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math/big: added Float.Add example, remove warning from Floats

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Change-Id: If04840c34b0ac5168ce1699eae880f04ae21c84c
Reviewed-on: https://go-review.googlesource.com/6680
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Robert Griesemer 2015-03-03 13:41:56 -08:00
parent ef0b03137d
commit 0a8a625848
2 changed files with 18 additions and 5 deletions
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5
src/math/big/float.go
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@ -9,11 +9,6 @@
// rounding mode of the result operand determines the rounding
// mode of an operation. This is a from-scratch implementation.
// CAUTION: WORK IN PROGRESS - USE AT YOUR OWN RISK.
// TODO(gri) provide a couple of Example tests showing typical Float initialization
// and use.
package big
import (

18
src/math/big/floatexample_test.go
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@ -9,6 +9,24 @@ import (
"math/big"
)
// TODO(gri) add more examples
func ExampleFloat_Add() {
// Operating on numbers of different precision is easy.
var x, y, z big.Float
x.SetInt64(1000) // x is automatically set to 64bit precision
y.SetFloat64(2.718281828) // y is automatically set to 53bit precision
z.SetPrec(32)
z.Add(&x, &y)
fmt.Printf("x = %s (%s, prec = %d, acc = %s)\n", &x, x.Format('p', 0), x.Prec(), x.Acc())
fmt.Printf("y = %s (%s, prec = %d, acc = %s)\n", &y, y.Format('p', 0), y.Prec(), y.Acc())
fmt.Printf("z = %s (%s, prec = %d, acc = %s)\n", &z, z.Format('p', 0), z.Prec(), z.Acc())
// Output:
// x = 1000 (0x.fap10, prec = 64, acc = exact)
// y = 2.718281828 (0x.adf85458248cd8p2, prec = 53, acc = exact)
// z = 1002.718282 (0x.faadf854p10, prec = 32, acc = below)
}
func Example_Shift() {
// Implementing Float "shift" by modifying the (binary) exponents directly.
var x big.Float