User's Guide

STDC CX_LIMITED_RANGE Pragma
#pragma STDC CX_LIMITED_RANGE ON
#pragma STDC CX_LIMITED_RANGE OFF
This pragma enables limited range mathematical behavior for specific blocks of code. Note that,
this pragma applies to complex arithmetic only. Also see the ISO/IEC 9899 Standard.
This pragma can occur outside an external declaration or within a compound statement. When
outside external declarations, the pragma takes effect from its occurrence until another STDC
CX_LIMITED_RANGE pragma is encountered or until the end of the translation unit. When within
a compound statement, the pragma takes effect from its occurrence until another STDC
CX_LIMITED_RANGE pragma is encountered within a nested compound statement, or until the
end of the compound statement.
If this pragma is used in any other context, the behavior is undefined. The default state is off.
STDC FLOAT_CONST_DECIMAL64 Pragma
#pragma STDC FLOAT_CONST_DECIMAL64 [ON | OFF | DEFAULT]
With this pragma set to OFF, unsuffixed floating-point constants are treated as having type double.
With this pragma set to ON, unsuffixed floating-point constants are treated as having type
_Decimal64.
The pragma can occur in either of these two contexts:
• Outside external declarations
In this case, the pragma takes effect from its occurrence until another
FLOAT_CONST_DECIMAL64 pragma is encountered, or until the end of the translation unit.
• Preceding all explicit declarations and statements inside a compound statement.
In this case, the pragma takes effect from its occurrence until another
FLOAT_CONST_DECIMAL64 pragma is encountered (including within a nested compound
statement), or until the end of the compound statement; at the end of a compound statement,
the state for the pragma is restored to its condition just before the compound statement.
If this pragma is used in any other context, the behavior is undefined. The default state for the
pragma is OFF.
For more information on using Decimal FP, see the HP aC++/HP ANSI C Release Notes section
"Decimal floating-point arithmetic supported" under "New Features in the A.06.20 Release."
STDC FP_CONTRACT Pragma
#pragma STDC FP_CONTRACT ON
#pragma STDC FP_CONTRACT OFF
This pragma tells the compiler whether or not it is permitted to contract expressions. Also see
ISO/IEC 9899 Standard.
Each pragma can occur either outside external declarations or preceding all explicit declarations
and statements inside a compound statement. When outside external declarations, the pragma
takes effect from its occurrence until another FP_CONTRACT pragma is encountered, or until the
end of the translation unit. When inside a compound statement, the pragma takes effect from its
occurrence until another FP_CONTRACT pragma is encountered within a nested compound
statement, or until the end of the compound statement. At the end of a compound statement, the
state for the pragma is restored to its condition before the compound statement.
If this pragma is used in any other context, the behavior is undefined. The default state is ON.
Other Pragmas 109