Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #37938

Re: Can Java 8 do exact arithmetic as in C#

Show all headers | View raw

On 1/8/2018 7:21 AM, j4n bur53 wrote:
> The source code is available, its a pure Java
> implementation, no native code. For example addExact
> is implemented as follows:
> 
>      /**
>       * Returns the sum of its arguments,
>       * throwing an exception if the result overflows an {@code int}.
>       *
>       * @param x the first value
>       * @param y the second value
>       * @return the result
>       * @throws ArithmeticException if the result overflows an int
>       * @since 1.8
>       */
>      public static int addExact(int x, int y) {
>          int r = x + y;
>          // HD 2-12 Overflow iff both arguments
>          // have the opposite sign of the result
>          if (((x ^ r) & (y ^ r)) < 0) {
>              throw new ArithmeticException("integer overflow");
>          }
>          return r;
>      }
> 
> HD 2-12 probably means Handbook of ... (who knows?)
> chapter 2 section 12.

https://en.wikipedia.org/wiki/Hacker's_Delight

... would be my guess.

-- 
esosman@comcast-dot-net.invalid
Eleven hundred eight days to go.

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Can Java 8 do exact arithmetic as in C# bursejan@gmail.com - 2018-01-08 04:17 -0800
  Re: Can Java 8 do exact arithmetic as in C# j4n bur53 <janburse@fastmail.fm> - 2018-01-08 13:21 +0100
    Re: Can Java 8 do exact arithmetic as in C# Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-01-08 08:42 -0500
      Re: Can Java 8 do exact arithmetic as in C# j4n bur53 <janburse@fastmail.fm> - 2018-01-08 21:11 +0100
        Re: Can Java 8 do exact arithmetic as in C# bursejan@gmail.com - 2018-01-08 18:08 -0800
          Re: Can Java 8 do exact arithmetic as in C# bursejan@gmail.com - 2018-01-08 18:22 -0800
          Re: Can Java 8 do exact arithmetic as in C# v_borchert@despammed.com (Volker Borchert) - 2018-01-09 19:48 +0000
  Re: Can Java 8 do exact arithmetic as in C# Arne Vajhøj <arne@vajhoej.dk> - 2018-01-08 20:04 -0500
    Re: Can Java 8 do exact arithmetic as in C# bursejan@gmail.com - 2018-01-08 17:53 -0800

csiph-web