atof.3

Unix操作系统minix 2.0源码

.\"	@(#)atof.3	6.1 (Berkeley) 5/15/85
.\"
.TH ATOF 3  "May 15, 1985"
.AT 3
.SH NAME
atof, atoi, atol \- convert ASCII to numbers
.SH SYNOPSIS
.nf
.ft B
#include <stdlib.h>

double atof(const char *\fInptr\fP)
int atoi(const char *\fInptr\fP)
long atol(const char *\fInptr\fP)
.ft R
.fi
.SH DESCRIPTION
These functions convert a string pointed to by
.I nptr
to floating, integer, and long integer representation respectively.
The first unrecognized character ends the string.
.PP
.B Atof
recognizes an optional string of 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.
.PP
.B Atoi
and
.B atol
recognize an optional string of spaces, then an optional sign, then a
string of
digits.
.SH SEE ALSO
.BR strtol (3),
.BR strtod (3),
.BR scanf (3).
.SH BUGS
There are no provisions for overflow.