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package main
import "fmt"
func main() {
// create an array a that will hold exactly 5 ints.
// The type of elements and length are both part of the
// array's type. By default an array is zero-valued.
var a [5]int
fmt.Println("emp:", a)
// we can set a value at an index using the array[index] = value syntax
// and get a value with array[index]
a[4] = 100
fmt.Println("set:", a)
fmt.Println("get:", a[4])
// the builtin len returns the length of an array
fmt.Println("len:", len(a))
// Use this syntax to declare and initialize an array in one line
b := [5]int{1, 2, 3, 4, 5}
fmt.Println("dcl:", b)
// you can also have the compiler count the number of elements for you with ...
b = [...]int{1, 2, 3, 4, 5}
fmt.Println("dcl:", b)
// if you specify the index with :, the elements in between will be zeroed
b = [...]int{100, 3: 400, 500}
fmt.Println("dcl:", b)
// Array types are one-dimensional, but you can compose types to
// build multi-dimensional data structures.
var twoD [2][3]int
for i := 0; i < 2; i++ {
for j := 0; j < 3; j++ {
twoD[i][j] = i + j
}
}
fmt.Println("2d: ", twoD)
// you can create and initialize multi-dimensional arrays at once too
twoD = [2][3]int{
{1, 2, 3},
{3, 4, 5},
}
fmt.Println("2d: ", twoD)
}
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