ATOF.3
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上传日期:2007-02-01
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操作系统开发
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C/C++
- ." @(#)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 *fInptrfP)
- int atoi(const char *fInptrfP)
- long atol(const char *fInptrfP)
- .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.