英文:
Evaluated but not used
问题
我不确定这里发生了什么。
我正在处理欧拉计划第8题，编写了以下函数来处理获取5个数字的乘积：
func fiveDigitProduct(n int) int {
localMax := n + 5
product := 1
for n; n < localMax; n++ {
f, _ := strconv.Atoi(input[n])
product *= f
}
return product
}
然而，我一直收到警告信息“n evaluated but not used”。我不知道为什么会发生这种情况。
英文:
I'm not sure what's happening here.
I'm working on Project Euler #8 and have come up with the following function to handle getting the product of 5 digits:
func fiveDigitProduct(n int) int {
localMax := n + 5
product := 1
for n; n < localMax; n++ {
f, _ := strconv.Atoi(input[n])
product *= f
}
return product
}
However, I keep getting the warning "n evaluated but not used". I have no idea why this is happening.
答案1
得分: 2
你的For语句的InitStmt（初始化语句）实际上没有进行任何初始化。你要求编译器评估n，但没有对其进行任何操作，这就是编译器抱怨的原因。由于你不需要为循环初始化n，只需这样做：
for ; n < localMax; n++ {
英文:
The InitStmt (initialization statement) of your For Statement isn't actually doing any initialization. You're asking the compiler to evaluate n but not do anything with it, which is what the compiler is complaining about. Since you don't need to initialize n for you loop, just do:
for ; n < localMax; n++ {
答案2
得分: 0
for循环的初始化部分和后置部分（其中你增加n的部分）需要是一个简单语句（只有“n”不是一个语句，它将是一个表达式，所以你尝试的语法是不正确的）。如果你将初始化部分设为n = n或n := n（在for循环的作用域内进行新的变量声明），它将是一个有效的语句并且可以工作。如上面的帖子所建议的，由于你不打算在初始化部分做任何事情，最好将其省略掉。
英文:
The initialization part of a for loop as also the post part (where you increment n) needs to be a simple statement (and just "n" is not a statement, it'll be an expression, so what you are trying to do is syntactically incorrect). If you make the init part n = n or n := n (a new variable declaration within the scope of the for loop), it'll be a valid statement and will work. As suggested in the above posts, since you don't intend to do anything in the init part it's best to leave it out.
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