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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by peter.cook[/i] [br]Origin Version (Select Help-->About Origin): 7.5 SR5 Operating System: Win2000 Hi, Using an external C++ dll I have eg (eg dValue = 65.23456) sprintf(Numchar,"%.2f",dValue); dValue=atof(Numchar); my problem is that Numchar may be represented by eg '65.23' but after atof dValue may occasionally end up as eg 65.2300000001. Similarly I can get eg 98.89999999999 from 98.9 Any hints as to how to avoid this 'precision' problem? Thanks, Cheers, Pete [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.