osd@hou2d.UUCP (Orlando Sotomayor-Diaz) (05/11/86)
From: Orlando Sotomayor-Diaz (The Moderator) <cbosgd!std-c>
mod.std.c Digest Sat, 10 May 86 Volume 16 : Issue 3
Today's Topics:
Differences from April 1985 to February 1986 Draft Standard, Part 2
----------------------------------------------------------------------
Date: Sun, 27 Apr 86 01:17:06 est
From: <ihnp4!utcsri!lsuc!msb%utcsri>
Subject: Differences from April 1985 to February 1986 Draft Standard, Part 2
To: cbosgd!std-c%utcsri
# B.1.1.3 Diagnostics
* A conforming implementation shall produce {a --> at least one}
* diagnostic message for every {--> source file that contains a}
violation of any syntax rule or constraint.
# B.1.2.2 Hosted environment
<--O The function called at program startup is called main, and can be
<--O declared as
<--O extern int main(int argc, char *argv[]);
N--> The function called at program startup is called main. The im-
N--> plementation declares no prototype for this function. It can be
N--> defined with no parameters:
N--> int main(void) { /*...*/ }
N--> or two parameters (referred to here as argc and argv, though any
N--> names may be used, as they are local to the function in which
N--> they are declared):
N--> int main(int argc, char *argv[]) { /*...*/ }
* {--> If they are defined,} the parameters to main have the fol-
lowing constraints:
# B.1.2.3 Program execution
<--O All output directed to interactive devices must occur before new
<--O interactively generated input is accepted.
N--> The input and output dynamics of interactive devices shall take
N--> place as specified in #D.9.
N--> ... The intent of the requirements of #D.9 is that unbuffered or
N--> line-buffered output appear as soon as possible, to ensure that
N--> prompting messages actually appear prior to a program waiting for
N--> input.
# B.1.2.3 Program execution
N--> ... Alternatively, an operation involving only ints or floats
N--> may be executed using double precision operations if neither
N--> range nor precision is lost thereby.
# B.1.2.3 Program execution
* Forward references: ..., sequence points (#C.3, {--> #C.6}), ...
# B.2.1 Character sets
The following trigraph sequences ... shall be replaced by the
specified characters ...
N--> Any other trigraph sequence that begins with ?? is unchanged.
The trigraph sequences enable the input of characters that are
* not defined in the ISO {646 --> 646-1983} Invariant Code Set,
which is a subset of the seven-bit ASCII code set.
# B.2.2 Character display semantics
* The "{printing --> active} position" is that location on a
display device where the next character output by the fputc func-
* tion would appear. The {effect --> intent} of writing a print-
able character (as defined by the isprint function) to a display
device is to display a graphic representation of that character
* at the {current printing --> active} position and then advance
* the {printing --> active} position to the next position on the
* current line. {--> If the active position is at the final posi-
tion of a line (if there is one), the behavior is unspecified.}
Alphabetic escape sequences representing non-graphic characters
* {--> in the execution character set are intended to} produce for-
mat effecting actions on display devices as follows:
* \a ("alert") Produces an {implementation-defined -->} audible or
* visible representation of an alert character. {Any consequent
alteration to the printing position is implementation-defined.
--> The active position shall not be changed.}
* ... \v ("vertical tab") Moves the {printing --> active} position
* to the initial {printing --> active} position of the next
* {implementation-defined -->} vertical tabulation position. {-->
If the active position is at or past the last defined vertical
tabulation position, the behavior is unspecified.}
# B.2.3 Signals and interrupts
Functions shall be implemented such that they may be interrupted
at any time by a signal, and may be called by a signal handler
* with no alteration {--> to control flow, to function return
values, or} to objects with automatic storage duration belonging
to earlier invocations.
# B.2.3 Signals and interrupts
N--> The functions in the standard library are not guaranteed to be
N--> reentrant and may modify objects with static storage duration.
# B.2.4.1 Translation limits
* The implementation shall be able to {compile at least one -->
* translate and execute a} program that {meets or exceeds all -->
* contains at least one instance} of the following {translation
-->} limits:
* ... {6 --> 12} pointer, array, and function declarators modify-
ing a basic type in a declaration
* ... {1024 --> 127} identifiers with block scope in one block
* 1024 macro identifiers {--> simultaneously defined} in one source
file
* 31 parameters in one function {--> definition and} call
* 31 parameters in one macro {--> definition and invocation}
N--> ... 509 characters in a string literal (after concatenation)
N--> 32767 bytes in an object (in a hosted environment only)
* {4 --> 8} nesting levels for #included files
<--O maximum number of alphabetic cases in an external identifier (1)
# B.2.4.2 Numerical limits
A conforming implementation shall document all these items, which
* are specified in the headers <limits.h> {--> and <float.h>}.
