RE: why here a int and not a float ?

 
To: [email protected]
From: [email protected]
Date: Sun, 22 Feb 2015 12:35:18 +0100
Subject: Re: "ocaml_beginners"::[] why here a int and not a float ?














 

 



  


    
      
      
      > I try to learn Ocaml by following the Ocaml from the very beginning. 

> 

> I have to write a function that multiplies a number by 10. 

> 

> So I did :  let multiply_ten x = x * 10 ;; 

> 

> but to my surprise I see that the function has this : val multiply_ten : int -> int = <fun> 

> 

> How can I change it so I can also calculate 2.5 * 10 ? 



Ocaml strictly distinguishes between floats and ints. That means you have to explicitly convert

from one to the other. It even uses different arithmetic operators:



* : int * int -> int

*. : float *. float -> float 



You can convert between float/int by

float : int -> float

truncate : float -> int



These functions might help, too:

ceil : float -> float

floor : float -> float



see here http://www.csc.villanova.edu/~dmatusze/resources/ocaml/ocaml.html#intops for example.



r.



[Non-text portions of this message have been removed]




I know that and according to the page you linked to  *  is Always a int.
But my question stays. How can I tell Ocaml when I make a function that it has to use floats instead of int.
 
Roelof