英文:
Iterating through multi dimensional array in Go
问题
在下面的代码示例中：
var a [3][5]int8
for _, h := range a {
for _, cell := range h {
fmt.Print(cell, " ")
}
fmt.Println()
}
在每次迭代中，h 是否是 a 的一行的副本？也就是说，h 是否包含 a 的一行的副本，还是 h 获取了对它的引用？
英文:
In the following code example
var a [3][5]int8
for _, h := range a {
for _, cell := range h {
fmt.Print(cell, " ")
}
fmt.Println()
}
is the copy of a row of a made in every iteration? i.e., does h contain a copy of a row of a or does h get a reference to it?
答案1
得分: 6
一个示例代码如下：
package main
import "fmt"
func main() {
var a [3][5]int8
fmt.Println(a)
for _, h := range a {
h = [5]int8{1, 2, 3, 4, 5}
for _, cell := range h {
fmt.Print(cell, " ")
}
fmt.Println()
}
fmt.Println(a)
}
输出结果：
[[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
[[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]
这段代码使用了Go语言中的range关键字来遍历一个二维数组a。在每次迭代中，将迭代的值赋给对应的迭代变量h，然后执行相应的代码块。输出结果显示了数组的初始值和经过赋值后的结果。
你可以参考Go语言规范中的For语句部分了解更多关于range关键字的用法。
英文:
A copy. For example,
package main
import "fmt"
func main() {
var a [3][5]int8
fmt.Println(a)
for _, h := range a {
h = [5]int8{1, 2, 3, 4, 5}
for _, cell := range h {
fmt.Print(cell, " ")
}
fmt.Println()
}
fmt.Println(a)
}
Output:
[[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
[[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]]
> The Go Programming Language Specification
>
> For statements
>
> A "for" statement with a "range" clause iterates through all entries
> of an array, slice, string or map, or values received on a channel.
> For each entry it assigns iteration values to corresponding iteration
> variables and then executes the block.
>
> The iteration values are assigned to the respective iteration
> variables as in an assignment statement.
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