Numeric constants are high-precision values.
An untyped constant takes the type needed by its context.
Try printing needInt(Big) too.
package main import "fmt" const ( Big = 1 << 100 Small = Big >> 99 ) func needInt(x int) int { return x*10 + 1 } func needFloat(x float64) float64{ return x * 0.1 } func main() { fmt.Println(needInt(Small)) fmt.Println(needFloat(Small)) fmt.Println(needFloat(Big)) }
A Tour of Go Numeric Constants
原文：http://www.cnblogs.com/ghgyj/p/4052714.html