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floor.go
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floor.go
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package math32
// Floor returns the greatest integer value less than or equal to x.
//
// Special cases are:
// Floor(±0) = ±0
// Floor(±Inf) = ±Inf
// Floor(NaN) = NaN
func Floor(x float32) float32 {
return floor(x)
}
func floor(x float32) float32 {
if x == 0 || IsNaN(x) || IsInf(x, 0) {
return x
}
if x < 0 {
d, fract := Modf(-x)
if fract != 0.0 {
d = d + 1
}
return -d
}
d, _ := Modf(x)
return d
}
// Ceil returns the least integer value greater than or equal to x.
//
// Special cases are:
// Ceil(±0) = ±0
// Ceil(±Inf) = ±Inf
// Ceil(NaN) = NaN
func Ceil(x float32) float32 {
return ceil(x)
}
func ceil(x float32) float32 {
return -Floor(-x)
}
// Trunc returns the integer value of x.
//
// Special cases are:
// Trunc(±0) = ±0
// Trunc(±Inf) = ±Inf
// Trunc(NaN) = NaN
func Trunc(x float32) float32 {
return trunc(x)
}
func trunc(x float32) float32 {
if x == 0 || IsNaN(x) || IsInf(x, 0) {
return x
}
d, _ := Modf(x)
return d
}