Go language learning-package usage

Import a public package using import or a custom package similar to include in C. According to the tutorial, write a package that judges whether a number is an even number.

Run mkdir even in the current directory and enter the directory. Write the following code to VI even. Go:

package even func Even(a int ) bool {    state := false    if a%2 == 0 {        state=  true    }    return state}

Then write a test program:

package
main  import
"./even"  func
main() {      a:=
3      if
even.Even(a) {          println("is
even")      }else{          println("not
a even")      } }

Note: 1. Add even before the introduced even function; 2. the first letter of the function or variable for external use must be capitalized.

Go implements a stack:

package main  type stack struct {    top int     mLength int    data [10]int} func push(s *stack, key int ) {    if s.top +1 == 10{        return     }    s.data[s.top+1] = key    s.top ++    return } func pop(s *stack ) int {    if s.top == 0 {        return -1    }    key := s.data[s.top-1]     s.top --    return key} func get(s stack ) int {    if(s.top == 0){        return -1    }    return s.data[s.top-1]}   func main(){    var s stack    push(&s,25)    push(&s,14)    println(get(s)) }

Package format:

package stack type Stack struct {    top int     mLength int    data [10]int} func (s *Stack)Push( key int ) {    if s.top +1 == 10{        return     }    s.data[s.top+1] = key    s.top ++    return } func (s * Stack )Pop( ) int {    if s.top == 0 {        return -1    }    key := s.data[s.top-1]     s.top --    return key} func (s * Stack)Get( ) int {    if(s.top == 0){        return -1    }    return s.data[s.top-1]} 

Test_stack.go

package main  import "./stack" func main(){    var s stack.Stack    s.Push(1)    s.Push(2)    println(s.Get())}

Original blog address: http://www.fuxiang90.com/2012/08/go-%E8%AF%AD%E8%A8%80%E5%AD%A6%E4%B9%A0-%E5%8C%85%E7%9A%84%E7%94%A8%E6%B3%95/