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golang 各个整数类型的 Max Min 值

The germane part:

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) 异或运算
const MinUint = 0 
const MaxInt = int(MaxUint >> 1)  干掉符号位
const MinInt = -MaxInt - 1 
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

From: https://stackoverflow.com/a/6878625/4830933

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