https://communities.sas.com/t5/SAS-Programming/Calculation/m-p/26564#M4751 Roundoff.<BR /> <BR /> SAS stores all numbers in floating point. The largest is 8 bytes. Your OS companion can tell you how big a number can be stored with what level of precision.<BR /> <BR /> Doc Muhlbaier<BR /> Duke Thu, 10 Mar 2011 14:32:39 GMT Doc_Duke 2011-03-10T14:32:39Z https://communities.sas.com/t5/SAS-Programming/Calculation/m-p/26563#M4750 Hi all,<BR /> <BR /> why would this piece of code <BR /> <BR /> ---<BR /> data _null_;<BR /> <BR /> format a b 31.15;<BR /> <BR /> a = 12345678912345.123456789123456;<BR /> <BR /> b = a + 1;<BR /> <BR /> run;<BR /> ---<BR /> <BR /> result in<BR /> <BR /> b = 12345678912346.100000000000000?<BR /> <BR /> OS is AIX.<BR /> <BR /> Thanks,<BR /> Thomas Thu, 10 Mar 2011 14:03:28 GMT https://communities.sas.com/t5/SAS-Programming/Calculation/m-p/26563#M4750 ThomasH 2011-03-10T14:03:28Z https://communities.sas.com/t5/SAS-Programming/Calculation/m-p/26564#M4751 Roundoff.<BR /> <BR /> SAS stores all numbers in floating point. The largest is 8 bytes. Your OS companion can tell you how big a number can be stored with what level of precision.<BR /> <BR /> Doc Muhlbaier<BR /> Duke Thu, 10 Mar 2011 14:32:39 GMT https://communities.sas.com/t5/SAS-Programming/Calculation/m-p/26564#M4751 Doc_Duke 2011-03-10T14:32:39Z