Re: Distinguish float and integer types from string

[Johann Lermer via Digitalmars-d-learn]

On Saturday, 9 March 2019 at 18:11:09 UTC, Jacob Shtokolov wrote:
I tried to use std.conv.to and std.conv.parse, but found that 
they can't really do this. When I call `data.to!int`, the value 
of "123.45" will be converted to int!

Are you sure? This here works for me:

import std.stdio;
import std.string;
import std.conv;

void main ()
{
    auto s = readln.strip;

    try
    {
        int i = to!int (s);
        writefln ("string is an int: %s", i);
    }
    catch(Exception e)
    {
        try
        {
            float f = to!float(s);
            writefln ("string is a float: %s", f);
        }
        catch(Exception e)
        {
            writefln ("string is an neither an int nor a float: 
%s", s);
        }
    }
}