Go (golang) Tutorials - Arrays and Array of Pointers

Published: 24 March 2018
on channel: Ambasoft Java

498

#golang #go #arrays

Arrays
-------
1.Array Declaration - var a [3]int
2.Array Declare and assign (initialize) - b:= [5]int{2,4,6,8,10}
3.Array Declaration without Size - c:=[...]int{10,20,30,40,506,70,80,90,100}
4.Array Initialize with specific elements - d:=[4]int{1:30}
5.Array of Pointers - a:=[5]*int{0:new(int),1:new(int)}
Pointers are variables used to point the address of another variable. Using pointers we can access both value and address of a variable
Wehenver we want to access a value using a pointer, we need to use "*" with the pointer variable
6.Assigning/Copying Arrays
7.Assigning/Copying Array of Pointers
8.Multi-Dimensional Arrays
9.Passing Arrays to Functions

arraydemo.go
------------
package main
import "fmt"
func main(){
var a [3]int //Declaring variable a as an array of size 3 belongs to data type integer
//Integer variables defaulted to Zero, String will be defaulted to "" and Objects will be defaulted nil
a[0]=10;
a[1]=20;
a[2]=30;

b:= [5]int{2,4,6,8,10} //Initialization of Arrays
c:=[...]int{10,20,30,40,506,70,80,90,100} //Used to identify the array dimension based on the initialization values
d:=[4]int{1:30} //Initialize array variable d of integer, size [3] with value 30 on its a[1] index
fmt.Printf("The size of array c is %d\n",len(c))
a=d //Copying or assigning arrays is possible only if the data type and dimension of both the arrays are alike
//Use for loop to print array values as shown in the video
}

arraypointersdemo.go
--------------------
package main
import "fmt"
func main(){
var b [5]*int

a:=[5]*int{0:new(int),1:new(int)} //Initializing only th first two locations of the pointer array to two integer pointers,rest of the indices left nil
*a[0]=100 //pointer a[0] will store value 100
*a[1]=200 //Pointer a[1] will store value 200
//Use For loop
fmt.Println(*a[i]) //a[0] is pointing to value 100 whereas a[1] is poiting to value 200
b=a //Copy Array of Pointers not the values. Both the pointers will start pointing to the same set of values
//Use For loop
fmt.Println(*b[i]) //b[0] is pointing to value 100 whereas b[1] is pointing to value 200
}

multiarraydemo.go
-------------------
package main
import "fmt"
func main(){
var a [2][2]int //Two Dimensional array of two rows and two columns
b:=[2][2]int{{10,20},{30,40}}
a=b //Copying Two Dimesional Array
//Use nested For loops to iterate
fmt.Printf("A=%d, B=%d",a[i][j],b[i][j])
}

funcarraydemo.go
----------------
package main
import "fmt"
func main(){
a:=[2]string{"One","two"}
displayarray(a) //Passing Array to function
}

func displayarray(x [2]string){
//Use for loop as in the video
fmt.Println(x[i])

}

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