doujinai2183 2018-12-25 17:41
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使用uint64的for循环不会停止

Is there an explanation why for loop using uint64 wouldn't stop at 0?

I've tried the same for loop with int and it works as expected.

package main

import (
    "fmt"
)

func main() {
  i := uint64(5)
  for ; i>=uint64(0); i-- {
  fmt.Printf("step %d
", i)
  }
}

I would expect this function to stop at output step 0 but it overflows the int and continues forever with step 18446744073709551615 and so on

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1条回答 默认 最新

  • duanruinong0619 2018-12-25 17:45
    关注

    Your loop continues while i >= 0, but an unsigned integer is always greater than or equal to zero. Unsigned integers cannot be negative so your loop never terminates.

    Try changing i to int64 and see if it behaves differently. :-)

    Best of luck.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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