NAME
atof, atoi, atol - convert ASCII to numbers

SYNOPSIS
double atof(nptr)
const char *nptr;

int atoi(nptr)
const char *nptr;

long atol(nptr)
const 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(3)

BUGS
There are no provisions for overflow.