ATOF(3)
NAME
atof, atoi, atol − convert ASCII to numbers
USAGE
double atof(nptr) char *nptr;
atoi(nptr) char *nptr;
long atol(nptr) char *nptr;
DESCRIPTION
These functions convert the string that nptr points to into floating, integer, and long integer representation, respectively. The first character that the function does not recognize ends the string.
Atof recognizes an optional string of spaces, then an optional sign, then a string of digits which may contain 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, and then a string of digits.
NOTES
None of these functions has provisions for overflow.