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Coder0yangCoder0yang
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Init the repo
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50 files changed

+643
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‎array/slices1

1.57 MB
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‎array/slices1.go

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package main
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import "fmt"
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func main(){
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var arr1 [5]int
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for i:=0; i<len(arr1); i++ {
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arr1[i] = i * 2
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}
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for i:=0; i<len(arr1); i++{
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fmt.Printf("Array at index %d is %d\n",i,arr1[i])
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}
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}

‎array/slices2.go

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package main
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import "fmt"
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func main(){
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seasons := []string{"Spring","Summer","Autumn","Winter"}
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for ix,season := range seasons{
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fmt.Printf("season %d is: %s\n",ix,season)
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}
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var season string
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for _,season = range seasons{
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fmt.Printf("%s\n",season)
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}
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}

‎bitoper/bitop.go

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package main
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import "fmt"
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func main(){
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a := 1
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a = a << 1
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a = a << 2
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fmt.Println(a)
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}

‎calcproj/bin/calc

1.57 MB
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‎calcproj/pkg/linux_amd64/simplemath.a

1.43 KB
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‎calcproj/src/calc/calc.go

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package main
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import "os"
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import "fmt"
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import "simplemath"
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import "strconv"
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var Usage = func() {
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fmt.Println("USAGE: calc command [arguments] ...")
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fmt.Println("\nThe commands are:\n\tadd\tAddition of two values.\n\tsqrt\tSquare root of a non-negative value.")
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}
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func main() {
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args := os.Args
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if args == nil || len(args) < 2 {
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Usage()
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return
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}
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switch args[1] {
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case "add":
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if len(args) != 4 {
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fmt.Println("USAGE: calc add <integer1><integer2>")
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return
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}
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v1, err1 := strconv.Atoi(args[2])
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v2, err2 := strconv.Atoi(args[3])
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if err1 != nil || err2 != nil {
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fmt.Println("USAGE: calc add <integer1><integer2>")
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return
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}
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ret := simplemath.Add(v1, v2)
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fmt.Println("Result: ", ret)
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case "sqrt":
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if len(args) != 3 {
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fmt.Println("USAGE: calc sqrt <integer>")
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return
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}
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v, err := strconv.Atoi(args[2])
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if err != nil {
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fmt.Println("USAGE: calc sqrt <integer>")
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return
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}
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ret := simplemath.Sqrt(v)
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fmt.Println("Result: ", ret)
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default:
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Usage()
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}
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}

‎calcproj/src/simplemath/add.go

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package simplemath
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func Add(a int, b int) int {
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return a + b
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}

‎calcproj/src/simplemath/add_test.go

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package simplemath
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import "testing"
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func TestAdd1(t *testing.T) {
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r := Add(1, 2)
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if r != 3 {
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t.Errorf("Add(1,2 failed. Got %d,expected 3.)", r)
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}
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}
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func BenchmarkAdd(b *testing.B){
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for i:=0;i<b.N;i++{
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Add(1,2)
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}
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}

‎calcproj/src/simplemath/sqrt.go

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package simplemath
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import "math"
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func Sqrt(i int) int {
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v := math.Sqrt(float64(i))
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return int(v)
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}

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