AT&T UNIX™PC Unix System V Users Manual - tenox

ATOF ( 3C ) ATOF ( 3C )
NAME
atof - convert ASCll string to floating-point number
SYNOPSIS
double a.tof (nptr)
char *nptr;
DESCRIPTION
Atof converts a character string pointed to by nptr to a doubleprecision
floating-point number. The first unrecognized character
ends the conversion. Atof recognizes an optional string of whitespace
characters, then an optional sign, then a string of digits
optionally containing a decimal point, then an optional e or E followed
by an optionally signed integer. If the string begins with an
unrecognized character, atof returns the value zero.
DIAGNOSTICS
When the correct value would overflow, atof returns HUGE, and
sets errno to ERANGE. Zero is returned on underflow.
SEE ALSO
scanf(3S).
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