英文:
Using Go packages
问题
我不确定如何调用Go包。例如，如果我想创建随机数，我应该导入"math/rand"，但它不是"math"库的一部分吗？那么为什么这段代码不起作用：
package main
import(
"fmt"
"math"
)
func main(){
r := rand.New(rand.NewSource(99))
fmt.Println(r)
}
我的意思是，我不能通过直接导入一个超类（在这种情况下，只是"math"包）来访问随机函数吗？
英文:
I am not sure how Go packages are invoked. For example if I want to create random numbers I should import "math/random", but isn't it simply a part of the "math" library? So why doesn't this piece of code work:
package main
import(
"fmt"
"math"
)
func main(){
r := rand.New(rand.NewSource(99))
fmt.Println(r)
}
I mean, can't I just directly access the random functions by simply importing a superclass (in this case, simply the math "math" package)?
答案1
得分: 6
这是因为rand是一个独立的包，位于math包的层次结构下的math/rand包中，所以你需要单独导入它：
package main
import (
"fmt"
"math/rand"
)
func main() {
r := rand.New(rand.NewSource(99))
fmt.Println(r)
}
英文:
Thats because rand is a separate package that is hierarchically under the math package math/rand, so you have to import it specifically:
package main
import(
"fmt"
"math/rand"
)
func main(){
r := rand.New(rand.NewSource(99))
fmt.Println(r)
}
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