英文:
New to GO, error with assignment inside condition
问题
我发现以下代码中的a和b在条件语句中被赋值，但未被使用：
package main
import "fmt"
//FizzBuzz n = 100
// Multiple of 3 output Fizz
//Multiple of 5 output Buzz
//Multiple of 3 and 5, FizzBuzz
func main(){
for i:=0; i<=100; i++{
a:= ""
b:= ""
if i%3 == 0 {
a:="Fizz"
}
if i%5 == 0{
b:="Buzz"
}
fmt.Println("number ",i,": ", a , b )
}
}
谢谢，
英文:
I get an error with the code below that a and b assigned within the conditions are unused:
package main
import "fmt"
//FizzBuzz n = 100
// Multiple of 3 output Fizz
//Multiple of 5 output Buzz
//Multiple of 3 and 5, FizzBuzz
func main(){
for i:=0; i<=100; i++{
a:= ""
b:= ""
if i%3 == 0 {
a:="Fizz"
}
if i%5 == 0{
b:="Buzz"
}
fmt.Println("number ",i,": ", a , b )
}
}
Thanks,
答案1
得分: 2
:= 在当前作用域中创建一个新变量。
a := ""
b := ""
if i%3 == 0 {
a := "Fizz" // 这创建了一个新的 "a"，它会遮蔽外部的 "a"，直到遇到 '}'
}
如果要进行赋值操作，请使用 =。
a := ""
b := ""
if i%3 == 0 {
a = "Fizz" // 原来的 "a" 被重新赋值
}
（对于 "b" 也是一样的）
英文:
:= creates a new variable in the current scope.
a := ""
b := ""
if i%3 == 0 {
a := "Fizz" // this creates a new "a", which shadows the outer "a" until the '}'
}
For assignment you want =.
a:= ""
b:= ""
if i%3 == 0 {
a = "Fizz" // the original "a" is re-assigned
}
(ditto for b)
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