* Sizes of integral types {--> <limits.h>}
The values given below shall be replaced by implementation-
* defined {values --> constant expressions} that shall be equal or
greater in magnitude (absolute value).
# B.2.4.2 Numerical limits
* Characteristics of floating types {--> <float.h>}
N--> The integer values given below shall be replaced by
N--> implementation-defined constant expressions that shall be equal
N--> or greater in magnitude (absolute value). Values that have
N--> floating type need not be constant expressions.
N--> The following apply to all three floating-point types and require
N--> only one name.
radix of exponent representation
FLT_RADIX 2
* {DBL_RADIX 2 -->}
* {LDBL_RADIX 2 -->}
* addition rounds (1), chops (0), {--> or indeterminable during
translation (-1)}
FLT_ROUNDS 0
* {DBL_ROUNDS 0 -->}
* {LDBL_ROUNDS 0 -->}
N--> guard digits are used (1) or not used (0) for floating multipli-
N--> cation
N--> FLT_GUARD 0
N--> floating values must be normalized (1) or need not be (0)
N--> FLT_NORMALIZE 0
<--O maximum power of 10 that can be represented ...
<--O FLT_MAX_EXP +38
<--O DBL_MAX_EXP +38
<--O LDBL_MAX_EXP +38
<--O minimum power of 10 that can be represented ...
<--O FLT_MIN_EXP -38
<--O DBL_MIN_EXP -38
<--O LDBL_MIN_EXP -38
N--> maximum representable finite floating-point number
N--> FLT_MAX 1E+38
N--> DBL_MAX 1E+38
N--> LDBL_MAX 1E+38
N--> minimum representable positive floating-point number
N--> FLT_MIN 1E-38
N--> DBL_MIN 1E-38
N--> LDBL_MIN 1E-38
N--> maximum integer such that FLT_RADIX raised to that power yields a
N--> representable finite floating-point number
N--> FLT_MAX_EXP
N--> DBL_MAX_EXP
N--> LDBL_MAX_EXP
N--> minimum negative integer such that FLT_RADIX raised to that power
N--> yields a representable positive floating-point number
N--> FLT_MIN_EXP
N--> DBL_MIN_EXP
N--> LDBL_MIN_EXP
N--> maximum integer such that 10 raised to that power yields a
N--> representable finite floating-point number
N--> FLT_MAX_10_EXP +38
N--> DBL_MAX_10_EXP +38
N--> LDBL_MAX_10_EXP +38
N--> minimum negative integer such that 10 raised to that power yields
N--> a representable positive floating-point number
N--> FLT_MIN_10_EXP -38
N--> DBL_MIN_10_EXP -38
N--> LDBL_MIN_10_EXP -38
number of decimal digits of precision
FLT_DIG 6
DBL_DIG 6
LDBL_DIG 6
N--> number of base-FLT_RADIX digits in the floating-point mantissa
N--> FLT_MANT_DIG
N--> DBL_MANT_DIG
N--> LDBL_MANT_DIG
N--> number of base-FLT_RADIX digits in the floating-point exponent
N--> (including bias or sign)
N--> FLT_EXP_DIG
N--> DBL_EXP_DIG
N--> LDBL_EXP_DIG
N--> minimum positive floating point number x such that 1.0 + x != 1.0
N--> FLT_POS_EPS 1E-5
N--> DBL_POS_EPS 1E-5
N--> LDBL_POS_EPS 1E-5
N--> minimum positive floating point number x such that 1.0 - x != 1.0
N--> FLT_NEG_EPS 1E-5
N--> DBL_NEG_EPS 1E-5
N--> LDBL_NEG_EPS 1E-5
N--> minimum integer such that FLT_RADIX raised to that power yields a
N--> floating-point number x such that 1.0 + x != 1.0
N--> FLT_POS_EPS_EXP
N--> DBL_POS_EPS_EXP
N--> LDBL_POS_EPS_EXP
N--> minimum integer such that FLT_RADIX raised to that power yields a
N--> floating-point number x such that 1.0 - x != 1.0
N--> FLT_NEG_EPS_EXP
N--> DBL_NEG_EPS_EXP
N--> LDBL_NEG_EPS_EXP
------------------------------
End of mod.std.c Digest - Sat, 10 May 86 18:51:13 EDT
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