是什么导致语法错误? [英] What is causing the syntax error here?

问题描述

我正在尝试实现此算法，但是在第12行上却不断出现语法错误，但是我无法查明是什么原因引起的.我是ocaml的新手，我们将不胜感激.

I'm trying to implement this algorithm but I keep getting a syntax error on the 12th line but I cannot pinpoint what is causing it. I'm new to ocaml and any help would be greatly appreciated.

"要通过Eratosthenes的方法查找所有小于或等于给定整数n的素数:

"To find all the prime numbers less than or equal to a given integer n by Eratosthenes' method:

创建一个从2到n的连续整数列表:(2，3，4，...，n). 最初，让p等于2，第一个素数. 从p开始，通过以p的增量计数到n来枚举其倍数，并在列表中标记它们(它们将是2p，3p，4p ...；不应标记p本身). 在未标记的列表中找到大于p的第一个数字.如果没有这样的号码，请停止.否则，让p现在等于这个新数字(这是下一个质数)，然后从步骤3开始重复."

Create a list of consecutive integers from 2 through n: (2, 3, 4, ..., n). Initially, let p equal 2, the first prime number. Starting from p, enumerate its multiples by counting to n in increments of p, and mark them in the list (these will be 2p, 3p, 4p, ... ; the p itself should not be marked). Find the first number greater than p in the list that is not marked. If there was no such number, stop. Otherwise, let p now equal this new number (which is the next prime), and repeat from step 3."

let prime(n) =
    let arr = Array.create n false in
    let set_marks (arr , n , prime ) = Array.set arr (n*prime) true  in 
        for i = 2 to n do 
            set_marks(arr,i,2) done   

    let findNextPrimeNumberThatIsNotMarked (arr, prime , index ) =
        let nextPrime = Array.get arr index in 
        let findNextPrimeNumberThatIsNotMarkedHelper (arr, prime, index)  =
            if nextPrime > prime then nextPrime  
            else prime in       

    ;;  

推荐答案

添加到Jeffrey的答案中，

Adding to Jeffrey's answer,

我已经在"在这里?，

您现在绝对需要做的是安装并使用适当的OCaml压痕工具以及自动压痕线.意外的自动缩进结果通常表示语法错误，例如忘记;.没有这样的工具，即使是有才华的OCaml程序员也很难编写没有语法错误的OCaml代码.

What you absolutely need to do right now is to install and use a proper OCaml indentation tool, and auto-indent lines. Unexpected auto-indent results often indicate syntactic mistakes like forgetting ;. Without such tools, it is very hard even for talented OCaml programmers to write OCaml code without syntax errors.

有很多用于OCaml的自动压头:

There are bunch of auto indenters for OCaml available:

• Emacs和Vim的ocp-indent https://github.com/OCamlPro/ocp-indent
• Emacs的Caml模式和Tuareg模式
• Vim应该还有其他压头，但我不知道...

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