day4 包 文件 作用域

pkg/MaxCommFactor/MaxCommFactor.go

@@ -0,0 +1,8 @@
+package MaxCommFactor
+
+func MaxComm(x, y int) int {
+	for y != 0 {
+		x, y = y, x%y
+	}
+	return x
+}

pkg/conv/conv.go

@@ -0,0 +1,7 @@
+package conv
+
+// CToF converts a Celsius temperature to Fahrenheit.
+func CToF(c Celsius) Fahrenheit { return Fahrenheit(c*9/5 + 32) }
+
+// FToC converts a Fahrenheit temperature to Celsius.
+func FToC(f Fahrenheit) Celsius { return Celsius((f - 32) * 5 / 9) }

pkg/conv/tempconv.go

@@ -0,0 +1,16 @@
+// Package conv performs Celsius and Fahrenheit conversions.
+package conv
+
+import "fmt"
+
+type Celsius float64
+type Fahrenheit float64
+
+const (
+	AbsoluteZeroC Celsius = -273.15
+	FreezingC     Celsius = 0
+	BoilingC      Celsius = 100
+)
+
+func (c Celsius) String() string    { return fmt.Sprintf("%g°C", c) }
+func (f Fahrenheit) String() string { return fmt.Sprintf("%g°F", f) }

src/study/day4/package.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"Study/pkg/MaxCommFactor"
+	"Study/pkg/conv"
+	"fmt"
+)
+
+func main() {
+	fmt.Println("AbsoluteZero:", conv.AbsoluteZeroC)
+
+	fmt.Println(conv.CToF(conv.BoilingC))
+	fmt.Println(MaxCommFactor.MaxComm(12, 24))
+}

src/study/day4/practice2.2.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"Study/pkg/MaxCommFactor"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	var nums []int
+	var x, y int
+	for _, arg := range os.Args[1:] {
+		t, err := strconv.ParseInt(arg, 0, 64)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "cf:", err)
+		}
+		nums = append(nums, int(t))
+	}
+	if len(nums) <= 0 {
+		fmt.Println("Please input two numbers in console (one in a row)")
+		fmt.Scanln(&x, &y)
+	} else if len(nums) == 1 {
+		x = nums[0] // 将终端输入的数据赋值给x
+		fmt.Println("Please input one numbers in console (one in a row)")
+		fmt.Scanln(&y)
+	} else {
+		x, y = nums[0], nums[1]
+	}
+	fmt.Print(x, y, " Gcd is ", MaxCommFactor.MaxComm(x, y))
+}

src/study/day4/scope.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main() {
+	x := "hello"
+	for _, x := range x {
+		x := x + 'A' - 'a'  // 将 for外部的x代入运算后 赋值给新局部变量x
+		fmt.Printf("%c", x) // "HELLO" (one letter per iteration)
+	}
+}