Ocaml 语法很奇怪 [英] Ocaml syntax quite weird
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问题描述
我在 Ocaml 中有这个程序,它从键盘读取一行并返回一个 int :
I have this program in Ocaml that reads a line from keyboard and returns an int :
let get_int () =
print_string "Insert a number\n" ;
let input = read_line() in
let return__ = int_of_string( input )
;;
print_string "I'll print what you write : ";
print_int ( get_int() );
print_string "\n"
问题是第 5 行的语法错误,;;
";编译器说.
The problem is a syntax error on line 5, ";;
" said the compiler.
我知道已经存在执行此操作的函数,但我这样做是为了学习.
I know that already exist functions that do this but I'm doing this to learn.
我阅读了官方的 Ocaml 文档,但我仍然不明白语法.有人可以向我解释一下吗?
I read the official Ocaml documentation but I still don't get the syntax. Someone that could explain me something about it?
推荐答案
您的 get_int
绑定必须以表达式结尾.你可以去掉最后一个 let
绑定并直接返回 int :
Your get_int
-binding has to end in an expression. You can get rid of the last let
-binding there and return the int directly:
let get_int () =
print_string "Insert a number\n";
let input = read_line () in
int_of_string input;;
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