Go 中 int 类型的最大值 [英] The maximum value for an int type in Go

问题描述

如何指定 unsigned 整数类型可表示的最大值?

How does one specify the maximum value representable for an unsigned integer type?

我想知道如何在下面的循环中初始化 min 以迭代计算某些结构的最小和最大长度.

I would like to know how to initialize min in the loop below that iteratively computes min and max lengths from some structs.

var minLen uint = ???
var maxLen uint = 0
for _, thing := range sliceOfThings {
  if minLen > thing.n { minLen = thing.n }
  if maxLen < thing.n { maxLen = thing.n }
}
if minLen > maxLen {
  // If there are no values, clamp min at 0 so that min <= max.
  minLen = 0
}

这样第一次通过比较，minLen >= n.

so that the first time through the comparison, minLen >= n.

推荐答案

https://groups.google.com/group/golang-nuts/msg/71c307e4d73024ce?pli=1

密切相关的部分:

由于整数类型使用二进制补码算法，您可以推断int 和 uint 的最小/最大常量值.例如，

Since integer types use two's complement arithmetic, you can infer the min/max constant values for int and uint. For example,

const MaxUint = ^uint(0) 
const MinUint = 0 
const MaxInt = int(MaxUint >> 1) 
const MinInt = -MaxInt - 1

根据@CarelZA 的评论:

As per @CarelZA's comment:

uint8  : 0 to 255 
uint16 : 0 to 65535 
uint32 : 0 to 4294967295 
uint64 : 0 to 18446744073709551615 
int8   : -128 to 127 
int16  : -32768 to 32767 
int32  : -2147483648 to 2147483647 
int64  : -9223372036854775808 to 9223372036854775807

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