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big: fix (*Rat) SetFrac64(a, b) when b < 0.
R=gri CC=golang-dev https://golang.org/cl/3352041
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@ -35,9 +35,8 @@ func (z *Rat) SetFrac(a, b *Int) *Rat {
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func (z *Rat) SetFrac64(a, b int64) *Rat {
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z.a.SetInt64(a)
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if b < 0 {
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z.b.setUint64(uint64(-b))
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b = -b
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z.a.neg = !z.a.neg
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return z.norm()
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}
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z.b = z.b.setUint64(uint64(b))
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return z.norm()
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@ -257,3 +257,26 @@ func TestIssue820(t *testing.T) {
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t.Errorf("got %s want %s", z, q)
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}
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}
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var setFrac64Tests = []struct {
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a, b int64
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out string
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}{
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{0, 1, "0"},
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{0, -1, "0"},
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{1, 1, "1"},
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{-1, 1, "-1"},
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{1, -1, "-1"},
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{-1, -1, "1"},
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{-9223372036854775808, -9223372036854775808, "1"},
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}
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func TestRatSetFrac64Rat(t *testing.T) {
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for i, test := range setFrac64Tests {
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x := new(Rat).SetFrac64(test.a, test.b)
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if x.RatString() != test.out {
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t.Errorf("#%d got %s want %s", i, x.RatString(), test.out)
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}
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}
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}
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