如何更改for循环的迭代器类型？

huangapple
go评论106阅读模式
英文:

How can I change the for loop iterator type?

问题

Go在默认情况下使用int作为迭代器，但我想要使用uint64。我无法找到一种方法来改变Go中for循环迭代器的类型。有没有一种方法可以在for语句中内联地进行更改？当我尝试在循环中执行一些操作，比如取模运算（%）时，默认的int类型会引起问题。

  1. func main() {
  2.     var val uint64 = 1234567890
  3.     for i := uint64(1); i < val; i += 2 {
  4.         if val%i == 0 {
  5.         }
  6.     }
  7. }

./q.go:7: invalid operation: i < val (mismatched types int and uint64)
./q.go:8: invalid operation: val % i (mismatched types uint64 and int)

英文:

Go uses int for the iterator by default from what I can tell, except I want uint64. I cannot figure out a way to change the type of for loop iterator in Go. Is there a way to do it inline with the for statement? The default type of int causes problems when I try to do something in the loop, like a mod operation (%).

  1. func main() {                                                                                                                               
  2.     var val uint64 = 1234567890                                                 
  3.     for i:=1; i&lt;val; i+=2 {  
  4.         if val%i==0 {
  5.         }                                        
  6.     }                                                                          
  7. } 
  9. ./q.go:7: invalid operation: i &lt; val (mismatched types int and uint64)
  10. ./q.go:8: invalid operation: val % i (mismatched types uint64 and int)

答案1

得分: 37

你是指像这样的吗？

  1. for i, val := uint64(1), uint64(1234567890); i<val; i+=2 {
  2.     // 你的模运算
  3. }

http://play.golang.org/p/yAdiJu4pNC

英文:

You mean something like this?

  1. for i, val := uint64(1), uint64(1234567890); i&lt;val; i+=2 {
  2.     // your modulus operation
  3. }

http://play.golang.org/p/yAdiJu4pNC

答案2

得分: 0

另一个选项是使用“while”循环：

  1. package main
  3. func main() {                                                                 
  4.    var i, val uint64 = 1, 1234567890
  5.    for i < val {
  6.       if val % i == 0 {
  7.          println(i)
  8.       }
  9.       i += 2
  10.    }                                                                          
  12. }

https://golang.org/ref/spec#For_condition

英文:

Another option is to use a "while" loop:

  1. package main
  3. func main() {                                                                 
  4.    var i, val uint64 = 1, 1234567890
  5.    for i &lt; val {
  6.       if val % i == 0 {
  7.          println(i)
  8.       }
  9.       i += 2
  10.    }                                                                          
  11. }

https://golang.org/ref/spec#For_condition

huangapple
  • 本文由 发表于 2013年2月23日 01:56:39
  • 转载请务必保留本文链接：https://go.coder-hub.com/15030327.html
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