241 lines
3.7 KiB
Go
241 lines
3.7 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package math_test
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
)
|
|
|
|
func ExampleAcos() {
|
|
fmt.Printf("%.2f", math.Acos(1))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleAcosh() {
|
|
fmt.Printf("%.2f", math.Acosh(1))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleAsin() {
|
|
fmt.Printf("%.2f", math.Asin(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleAsinh() {
|
|
fmt.Printf("%.2f", math.Asinh(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleAtan() {
|
|
fmt.Printf("%.2f", math.Atan(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleAtan2() {
|
|
fmt.Printf("%.2f", math.Atan2(0, 0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleAtanh() {
|
|
fmt.Printf("%.2f", math.Atanh(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleCopysign() {
|
|
fmt.Printf("%.2f", math.Copysign(3.2, -1))
|
|
// Output: -3.20
|
|
}
|
|
|
|
func ExampleCos() {
|
|
fmt.Printf("%.2f", math.Cos(math.Pi/2))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleCosh() {
|
|
fmt.Printf("%.2f", math.Cosh(0))
|
|
// Output: 1.00
|
|
}
|
|
|
|
func ExampleSin() {
|
|
fmt.Printf("%.2f", math.Sin(math.Pi))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleSincos() {
|
|
sin, cos := math.Sincos(0)
|
|
fmt.Printf("%.2f, %.2f", sin, cos)
|
|
// Output: 0.00, 1.00
|
|
}
|
|
|
|
func ExampleSinh() {
|
|
fmt.Printf("%.2f", math.Sinh(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleTan() {
|
|
fmt.Printf("%.2f", math.Tan(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleTanh() {
|
|
fmt.Printf("%.2f", math.Tanh(0))
|
|
// Output: 0.00
|
|
}
|
|
|
|
func ExampleSqrt() {
|
|
const (
|
|
a = 3
|
|
b = 4
|
|
)
|
|
c := math.Sqrt(a*a + b*b)
|
|
fmt.Printf("%.1f", c)
|
|
// Output: 5.0
|
|
}
|
|
|
|
func ExampleCeil() {
|
|
c := math.Ceil(1.49)
|
|
fmt.Printf("%.1f", c)
|
|
// Output: 2.0
|
|
}
|
|
|
|
func ExampleFloor() {
|
|
c := math.Floor(1.51)
|
|
fmt.Printf("%.1f", c)
|
|
// Output: 1.0
|
|
}
|
|
|
|
func ExamplePow() {
|
|
c := math.Pow(2, 3)
|
|
fmt.Printf("%.1f", c)
|
|
// Output: 8.0
|
|
}
|
|
|
|
func ExamplePow10() {
|
|
c := math.Pow10(2)
|
|
fmt.Printf("%.1f", c)
|
|
// Output: 100.0
|
|
}
|
|
|
|
func ExampleRound() {
|
|
p := math.Round(10.5)
|
|
fmt.Printf("%.1f\n", p)
|
|
|
|
n := math.Round(-10.5)
|
|
fmt.Printf("%.1f\n", n)
|
|
// Output:
|
|
// 11.0
|
|
// -11.0
|
|
}
|
|
|
|
func ExampleRoundToEven() {
|
|
u := math.RoundToEven(11.5)
|
|
fmt.Printf("%.1f\n", u)
|
|
|
|
d := math.RoundToEven(12.5)
|
|
fmt.Printf("%.1f\n", d)
|
|
// Output:
|
|
// 12.0
|
|
// 12.0
|
|
}
|
|
|
|
func ExampleLog() {
|
|
x := math.Log(1)
|
|
fmt.Printf("%.1f\n", x)
|
|
|
|
y := math.Log(2.7183)
|
|
fmt.Printf("%.1f\n", y)
|
|
// Output:
|
|
// 0.0
|
|
// 1.0
|
|
}
|
|
|
|
func ExampleLog2() {
|
|
fmt.Printf("%.1f", math.Log2(256))
|
|
// Output: 8.0
|
|
}
|
|
|
|
func ExampleLog10() {
|
|
fmt.Printf("%.1f", math.Log10(100))
|
|
// Output: 2.0
|
|
}
|
|
|
|
func ExampleMod() {
|
|
c := math.Mod(7, 4)
|
|
fmt.Printf("%.1f", c)
|
|
// Output: 3.0
|
|
}
|
|
|
|
func ExampleAbs() {
|
|
x := math.Abs(-2)
|
|
fmt.Printf("%.1f\n", x)
|
|
|
|
y := math.Abs(2)
|
|
fmt.Printf("%.1f\n", y)
|
|
// Output:
|
|
// 2.0
|
|
// 2.0
|
|
}
|
|
func ExampleDim() {
|
|
fmt.Printf("%.2f\n", math.Dim(4, -2))
|
|
fmt.Printf("%.2f\n", math.Dim(-4, 2))
|
|
// Output:
|
|
// 6.00
|
|
// 0.00
|
|
}
|
|
|
|
func ExampleExp() {
|
|
fmt.Printf("%.2f\n", math.Exp(1))
|
|
fmt.Printf("%.2f\n", math.Exp(2))
|
|
fmt.Printf("%.2f\n", math.Exp(-1))
|
|
// Output:
|
|
// 2.72
|
|
// 7.39
|
|
// 0.37
|
|
}
|
|
|
|
func ExampleExp2() {
|
|
fmt.Printf("%.2f\n", math.Exp2(1))
|
|
fmt.Printf("%.2f\n", math.Exp2(-3))
|
|
// Output:
|
|
// 2.00
|
|
// 0.12
|
|
}
|
|
|
|
func ExampleExpm1() {
|
|
fmt.Printf("%.6f\n", math.Expm1(0.01))
|
|
fmt.Printf("%.6f\n", math.Expm1(-1))
|
|
// Output:
|
|
// 0.010050
|
|
// -0.632121
|
|
}
|
|
|
|
func ExampleTrunc() {
|
|
fmt.Printf("%.2f\n", math.Trunc(math.Pi))
|
|
fmt.Printf("%.2f\n", math.Trunc(-1.2345))
|
|
// Output:
|
|
// 3.00
|
|
// -1.00
|
|
}
|
|
|
|
func ExampleCbrt() {
|
|
fmt.Printf("%.2f\n", math.Cbrt(8))
|
|
fmt.Printf("%.2f\n", math.Cbrt(27))
|
|
// Output:
|
|
// 2.00
|
|
// 3.00
|
|
}
|
|
|
|
func ExampleModf() {
|
|
int, frac := math.Modf(3.14)
|
|
fmt.Printf("%.2f, %.2f\n", int, frac)
|
|
|
|
int, frac = math.Modf(-2.71)
|
|
fmt.Printf("%.2f, %.2f\n", int, frac)
|
|
// Output:
|
|
// 3.00, 0.14
|
|
// -2.00, -0.71
|
|
}
|