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## DLabPascal - Predefined Constants

The following constants are defined as return values of the MessageDlg function:

 Identifier Value Description mrNone 0 no response mrOk 1 user clicked the "OK" button mrCancel 2 "cancel" button mrAbort 3 "abort" button mrRetry 4 "retry" button mrIgnore 5 "ignore" button mrYes 6 "yes" button mrNo 7 "no" button mrAll 8 "all" button mrNoToAll 9 "no to all" button mrYesToAll 10 "yes to all" button

DLabPascal provides a collection of often needed mathematical constants:(1)

 Identifier Value Description uc_e 2.718281828459045235360 Euler's number e uc_etom1 0.367879441171442321596 1/e uc_lg2 0.301029995663981195214 common logarithm of 2 uc_lg5 0.698970004336018804803 common logarithm of 5 uc_lge 0.434294481903251827651 common logarithm of e uc_lgPi 0.497149872694133854351 common logarithm of Pi uc_ln10 2.302585092994045684018 natural logarithm of 10 uc_ln2 0.693147180559945309417 natural logarithm of 2 uc_lnPi 1.144729885849400174143 natural logarithm of Pi uc_PiH 1.570796326794896619231 Pi/2 (1) uc_PiSqr 9.869604401089358618834 Pi*Pi uc_Pitom1 0.318309886183790671538 1/Pi uc_sqrt2 1.414213562373095048802 square root of 2 uc_sqrt2pi 2.506628274631000502416 square root of 2*Pi uc_sqrt2pitom1 0.3989422804014326779399 1/(square root of 2*Pi) uc_MaxSingle 3.4e38 maximum single number uc_MaxDouble 1.7e308 maximum double number uc_MaxExtended 1.1e4932 maximum extended number uc_MinSingle 1.5e-45 minimum single number uc_MinDouble 5.0e-324 minimum double number uc_MinExtended 3.6e-4951 minimum extended number

The following constants are system-wide constants of DataLab:

 Identifier Value Description MAXCLASSES 127 max. number of supported classes MAXNOMINALIDS 150 max. number of supported nominal identifiers in TDataTable MAXPOLFITORDER 10 max. order of polynomial fit in CalcPolyFit and CalcCenteredPolyFit

 (1) Please note that for syntactical reasons the numerical value of p (pi = 3.14159...) is not defined as a constant ("uc_pi") but as a function (pi).