GO base of the array

First, declare and iterate

main Package 

Import " FMT " 

// declare an array. 1 
var ARR [ . 3 ] int 
var arr2 is = [ . 4 ] int { . 1 , 2 , . 3 , . 4 } 

FUNC main () { 
    //     declare an array of 2 
    A: = [ . 4 ] float64 { 2.3 , . 4 , . 5 , 6.1 } 
    fmt.Println (A) 

    B: = [...] int { 2 , . 3 , . 4 }

    // iterate mode. 1 
    for I: = 0 ; I <len (A); I ++ { 
        fmt.Print (A [I], " \ T " ) 
    } 

    fmt.Println () 

    // iterate embodiment 2 
    for _, value: = Range B { 
        fmt.Print (value, " \ T " ) 
    } 

    // IF ARR nil == {
     //     fmt.Println ( "ARR == nil")
     // } 
    fmt.Print ( " \ n-traversal arr array: " )
     for _, value: = Range arr { 
        fmt.Print (value, " \ T")
    }
}

Arrays are passed by value

package main

import "fmt"

func main() {
    a := [...] string{"a" , "b" , "c" , "d"}
    b := a
    b[0] = "x"
    fmt.Println("a" , a)//[a b c d]
    fmt.Println("b" , b)//[x b c d]
}

Second, the two-dimensional array

In the two-dimensional array of two-dimensional concept, which is to say in both directions index change, the index variable position in the array is also in a plane, rather than just one-dimensional array as a vector. However, the actual hardware is consecutively addressed memory, i.e. memory cells are one-dimensional linear arrangement. How to store in the memory a two-dimensional array dimension, there are two ways: one is arranged in rows, i.e., is done sequentially into the second line after line. Another is arranged in columns, that is done after a re-placed in a second row sequentially.

In the GO language, the two-dimensional array are arranged in rows. That is, to store a [0] lines, and then stored a [1] line, and finally storing a [2] line. The elements in each row is sequentially stored.

1, a two-dimensional array of elements is also called a dual subscript variable, which represents the form of:
    array name [index] [index]
2, where the subscripts should be an integer constant or integer expression. For example:
      a [. 3] [. 4]: an array of elements representing a three rows and four columns.

package main

import "fmt"

func main() {
    var a = [5][3]int{ {1,2,3}, {4,5,6}, {7,8,9}, {10,11,12},{13,14,15}}

    for i:=0; i<len(a) ;i++  {
        for j:=0;j<len(a[0]) ;j++  {
            fmt.Printf("a[%d][%d]=%d\n"  , i , j , a[i][j])
        }
    }
}