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big: more explicit documentation for div/mod/quo/rem

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Fixes #2380.

R=rsc, rogpeppe
CC=golang-dev
https://golang.org/cl/5313041
This commit is contained in:
Robert Griesemer 2011-10-18 09:45:38 -07:00
parent 4e7aac5413
commit 1db31f8933
1 changed files with 4 additions and 4 deletions
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8
src/pkg/big/int.go
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@ -163,7 +163,7 @@ func (z *Int) Binomial(n, k int64) *Int {
// Quo sets z to the quotient x/y for y != 0 and returns z.
// If y == 0, a division-by-zero run-time panic occurs.
// See QuoRem for more details.
// Quo implements truncated division (like Go); see QuoRem for more details.
func (z *Int) Quo(x, y *Int) *Int {
z.abs, _ = z.abs.div(nil, x.abs, y.abs)
z.neg = len(z.abs) > 0 && x.neg != y.neg // 0 has no sign
@ -172,7 +172,7 @@ func (z *Int) Quo(x, y *Int) *Int {
// Rem sets z to the remainder x%y for y != 0 and returns z.
// If y == 0, a division-by-zero run-time panic occurs.
// See QuoRem for more details.
// Rem implements truncated modulus (like Go); see QuoRem for more details.
func (z *Int) Rem(x, y *Int) *Int {
_, z.abs = nat(nil).div(z.abs, x.abs, y.abs)
z.neg = len(z.abs) > 0 && x.neg // 0 has no sign
@ -198,7 +198,7 @@ func (z *Int) QuoRem(x, y, r *Int) (*Int, *Int) {
// Div sets z to the quotient x/y for y != 0 and returns z.
// If y == 0, a division-by-zero run-time panic occurs.
// See DivMod for more details.
// Div implements Euclidean division (unlike Go); see DivMod for more details.
func (z *Int) Div(x, y *Int) *Int {
y_neg := y.neg // z may be an alias for y
var r Int
@ -215,7 +215,7 @@ func (z *Int) Div(x, y *Int) *Int {
// Mod sets z to the modulus x%y for y != 0 and returns z.
// If y == 0, a division-by-zero run-time panic occurs.
// See DivMod for more details.
// Mod implements Euclidean modulus (unlike Go); see DivMod for more details.
func (z *Int) Mod(x, y *Int) *Int {
y0 := y // save y
if z == y || alias(z.abs, y.abs) {