How to change 12345
to 54321
?
With a string, you can change the string to a rune
, and reverse it, but you cannot do the same for an integer. I have searched and found no one talking about this. Examples131415
>>> 514131
1357
>>> 7531
123a
>>> ERROR
-EDIT-
I was thinking, why not create a slice
and index that?
Then I realized that you can't index int
(http://play.golang.org/p/SUSg04tZsc)
MY NEW QUESTION IS
How do you index an int?
OR
How do you reverse a int?
反向int golang
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3条回答 默认 最新
- duancoubeng5909 2016-03-13 18:01关注
Here is a solution that does not use indexing an
int
package main import ( "fmt" ) func reverse_int(n int) int { new_int := 0 for n > 0 { remainder := n % 10 new_int *= 10 new_int += remainder n /= 10 } return new_int } func main() { fmt.Println(reverse_int(123456)) fmt.Println(reverse_int(100)) fmt.Println(reverse_int(1001)) fmt.Println(reverse_int(131415)) fmt.Println(reverse_int(1357)) }
Result:
654321 1 1001 514131 7531
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