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math.big: change the return value of divmod to (quotient, remainder) (#10993)

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blackshirt 2021-07-30 06:28:32 +07:00 committed by GitHub
parent 6337325676
commit 1eac351f25
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2 changed files with 21 additions and 5 deletions

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@ -135,9 +135,10 @@ pub fn (n &Number) str() string {
} }
mut digits := []byte{} mut digits := []byte{}
mut x := n.clone() mut x := n.clone()
div := Number{}
for !x.is_zero() { for !x.is_zero() {
mod := divmod(&x, &big.ten, &div) // changes to reflect new api
div, mod := divmod(&x, &big.ten)
digits << byte(mod.int()) + `0` digits << byte(mod.int()) + `0`
x = div x = div
} }
@ -192,10 +193,13 @@ pub fn (a &Number) % (b &Number) Number {
return c return c
} }
pub fn divmod(a &Number, b &Number, c &Number) Number { // divmod returns a pair of quotient and remainder from div modulo operation
// between two bignums `a` and `b`
pub fn divmod(a &Number, b &Number) (Number, Number) {
c := Number{}
d := Number{} d := Number{}
C.bignum_divmod(a, b, c, &d) C.bignum_divmod(a, b, &c, &d)
return d return c, d
} }
// ////////////////////////////////////////////////////////// // //////////////////////////////////////////////////////////

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@ -90,6 +90,18 @@ fn test_mod() {
assert (big.from_u64(7) % big.from_u64(5)).int() == 2 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() { fn test_from_str() {
assert big.from_string('9870123').str() == '9870123' assert big.from_string('9870123').str() == '9870123'
assert big.from_string('').str() == '0' assert big.from_string('').str() == '0'