Function ExampleContext_RoundToIntegralExact

example_test.go:112–139

ExampleRoundToIntegralExact demonstrates how to use RoundToIntegralExact to check if a number is an integer or not. Note the variations between integer (which allows zeros after the decimal point) and strict (which does not). See the documentation on Inexact and Rounded.

()

// (which allows zeros after the decimal point) and strict (which does not). See
// the documentation on Inexact and Rounded.
func ExampleContext_RoundToIntegralExact() {
	inputs := []string{
		"123.4",
		"123.0",
		"123",
		"12E1",
		"120E-1",
		"120E-2",
	}
	for _, input := range inputs {
		d, _, _ := apd.NewFromString(input)
		res, _ := apd.BaseContext.RoundToIntegralExact(d, d)
		integer := !res.Inexact()
		strict := !res.Rounded()
		fmt.Printf("input: % 6s, output: %3s, integer: %5t, strict: %5t, res:", input, d, integer, strict)
		if res != 0 {
			fmt.Printf(" %s", res)
		}
		fmt.Println()
	}
	// Output:
	// input:  123.4, output: 123, integer: false, strict: false, res: inexact, rounded
	// input:  123.0, output: 123, integer:  true, strict: false, res: rounded
	// input:    123, output: 123, integer:  true, strict:  true, res:
	// input:   12E1, output: 120, integer:  true, strict:  true, res:
	// input: 120E-1, output:  12, integer:  true, strict: false, res: rounded
	// input: 120E-2, output:   1, integer: false, strict: false, res: inexact, rounded
}