Special variables: Difference between revisions
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=={{header|ALGOL W}}==
<lang algolw>% the Algol W standard environment includes the following standard variables: %
integer I_W % field width for integer output %
integer R_W % field width for real output %
integer R_D % number of decimal places for real output %
string(1) R_FORMAT % format for real output:
S - "scaled" normalised mantissa with exponent
A - "aligned" fixed point format
F - "free" either scaled or aligned as appropriate
for the value and field width
%
integer S_W % separator width - number of spaces following non-string output items %
integer MAXINTEGER % largest integer value %
real EPSILON % largest positive real number such that 1 + epsilon = 1 %
long real LONGEPSILON % largest positive long real number such that 1 + longepsilon = 1 %
long real MAXREAL % largest real number %
long real PI % approximation to pi %
% the following reference(EXCEPTION) variables control how errors are handled:
ENDFILE - end-of-file
OVFL - overflow
UNFL - underflow
DIVZERO - division by zero
INTOVFL - integer overflow
INTDIVZERO - integer division by zero or modulo 0
SQRTERR - invalid SQRT parameter
EXPERR - invalid EXP parameter
LNLOGERR - invalid LN or LOG parameter
SINCOSERR - invalid SIN or COS parameter
The EXCEPTION record is defined as follows:
record EXCEPTION( logical XCPNOTED - true if the exception has occurred
; integer XCPLIMIT - number of times the exception can occur
before the program terminates
, XCPACTION - if the program continues, controls how to
replace the erroneous value
; logical XCPMARK - true if an error message should be printed
even if the program continues
; string(64) XCPMSG - message to describe the exception
)
if the relevant EXCEPTION variable is null, the exception is ignored,
otherwise it is processed according to the settings of XCPLIMIT etc.
%</lang>
=={{header|AWK}}==
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