1package inf_test
2
3import (
4	"fmt"
5	"os"
6	"text/tabwriter"
7
8	"gopkg.in/inf.v0"
9)
10
11// This example displays the results of Dec.Round with each of the Rounders.
12//
13func ExampleRounder() {
14	var vals = []struct {
15		x string
16		s inf.Scale
17	}{
18		{"-0.18", 1}, {"-0.15", 1}, {"-0.12", 1}, {"-0.10", 1},
19		{"-0.08", 1}, {"-0.05", 1}, {"-0.02", 1}, {"0.00", 1},
20		{"0.02", 1}, {"0.05", 1}, {"0.08", 1}, {"0.10", 1},
21		{"0.12", 1}, {"0.15", 1}, {"0.18", 1},
22	}
23
24	var rounders = []struct {
25		name    string
26		rounder inf.Rounder
27	}{
28		{"RoundDown", inf.RoundDown}, {"RoundUp", inf.RoundUp},
29		{"RoundCeil", inf.RoundCeil}, {"RoundFloor", inf.RoundFloor},
30		{"RoundHalfDown", inf.RoundHalfDown}, {"RoundHalfUp", inf.RoundHalfUp},
31		{"RoundHalfEven", inf.RoundHalfEven}, {"RoundExact", inf.RoundExact},
32	}
33
34	fmt.Println("The results of new(inf.Dec).Round(x, s, inf.RoundXXX):")
35	fmt.Println()
36	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', tabwriter.AlignRight)
37	fmt.Fprint(w, "x\ts\t|\t")
38	for _, r := range rounders {
39		fmt.Fprintf(w, "%s\t", r.name[5:])
40	}
41	fmt.Fprintln(w)
42	for _, v := range vals {
43		fmt.Fprintf(w, "%s\t%d\t|\t", v.x, v.s)
44		for _, r := range rounders {
45			x, _ := new(inf.Dec).SetString(v.x)
46			z := new(inf.Dec).Round(x, v.s, r.rounder)
47			fmt.Fprintf(w, "%d\t", z)
48		}
49		fmt.Fprintln(w)
50	}
51	w.Flush()
52
53	// Output:
54	// The results of new(inf.Dec).Round(x, s, inf.RoundXXX):
55	//
56	//      x s | Down   Up Ceil Floor HalfDown HalfUp HalfEven Exact
57	//  -0.18 1 | -0.1 -0.2 -0.1  -0.2     -0.2   -0.2     -0.2 <nil>
58	//  -0.15 1 | -0.1 -0.2 -0.1  -0.2     -0.1   -0.2     -0.2 <nil>
59	//  -0.12 1 | -0.1 -0.2 -0.1  -0.2     -0.1   -0.1     -0.1 <nil>
60	//  -0.10 1 | -0.1 -0.1 -0.1  -0.1     -0.1   -0.1     -0.1  -0.1
61	//  -0.08 1 |  0.0 -0.1  0.0  -0.1     -0.1   -0.1     -0.1 <nil>
62	//  -0.05 1 |  0.0 -0.1  0.0  -0.1      0.0   -0.1      0.0 <nil>
63	//  -0.02 1 |  0.0 -0.1  0.0  -0.1      0.0    0.0      0.0 <nil>
64	//   0.00 1 |  0.0  0.0  0.0   0.0      0.0    0.0      0.0   0.0
65	//   0.02 1 |  0.0  0.1  0.1   0.0      0.0    0.0      0.0 <nil>
66	//   0.05 1 |  0.0  0.1  0.1   0.0      0.0    0.1      0.0 <nil>
67	//   0.08 1 |  0.0  0.1  0.1   0.0      0.1    0.1      0.1 <nil>
68	//   0.10 1 |  0.1  0.1  0.1   0.1      0.1    0.1      0.1   0.1
69	//   0.12 1 |  0.1  0.2  0.2   0.1      0.1    0.1      0.1 <nil>
70	//   0.15 1 |  0.1  0.2  0.2   0.1      0.1    0.2      0.2 <nil>
71	//   0.18 1 |  0.1  0.2  0.2   0.1      0.2    0.2      0.2 <nil>
72
73}
74