Haskell中的负双打或浮动（macports） [英] Negative doubles or floats in Haskell (macports)

问题描述

为什么当我尝试显示负双或浮动时出现分段错误？负数整数没有问题。

  Prelude>让a = 4 
 Prelude> ：t a 
 a ::整数
前奏>让b = -4 
前奏> b 
 -4 
前奏> ：t b 
 b :: Integer 
 Prelude>让c = 5.6 
 Prelude> ：t c 
 c :: Double 
 Prelude>让d = -5.6 
前奏> ：t d 
 d :: Double 
 Prelude>显示d 
 - 分段错误
  

我尝试过不同的方法，版本信息：

  ghci --version 
 Glorious Glasgow Haskell编译系统，版本6.10.4 
  

解决方案

MacPorts上的GHC似乎被打破。请参阅 https://trac.macports.org/ticket/25265

请考虑从haskell.org安装Haskell Platform，其中包含GHC 6.12.3和一束Haskelly的好东西。

• 信息： http://hackage.haskell.org/platform/


• 链接：< a href =http://hackage.haskell.org/platform/mac.html> http://hackage.haskell.org/platform/mac.html

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Why do I get a segmentation fault when I try to show a negative double or float? There is no problem for negative integers.

Prelude> let a = 4
Prelude> :t a
a :: Integer
Prelude> let b = -4
Prelude> b
-4
Prelude> :t b
b :: Integer
Prelude> let c = 5.6
Prelude> :t c
c :: Double
Prelude> let d = -5.6
Prelude> :t d
d :: Double
Prelude> show d
"-Segmentation fault

I tried it various ways, it seems that the number is correctly understood but not shown. Version info:

ghci --version
The Glorious Glasgow Haskell Compilation System, version 6.10.4

解决方案

GHC on MacPorts seems to be broken. See https://trac.macports.org/ticket/25265

Consider instead installing the Haskell Platform from haskell.org, which includes GHC 6.12.3 and a bundle of Haskelly goodies.

• Info: http://hackage.haskell.org/platform/
• Link: http://hackage.haskell.org/platform/mac.html

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