diff options
Diffstat (limited to 'gsw_CH/gsw_CH.go')
-rw-r--r-- | gsw_CH/gsw_CH.go | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/gsw_CH/gsw_CH.go b/gsw_CH/gsw_CH.go index 7b147c6c..4ae64261 100644 --- a/gsw_CH/gsw_CH.go +++ b/gsw_CH/gsw_CH.go @@ -119,3 +119,40 @@ func (gsw *gsw_CH) FmtNumber(num float64, v uint64) []byte { return b } + +// FmtPercent returns 'num' with digits/precision of 'v' for 'gsw_CH' and handles both Whole and Real numbers based on 'v' +// returned as a []byte just in case the caller wishes to add more and can help +// avoid allocations; otherwise just cast as string. +// NOTE: 'num' passed into FmtPercent is assumed to be in percent already +func (gsw *gsw_CH) FmtPercent(num float64, v uint64) []byte { + + s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64) + l := len(s) + len(gsw.decimal) + + b := make([]byte, 0, l) + + for i := len(s) - 1; i >= 0; i-- { + + if s[i] == '.' { + b = append(b, gsw.decimal[0]) + continue + } + + b = append(b, s[i]) + } + + if num < 0 { + for j := len(gsw.minus) - 1; j >= 0; j-- { + b = append(b, gsw.minus[j]) + } + } + + // reverse + for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 { + b[i], b[j] = b[j], b[i] + } + + b = append(b, gsw.Percent[0]) + + return b +} |