rounder_example_test.go

Documentation: gopkg.in/inf.v0

     1  package inf_test
     2  
     3  import (
     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  //
    13  func 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
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