From: martin@gkc.org.uk   
      
   On 23/04/19 08:43, David Brown wrote:   
   > But mathematical identities such as associativity and commutativity are   
   > valid because signed integer overflow does not happen - thus "a * (b +   
   > c)" can be changed to "(a * b) + (a * c)".   
      
   If b is large and c has a value close to -b then a * (b + c)   
   might be OK while (a * b) will overflow and cause undefined   
   behaviour.   
      
   --   
   			Martin   
      
   Dr Martin Ward | Email: martin@gkc.org.uk | http://www.gkc.org.uk   
   G.K.Chesterton site: http://www.gkc.org.uk/gkc | Erdos number: 4   
      
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