floor.go

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
}