XPost: comp.lang.c   
   From: jahns@idontlikespam.dkrz.de   
      
   On 03/30/15 13:17, jacob navia wrote:   
   > I do not have the proof of it. Maybe one of the math people can help me out?   
      
   Testing for integer multiplication overflow can be surprisingly involved in the   
   general case:   
      
   http://www.fefe.de/intof.html   
      
   Regards, Thomas   
      
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