sml - 如何将负整数转换为带有减号而不是波浪号的 SML 中的字符串？

Question

标准 SML 库函数 Int.toString 以负数为前缀，~而不是-。是否有一个库函数可以-代替，没有写

fun i2s i =
    if i < 0 then "-" ^ Int.toString (~i) else Int.toString i

Answer 1

In short, No.

SML is designed to use ~ for unary minus to avoid confusion with - (binary minus). It's a sensible decision when you have each operator for only one purpose and SML users have to live with that.

Although it's strange to read a string representation of an integer starting with ~, there's no library function to convert it to a string in the normal convention. BTW, your function is a good way to do so.