A/UX® Programmer's Reference Sections

strtod(3C) strtod(3C)
NAME
strtod - convert string to double-precision number
SYNOPSIS
double strtod (str, ptr)
char *str, **ptr;
DESCRIPTION
strtod returns as a double-precision floating-point number, the
value represented by the character string pointed to by str. The
string is scanned up to the first unrecognized character.
strtod recognizes an optional string of "white-space" characters
(as defined by isspace in ctype(3C)), then an optional
sign, then a string of digits optionally containing a decimal point,
then an optional e or E followed by an optional sign or space, followed
by an integer.
If the value of ptr is not (char * *) NULL, a pointer to the character
terminating the scan is returned in the location pointed to by
ptr. If no number can be formed, *ptr is set to str, and zero is returned.
SEE ALSO
bstring(3), atof(3C), ctype(3C), memcpy(3C),
scanf(3S), string(3C). strtol(3C).
DIAGNOSTICS
If the correct value would cause overflow, ±HUGE is returned (according
to the sign of the value), and errno is set to ERANGE.
If the correct value would cause underflow, zero is returned and
errno is set to ERANGE.
1
February, 1990
RevisionC