libgo/go/math/example_test.go

   1 // Copyright 2017 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package math_test
   6
   7 import (
   8         "fmt"
   9         "math"
  10 )
  11
  12 func ExampleAcos() {
  13         fmt.Printf("%.2f", math.Acos(1))
  14         // Output: 0.00
  15 }
  16
  17 func ExampleAcosh() {
  18         fmt.Printf("%.2f", math.Acosh(1))
  19         // Output: 0.00
  20 }
  21
  22 func ExampleAsin() {
  23         fmt.Printf("%.2f", math.Asin(0))
  24         // Output: 0.00
  25 }
  26
  27 func ExampleAsinh() {
  28         fmt.Printf("%.2f", math.Asinh(0))
  29         // Output: 0.00
  30 }
  31
  32 func ExampleAtan() {
  33         fmt.Printf("%.2f", math.Atan(0))
  34         // Output: 0.00
  35 }
  36
  37 func ExampleAtan2() {
  38         fmt.Printf("%.2f", math.Atan2(0, 0))
  39         // Output: 0.00
  40 }
  41
  42 func ExampleAtanh() {
  43         fmt.Printf("%.2f", math.Atanh(0))
  44         // Output: 0.00
  45 }
  46
  47 func ExampleCos() {
  48         fmt.Printf("%.2f", math.Cos(math.Pi/2))
  49         // Output: 0.00
  50 }
  51
  52 func ExampleCosh() {
  53         fmt.Printf("%.2f", math.Cosh(0))
  54         // Output: 1.00
  55 }
  56
  57 func ExampleSin() {
  58         fmt.Printf("%.2f", math.Sin(math.Pi))
  59         // Output: 0.00
  60 }
  61
  62 func ExampleSincos() {
  63         sin, cos := math.Sincos(0)
  64         fmt.Printf("%.2f, %.2f", sin, cos)
  65         // Output: 0.00, 1.00
  66 }
  67
  68 func ExampleSinh() {
  69         fmt.Printf("%.2f", math.Sinh(0))
  70         // Output: 0.00
  71 }
  72
  73 func ExampleTan() {
  74         fmt.Printf("%.2f", math.Tan(0))
  75         // Output: 0.00
  76 }
  77
  78 func ExampleTanh() {
  79         fmt.Printf("%.2f", math.Tanh(0))
  80         // Output: 0.00
  81 }
  82
  83 func ExampleSqrt() {
  84         const (
  85                 a = 3
  86                 b = 4
  87         )
  88         c := math.Sqrt(a*a + b*b)
  89         fmt.Printf("%.1f", c)
  90         // Output: 5.0
  91 }
  92
  93 func ExampleCeil() {
  94         c := math.Ceil(1.49)
  95         fmt.Printf("%.1f", c)
  96         // Output: 2.0
  97 }
  98
  99 func ExampleFloor() {
 100         c := math.Floor(1.51)
 101         fmt.Printf("%.1f", c)
 102         // Output: 1.0
 103 }
 104
 105 func ExamplePow() {
 106         c := math.Pow(2, 3)
 107         fmt.Printf("%.1f", c)
 108         // Output: 8.0
 109 }
 110
 111 func ExamplePow10() {
 112         c := math.Pow10(2)
 113         fmt.Printf("%.1f", c)
 114         // Output: 100.0
 115 }
 116
 117 func ExampleRound() {
 118         p := math.Round(10.5)
 119         fmt.Printf("%.1f\n", p)
 120
 121         n := math.Round(-10.5)
 122         fmt.Printf("%.1f\n", n)
 123         // Output:
 124         // 11.0
 125         // -11.0
 126 }
 127
 128 func ExampleRoundToEven() {
 129         u := math.RoundToEven(11.5)
 130         fmt.Printf("%.1f\n", u)
 131
 132         d := math.RoundToEven(12.5)
 133         fmt.Printf("%.1f\n", d)
 134         // Output:
 135         // 12.0
 136         // 12.0
 137 }