mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
131 lines
3.5 KiB
V
131 lines
3.5 KiB
V
import math.big
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fn test_new_big() {
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n := big.new()
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assert sizeof(big.Number) == 128
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assert n.hexstr() == '0'
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}
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fn test_from_int() {
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assert big.from_int(255).hexstr() == 'ff'
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assert big.from_int(127).hexstr() == '7f'
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assert big.from_int(1024).hexstr() == '400'
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assert big.from_int(2147483647).hexstr() == '7fffffff'
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assert big.from_int(-1).hexstr() == 'ffffffffffffffff'
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}
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fn test_from_u64() {
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assert big.from_u64(255).hexstr() == 'ff'
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assert big.from_u64(127).hexstr() == '7f'
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assert big.from_u64(1024).hexstr() == '400'
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assert big.from_u64(4294967295).hexstr() == 'ffffffff'
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assert big.from_u64(4398046511104).hexstr() == '40000000000'
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assert big.from_u64(-1).hexstr() == 'ffffffffffffffff'
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}
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fn test_plus() {
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mut a := big.from_u64(2)
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b := big.from_u64(3)
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c := a + b
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assert c.hexstr() == '5'
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assert (big.from_u64(1024) + big.from_u64(1024)).hexstr() == '800'
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a += b
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assert a.hexstr() == '5'
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}
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fn test_minus() {
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a := big.from_u64(2)
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mut b := big.from_u64(3)
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c := b - a
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assert c.hexstr() == '1'
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e := big.from_u64(1024)
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ee := e - e
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assert ee.hexstr() == '0'
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b -= a
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assert b.hexstr() == '1'
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}
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fn test_divide() {
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a := big.from_u64(2)
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mut b := big.from_u64(3)
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c := b / a
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assert c.hexstr() == '1'
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assert (b % a).hexstr() == '1'
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e := big.from_u64(1024) // dec(1024) == hex(0x400)
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ee := e / e
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assert ee.hexstr() == '1'
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assert (e / a).hexstr() == '200'
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assert (e / (a * a)).hexstr() == '100'
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b /= a
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assert b.hexstr() == '1'
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}
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fn test_multiply() {
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mut a := big.from_u64(2)
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b := big.from_u64(3)
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c := b * a
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assert c.hexstr() == '6'
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e := big.from_u64(1024)
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e2 := e * e
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e4 := e2 * e2
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e8 := e2 * e2 * e2 * e2
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e9 := e8 + big.from_u64(1)
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d := ((e9 * e9) + b) * c
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assert e4.hexstr() == '10000000000'
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assert e8.hexstr() == '100000000000000000000'
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assert e9.hexstr() == '100000000000000000001'
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assert d.hexstr() == '60000000000000000000c00000000000000000018'
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a *= b
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assert a.hexstr() == '6'
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}
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fn test_mod() {
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assert (big.from_u64(13) % big.from_u64(10)).int() == 3
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assert (big.from_u64(13) % big.from_u64(9)).int() == 4
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assert (big.from_u64(7) % big.from_u64(5)).int() == 2
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}
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fn test_from_str() {
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assert big.from_string('9870123').str() == '9870123'
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assert big.from_string('').str() == '0'
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assert big.from_string('0').str() == '0'
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assert big.from_string('1').str() == '1'
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for i := 1; i < 307; i += 61 {
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input := '9'.repeat(i)
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out := big.from_string(input).str()
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// eprintln('>> i: $i input: $input.str()')
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// eprintln('>> i: $i out: $out.str()')
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assert input == out
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}
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}
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fn test_from_hex_str() {
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assert big.from_hex_string('0x123').hexstr() == '123'
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for i in 1 .. 33 {
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input := 'e'.repeat(i)
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out := big.from_hex_string(input).hexstr()
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assert input == out
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}
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assert big.from_string('0').hexstr() == '0'
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}
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fn test_str() {
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assert big.from_u64(255).str() == '255'
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assert big.from_u64(127).str() == '127'
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assert big.from_u64(1024).str() == '1024'
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assert big.from_u64(4294967295).str() == '4294967295'
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assert big.from_u64(4398046511104).str() == '4398046511104'
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assert big.from_int(4294967295).str() == '18446744073709551615'
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assert big.from_int(-1).str() == '18446744073709551615'
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assert big.from_hex_string('e'.repeat(80)).str() ==
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'1993587900192849410235353592424915306962524220866209251950572167300738410728597846688097947807470'
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}
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fn test_factorial() {
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f5 := big.factorial(big.from_u64(5))
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assert f5.hexstr() == '78'
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f100 := big.factorial(big.from_u64(100))
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assert f100.hexstr() ==
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'1b30964ec395dc24069528d54bbda40d16e966ef9a70eb21b5b2943a321cdf10391745570cca9420c6ecb3b72ed2ee8b02ea2735c61a000000000000000000000000'
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}
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