Compute absolute values

yourbasic.org/golang

Integers

Go has no built-in library function for computing the absolute value of an integer. It’s simple to write your own.

func Abs(x int32) int32 {
	if x < 0 {
		return -x
	}
	return x
}
Warning: The smallest value of a signed integer type doesn’t have a corresponding positive value. For example
  • math.MinInt32 equals -2147483648, while
  • math.MaxInt32 equals 2147483647.
There’s no good way to deal with this. In fact, Abs returns a negative value in this case.
fmt.Println(Abs(math.MinInt32)) // Output: -2147483648
The C and Java standard libraries also behave like this.

Floats

Use math.Abs to compute the absolute value of a floating-point number.

func Abs(x float64) float64

Note the special cases.

Abs(±Inf) = +Inf
Abs(NaN) = NaN

More code examples

Go blueprints: code for com­mon tasks is a collection of handy code examples.

Share this page: