big.from_hex_string(input).hexstr()
assert input == out
}
assert big.from_string('0').hexstr() == '0'
}
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(int(4294967295)).str() == '18446744073709551615'
assert big.from_int(-1).str() == '18446744073709551615'
assert big.from_hex_string('e'.repeat(80)).str() == '1993587900192849410235353592424915306962524220866209251950572167300738410728597846688097947807470'
}
fn test_factorial() {
f5 := big.factorial(big.from_u64(5))
assert f5.hexstr() == '78'
f100 := big.factorial(big.from_u64(100))
assert f100.hexstr() == '1b30964ec395dc24069528d54bbda40d16e966ef9a70eb21b5b2943a321cdf10391745570cca9420c6ecb3b72ed2ee8b02ea2735c61a000000000000000000000000'
}
fn trimbytes(n int, x []byte) []byte {
mut res := x.clone()
res.trim(n)
return res
}
fn test_bytes() {
assert big.from_int(0).bytes().len == 128
assert big.from_hex_string('e'.repeat(100)).bytes().len == 128
assert trimbytes(3, big.from_int(1).bytes()) == [byte(0x01), 0x00, 0x00]
assert trimbytes(3, big.from_int(1024).bytes()) == [byte(0x00), 0x04, 0x00]
assert trimbytes(3, big.from_int(1048576).bytes()) == [byte(0x00), 0x00, 0x10]
}
fn test_bytes_trimmed() {
assert big.from_int(0).bytes_trimmed().len == 0
assert big.from_hex_string('AB'.repeat(50)).bytes_trimmed().len == 50
assert big.from_int(1).bytes_trimmed() == [byte(0x01)]
assert big.from_int(1024).bytes_trimmed() == [byte(0x00), 0x04]
assert big.from_int(1048576).bytes_trimmed() == [byte(0x00), 0x00, 0x10]
}
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