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big: added RatString, some simplifications

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R=rsc
CC=golang-dev
https://golang.org/cl/2095041
This commit is contained in:
Robert Griesemer 2010-08-31 15:18:46 -07:00
parent 3ad995ea88
commit 9f46962c3b
2 changed files with 19 additions and 14 deletions
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29
src/pkg/big/rat.go
View File

@ -269,29 +269,34 @@ func (z *Rat) SetString(s string) (*Rat, bool) {
}
// String returns a string representation of z in the form "a/b".
// String returns a string representation of z in the form "a/b" (even if b == 1).
func (z *Rat) String() string {
s := z.a.String()
if len(z.b) == 1 && z.b[0] == 1 {
return s
return z.a.String() + "/" + z.b.string(10)
}
// RatString returns a string representation of z in the form "a/b" if b != 1,
// and in the form "a" if b == 1.
func (z *Rat) RatString() string {
if z.IsInt() {
return z.a.String()
}
return s + "/" + z.b.string(10)
return z.String()
}
// FloatString returns a string representation of z in decimal form with prec
// digits of precision after the decimal point and the last digit rounded.
func (z *Rat) FloatString(prec int) string {
if z.IsInt() {
return z.a.String()
}
q, r := nat{}.div(nat{}, z.a.abs, z.b)
s := ""
s := q.string(10)
if z.a.neg {
s = "-"
}
s += q.string(10)
if len(z.b) == 1 && z.b[0] == 1 {
return s
s = "-" + s
}
p := nat{}.expNN(natTen, nat{Word(prec)}, nil)

4
src/pkg/big/rat_test.go
View File

@ -48,8 +48,8 @@ func TestRatSetString(t *testing.T) {
for i, test := range setStringTests {
x, ok := new(Rat).SetString(test.in)
if ok != test.ok || ok && x.String() != test.out {
t.Errorf("#%d got %s want %s", i, x.String(), test.out)
if ok != test.ok || ok && x.RatString() != test.out {
t.Errorf("#%d got %s want %s", i, x.RatString(), test.out)
}
}
}