NAME

atof, atoi, atol − convert ASCII to numbers

SYNOPSIS

double atof(nptr)
char ∗nptr;

atoi(nptr)
char ∗nptr;

long atol(nptr)
char ∗nptr;

DESCRIPTION

These functions convert a string pointed to by nptr to floating, integer, and long integer representation respectively.  The first unrecognized character ends the string. 

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. 

Atoi and atol recognize an optional string of spaces, then an optional sign, then a string of digits. 

SEE ALSO

scanf(3S)

BUGS

There are no provisions for overflow. 

Currently, atof performs highly inaccurate conversions of very large or very small numbers — on the order of 10∗∗32 or its reciprocal. 

Sun Release 2.0  —  Last change: 19 March 1984