NAME

atof (_latof) − convert ASCII string to floating-point number

SYNOPSIS

#include <math.h>

float atof (nptr)
char ∗nptr;

long float _latof (nptr)
char ∗nptr;

DESCRIPTION

(_l)atof converts a character string pointed to by nptr to a floating-point number of the indicated precision.  The first unrecognized character ends the conversion.  (_l)atof recognizes an optional string of white-space characters (tabs and spaces), 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, (_l)atof returns the value zero. 

DIAGNOSTICS

The low-level floating point routines will raise a floating point exception if the conversion done by (_l)atof overflows or underflows. 

SEE ALSO

fpsigset(3C), scanf(3S), strtol(3C). 

Version 3.6  —  December 20, 1987