diff options
Diffstat (limited to 'src/pkg/strconv/decimal.go')
| -rw-r--r-- | src/pkg/strconv/decimal.go | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/src/pkg/strconv/decimal.go b/src/pkg/strconv/decimal.go index b3348512f..3be61d7bc 100644 --- a/src/pkg/strconv/decimal.go +++ b/src/pkg/strconv/decimal.go @@ -289,11 +289,11 @@ func (a *decimal) Shift(k int) *decimal { // If we chop a at nd digits, should we round up? func shouldRoundUp(a *decimal, nd int) bool { - if nd <= 0 || nd >= a.nd { + if nd < 0 || nd >= a.nd { return false } if a.d[nd] == '5' && nd+1 == a.nd { // exactly halfway - round to even - return (a.d[nd-1]-'0')%2 != 0 + return nd > 0 && (a.d[nd-1]-'0')%2 != 0 } // not halfway - digit tells all return a.d[nd] >= '5' @@ -301,8 +301,11 @@ func shouldRoundUp(a *decimal, nd int) bool { // Round a to nd digits (or fewer). // Returns receiver for convenience. +// If nd is zero, it means we're rounding +// just to the left of the digits, as in +// 0.09 -> 0.1. func (a *decimal) Round(nd int) *decimal { - if nd <= 0 || nd >= a.nd { + if nd < 0 || nd >= a.nd { return a } if shouldRoundUp(a, nd) { @@ -314,7 +317,7 @@ func (a *decimal) Round(nd int) *decimal { // Round a down to nd digits (or fewer). // Returns receiver for convenience. func (a *decimal) RoundDown(nd int) *decimal { - if nd <= 0 || nd >= a.nd { + if nd < 0 || nd >= a.nd { return a } a.nd = nd @@ -325,7 +328,7 @@ func (a *decimal) RoundDown(nd int) *decimal { // Round a up to nd digits (or fewer). // Returns receiver for convenience. func (a *decimal) RoundUp(nd int) *decimal { - if nd <= 0 || nd >= a.nd { + if nd < 0 || nd >= a.nd { return a } |