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LOGTEN.PAS
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Pascal/Delphi Source File
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1986-06-22
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2KB
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33 lines
(*--------------------------------------------------------------------------*)
(* LogTen --- Calculate base 10 logarithm *)
(*--------------------------------------------------------------------------*)
FUNCTION LogTen( X: REAL ) : REAL;
(*--------------------------------------------------------------------------*)
(* *)
(* Function: LogTen *)
(* *)
(* Purpose: Calculates base ten logarithm *)
(* *)
(* Calling Sequence: *)
(* *)
(* Logval := LogTen( X: REAL ) : REAL; *)
(* *)
(* X --- value to find logarithm of *)
(* *)
(* Logval --- resultant logarithm (X > 0); *)
(* = 0 if X <= 0. *)
(* *)
(* Calls: LN *)
(* *)
(*--------------------------------------------------------------------------*)
BEGIN (* LogTen *)
IF X <= 0.0 THEN
LogTen := 0.0
ELSE
LogTen := LN( X ) * LNTenInv;
END (* LogTen *);