| 1 | module big |
| 2 | |
| 3 | import rand |
| 4 | |
| 5 | fn test_divide_digit_array_03() { |
| 6 | a := [u64(0), 4] |
| 7 | b := [u64(0), 1] |
| 8 | mut q := []u64{len: a.len - b.len + 1} |
| 9 | mut r := []u64{len: a.len} |
| 10 | |
| 11 | divide_digit_array(a, b, mut q, mut r) |
| 12 | assert q == [u64(4)] |
| 13 | assert r == []u64{len: 0} |
| 14 | } |
| 15 | |
| 16 | fn test_divide_digit_array_04() { |
| 17 | a := [u64(2), 4] |
| 18 | b := [u64(0), 1] |
| 19 | mut q := []u64{len: a.len - b.len + 1} |
| 20 | mut r := []u64{len: a.len} |
| 21 | |
| 22 | divide_digit_array(a, b, mut q, mut r) |
| 23 | assert q == [u64(4)] |
| 24 | assert r == [u64(2)] |
| 25 | } |
| 26 | |
| 27 | fn test_divide_digit_array_05() { |
| 28 | a := [u64(2), 4, 5] |
| 29 | b := [u64(0), 1] |
| 30 | mut q := []u64{len: a.len - b.len + 1} |
| 31 | mut r := []u64{len: a.len} |
| 32 | |
| 33 | divide_digit_array(a, b, mut q, mut r) |
| 34 | assert q == [u64(4), 5] |
| 35 | assert r == [u64(2)] |
| 36 | } |
| 37 | |
| 38 | fn test_divide_digit_array_06() { |
| 39 | a := [u64(2), 4, 5, 3] |
| 40 | b := [u64(0), 0x8000] |
| 41 | mut q := []u64{len: a.len - b.len + 1} |
| 42 | mut r := []u64{len: a.len} |
| 43 | |
| 44 | divide_digit_array(a, b, mut q, mut r) |
| 45 | assert q == [u64(0xa000_00000000), 0x6000_00000000] |
| 46 | assert r == [u64(2), 4] |
| 47 | } |
| 48 | |
| 49 | fn test_many_divisions() { |
| 50 | for _ in 0 .. 100 { |
| 51 | a := random_number(30) |
| 52 | b := random_number(30) |
| 53 | c := a * b |
| 54 | assert c / a == b |
| 55 | assert c / b == a |
| 56 | q, r := a.div_mod(b) |
| 57 | assert (q * b) + r == a |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | fn random_number(length int) Integer { |
| 62 | numbers := '0123456789' |
| 63 | mut stri := '' |
| 64 | for _ in 0 .. length { |
| 65 | i := rand.intn(10) or { 0 } |
| 66 | nr := numbers[i] |
| 67 | stri = stri + nr.ascii_str() |
| 68 | } |
| 69 | res := integer_from_string(stri) or { panic(err) } |
| 70 | return res |
| 71 | } |
| 72 | |