loops - golang中的多重初始化

Question

在 id 之后的代码片段

package main

import "fmt"

var text []int64

func main() {

    for i, j := 0, 1; i < 4; i, j = i+1, j+1 {
        fmt.Println("Value of i, j:", i, j)
        fmt.Println(text[j])
    }

}

并且显示如下错误；

Value of i, j: 0 1
panic: runtime error: index out of range

goroutine 1 [running]:
main.main()
    /home/cg/root/6063741/main.go:13 +0x268
exit status 2

我想知道如何解决这个错误。

谢谢

这是我要转换为 go 的 java 代码；

long    text[]; 
int     num        = 1

text = new long[num];

for (int i=0; i<num; i++)
        {
            text[i] = 0;
        // do something
}
if (num > 1) {
            for (int i=0,j=1; i<numSubs; i++,j++) {
        // do something
        System.out.Println(text[i]
)
       }
}

Answer 1

The Go Programming Language Specification

Index expressions

For a slice a, a[x] denotes the element of the slice a indexed by x. The index x is in range if 0 <= x < len(a), otherwise it is out of range.

---

变量i和 j是 slice 的索引 text .它们必须始终在范围内:0 <= i < len(text)和 0 <= j < len(text) .自 i < j , 简化为 0 <= i和 j < len(text) .

对于您的 Go 示例，

package main

import "fmt"

var text []int64

func main() {
    for i, j := 0, 1; i < 4 && j < len(text); i, j = i+1, j+1 {
        fmt.Println("Value of i, j:", i, j)
        fmt.Println(text[j])
    }
}

Playground :https://play.golang.org/p/02r_VY9VMa5