EiffelBase class
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Eiffel Class
indexing
description: "Basic mathematical operations, double-precision. This class may be used as ancestor by classes needing its facilities.";
status: "See notice at end of class";
date: "$Date: 2007-03-30 19:10:11 +0000 (Fri, 30 Mar 2007) $";
revision: "$Revision: 95354 $"
class DOUBLE_MATH
inherit
MATH_CONST
export
{NONE} all
end
feature -- Access
log_2 (v: DOUBLE): DOUBLE is
-- Base 2 logarithm of v
local
a: DOUBLE
do
a := 2.0;
Result := log (v) / log (a)
end;
cosine (v: DOUBLE): DOUBLE is
-- Trigonometric cosine of radian v approximated
-- in the range [-pi/4, +pi/4]
external
"C | <math.h>"
alias
"cos"
end;
arc_cosine (v: DOUBLE): DOUBLE is
-- Trigonometric arccosine of radian v
-- in the range [0, pi]
external
"C | <math.h>"
alias
"acos"
end;
sine (v: DOUBLE): DOUBLE is
-- Trigonometric sine of radian v approximated
-- in range [-pi/4, +pi/4]
external
"C | <math.h>"
alias
"sin"
end;
arc_sine (v: DOUBLE): DOUBLE is
-- Trigonometric arcsine of radian v
-- in the range [-pi/2, +pi/2]
external
"C | <math.h>"
alias
"asin"
end;
tangent (v: DOUBLE): DOUBLE is
-- Trigonometric tangent of radian v approximated
-- in range [-pi/4, +pi/4]
external
"C | <math.h>"
alias
"tan"
end;
arc_tangent (v: DOUBLE): DOUBLE is
-- Trigonometric arctangent of radian v
-- in the range [-pi/2, +pi/2]
external
"C | <math.h>"
alias
"atan"
end;
sqrt (v: DOUBLE): DOUBLE is
-- Square root of v
external
"C | <math.h>"
end;
log (v: DOUBLE): DOUBLE is
-- Natural logarithm of v
external
"C | <math.h>"
end;
log10 (v: DOUBLE): DOUBLE is
-- Base 10 logarithm of v
external
"C | <math.h>"
end;
floor (v: DOUBLE): DOUBLE is
-- Greatest integral less than or equal to v
external
"C | <math.h>"
end;
ceiling (v: DOUBLE): DOUBLE is
-- Least integral greater than or equal to v
external
"C | <math.h>"
alias
"ceil"
end;
feature {NONE} -- Implementation
dabs (v: DOUBLE): DOUBLE is
-- Absolute of v
external
"C | <math.h>"
alias
"fabs"
end;
end -- class DOUBLE_MATH
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