decimal_to_single, decimal_to_double, decimal_to_extended - convert decimal record to floating-point value

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SYNOPSIS

void decimal_to_single(px, pm, pd, ps)
single *px ;
decimal_mode *pm;
decimal_record *pd;
fp_exception_field_type *ps;

void decimal_to_double(px, pm, pd, ps)
double *px ;
decimal_mode *pm;
decimal_record *pd;
fp_exception_field_type *ps;

void decimal_to_extended(px, pm, pd, ps)
extended *px ;
decimal_mode *pm;
decimal_record *pd;
fp_exception_field_type *ps;

DESCRIPTION

The decimal_to_floating() functions convert the decimal record at *pd into a floating-point value at *px, observing the modes specified in *pm and setting exceptions in *ps. If there are no IEEE exceptions, *ps will be zero.

pd->sign and pd->fpclass are always taken into account. pd->exponent and pd->ds are used when pd->fpclass is fp_normal or fp_subnormal. In these cases pd->ds must contain one or more ascii digits followed by a null character. *px is set to a correctly rounded approximation to

(pd->sign)*(pd->ds)*10**(pd->exponent)

Thus if pd->exponent == -2 and pd->ds == "1234", *px will get 12.34 rounded to storage precision. pd->ds cannot have more than DECIMAL_STRING_LENGTH-1 significant digits because one character is used to terminate the string with a null character. If pd->more != 0 on input then additional nonzero digits follow those in pd->ds; fp_inexact is set accordingly on output in *ps.

*px is correctly rounded according to the IEEE rounding modes in pm->rd. *ps is set to contain fp_inexact, fp_underflow, or fp_overflow if any of these arise.

pd->ndigits, pm->df, and pm->ndigits are not used.

strtod.3 scanf.3v fscanf(), and sscanf() all use decimal_to_double().

SEE ALSO

Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97