math 包基本用法

package main

import (
	"fmt"
	"math"
)

func main() {
	// 数学常数
	fmt.Printf("Pi: %v\n", math.Pi)
	fmt.Printf("E: %v\n", math.E)
	fmt.Printf("Phi (黄金比例): %v\n", math.Phi)

	// 极限值
	fmt.Printf("MaxFloat64: %v\n", math.MaxFloat64)
	fmt.Printf("SmallestNonzeroFloat64: %v\n", math.SmallestNonzeroFloat64)
	fmt.Printf("MaxInt: %v\n", math.MaxInt)
	fmt.Printf("MinInt: %v\n", math.MinInt)
}

package main

import (
	"fmt"
	"math"
)

func main() {
	// 绝对值
	fmt.Printf("Abs(-10) = %v\n", math.Abs(-10))

	// 取整
	fmt.Printf("Floor(3.7) = %v\n", math.Floor(3.7))
	fmt.Printf("Ceil(3.2) = %v\n", math.Ceil(3.2))
	fmt.Printf("Round(3.5) = %v\n", math.Round(3.5))
	fmt.Printf("Trunc(3.7) = %v\n", math.Trunc(3.7))

	// 最大最小值
	fmt.Printf("Max(5, 3) = %v\n", math.Max(5, 3))
	fmt.Printf("Min(5, 3) = %v\n", math.Min(5, 3))

	// 幂运算
	fmt.Printf("Pow(2, 10) = %v\n", math.Pow(2, 10))
	fmt.Printf("Sqrt(16) = %v\n", math.Sqrt(16))
	fmt.Printf("Cbrt(27) = %v\n", math.Cbrt(27))
}

package main

import (
	"fmt"
	"math"
)

func main() {
	// 角度转弧度
	degrees := 45.0
	radians := degrees * math.Pi / 180

	// 三角函数
	fmt.Printf("Sin(45°) = %v\n", math.Sin(radians))
	fmt.Printf("Cos(45°) = %v\n", math.Cos(radians))
	fmt.Printf("Tan(45°) = %v\n", math.Tan(radians))

	// 反三角函数
	sinValue := 0.7071067811865476
	fmt.Printf("Asin(0.707) = %v rad\n", math.Asin(sinValue))
	fmt.Printf("Asin(0.707) = %v°\n", math.Asin(sinValue)*180/math.Pi)
}

package main

import (
	"fmt"
	"math"
)

func main() {
	// 自然对数
	fmt.Printf("Log(E) = %v\n", math.Log(math.E))
	fmt.Printf("Log(10) = %v\n", math.Log(10))

	// 常用对数 (以10为底)
	fmt.Printf("Log10(100) = %v\n", math.Log10(100))

	// 以2为底的对数
	fmt.Printf("Log2(1024) = %v\n", math.Log2(1024))

	// 指数函数
	fmt.Printf("Exp(1) = %v\n", math.Exp(1))
	fmt.Printf("Exp(2) = %v\n", math.Exp(2))

	// 指数减1 (高精度)
	fmt.Printf("Expm1(0.001) = %v\n", math.Expm1(0.001))
}

package main

import (
	"fmt"
	"math"
)

func main() {
	// 判断特殊值
	fmt.Printf("IsNaN(NaN) = %v\n", math.IsNaN(math.NaN()))
	fmt.Printf("IsInf(+Inf, 1) = %v\n", math.IsInf(math.Inf(1), 1))
	fmt.Printf("IsInf(-Inf, -1) = %v\n", math.IsInf(math.Inf(-1), -1))

	// 无穷大
	fmt.Printf("Inf(1) = %v\n", math.Inf(1))
	fmt.Printf("Inf(-1) = %v\n", math.Inf(-1))

	// NaN
	fmt.Printf("NaN() = %v\n", math.NaN())

	// 符号函数
	fmt.Printf("Copysign(10, -1) = %v\n", math.Copysign(10, -1))
	fmt.Printf("Signbit(-10) = %v\n", math.Signbit(-10))
}