A Tour of Go Numeric Constants
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)) }
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(Small); var intVariable int = 1 //var float32Variable float32 = 1.2 fmt.Println(needInt(Small)) // constant 1267650600228229401496703205376 overflows int //fmt.Println(needInt(Big)) fmt.Println(needFloat(Small)) fmt.Println(needFloat(Big)) //go语言对类型的要求是很严格的,所以你不能传递int到float中或者float到int fmt.Println(needInt(intVariable)) //cannot use float32Variable (type float32) as type int in argument to needInt //fmt.Println(needInt(float32Variable)) //cannot use intVariable (type int) as type float64 in argument to needFloat //fmt.Println(needFloat(intVariable)) //cannot use float32Variable (type float32) as type float64 in argument to needFloat //fmt.Println(needFloat(float32Variable)) }
不过常量却相对宽容一些
//constant 1267650600228229401496703205376 overflows int fmt.Println(Big);
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