go 语言命令行程序
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// lab3 project main.go
// minglinghang project main.go
package main import ( "fmt"
"math"
"os"
"strings"
"unsafe"
)
func add() { var firstNum, secondNum int
//fmt.Println("Please input two integers: ")
fmt.Scanln(&firstNum, &secondNum) fmt.Printf("%d + %d = %d\n", firstNum, secondNum, firstNum+secondNum)
}
func help() { ShowAllCommand(list) }
func sub() { var firstNum, secondNum int
//fmt.Println("Please input two integers: ")
fmt.Scanln(&firstNum, &secondNum) fmt.Printf("%d - %d = %d\n", firstNum, secondNum, firstNum-secondNum)
}
func mul() { var firstNum, secondNum int
//fmt.Println("Please input two integers: ")
fmt.Scanln(&firstNum, &secondNum) fmt.Printf("%d * %d = %d\n", firstNum, secondNum, firstNum*secondNum)
}
func div() { var firstNum, secondNum int
//fmt.Println("Please input two integers: ")
fmt.Scanln(&firstNum, &secondNum) fmt.Printf("%d / %d = %.2f\n", firstNum, secondNum, float64(firstNum)/float64(secondNum))
}
func pow() { var firstNum, secondNum int
//fmt.Println("Please input two integers: ")
fmt.Scanln(&firstNum, &secondNum) fmt.Printf("%d ^ %d = %.0f\n", firstNum, secondNum, math.Pow(float64(firstNum), float64(secondNum)))
}
func mod() { var firstNum, secondNum int
//fmt.Println("Please input two integers: ")
fmt.Scanln(&firstNum, &secondNum) fmt.Printf("%d mod %d = %d\n", firstNum, secondNum, firstNum%secondNum)
}
func quit() { os.Exit(1)
}
type DataNode struct {
next *DataNode cmd string
desc string
handler func()
}
type linknode struct {
next *linknode }
type linklist struct {
head *linknode tail *linknode }
func CreateLinklist() *linklist { return &linklist{}
}
func AddNode(list *linklist, newnode *linknode) { if list.head == nil {
list.head = newnode list.tail = list.head } else {
list.tail.next = newnode list.tail = newnode } }
func ShowAllCommand(list *linklist) { for node := list.head; node != nil; node = node.next {
tmp := (*DataNode)(unsafe.Pointer(node)) fmt.Printf("%s - %s\n", tmp.cmd, tmp.desc)
} }
func searchcondition(node *DataNode, cmd interface{}) bool {
str := cmd.(string)
//if strings.Compare(str, node.cmd) {
if node.cmd == str {
return true
} else {
return false
} }
func search(list *linklist, cmd string) *DataNode {
for node := list.head; node != nil; node = node.next {
tmp := (*DataNode)(unsafe.Pointer(node)) if searchcondition(tmp, cmd) {
return tmp
} } return (*DataNode)(unsafe.Pointer(list.head))
}
func Init(list *linklist) { menuconfig(list, "help", "this is help cmd", help)
menuconfig(list, "add", "this is add cmd", add)
menuconfig(list, "sub", "this is sub cmd", sub)
menuconfig(list, "mul", "this is mul cmd", mul)
menuconfig(list, "div", "this is div cmd", div)
menuconfig(list, "mod", "this is mod cmd", mod)
menuconfig(list, "pow", "this is pow cmd", pow)
menuconfig(list, "quit", "this is quit cmd", quit)
/*node := &DataNode{nil, "help", "this is help cmd", help}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node := &DataNode{nil, "add", "this is add cmd", add}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node = &DataNode{nil, "sub", "this is sub cmd", sub}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node = &DataNode{nil, "mul", "this is mul cmd", mul}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node = &DataNode{nil, "div", "this is div cmd", div}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node = &DataNode{nil, "mod", "this is mod cmd", mod}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node = &DataNode{nil, "pow", "this is pow cmd", pow}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
node = &DataNode{nil, "quit", "this is squit cmd", quit}
AddNode(list, (*linknode)(unsafe.Pointer(node)))
*/
}
func menuconfig(list *linklist, cmd string, desc string, handler func()) {
node := &DataNode{nil, cmd, desc, handler}
AddNode(list, (*linknode)(unsafe.Pointer(node))) }
const CMD_LENTH = 10
func Excutemenu(list *linklist) { for {
var argc int = 0
var cmdi string
var arg [5]string
fmt.Println("Input a cmd number >")
fmt.Scanf("%s", &cmdi)
var cmdis []string = strings.Split(cmdi, " ")
for (argc < len(cmdis)) && argc < CMD_LENTH {
arg[argc] = cmdis[argc] argc = argc + 1
} node := search(list, arg[0])
if node != nil {
node.handler() } else {
fmt.Printf("this is a wrong cmd ")
} } }
var list *linklist func main() { list = CreateLinklist() Init(list) Excutemenu(list) }
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