atof(3C)                                                 atof(3C)



NAME
     atof, atoi, atol - convert ASCII to numbers

SYNOPSIS
     double atof (nptr)
     char *nptr;

     int 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 respec-
     tively.  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
     itoa(3C), strtod(3C), strtol(3C), scanf(3S).

DIAGNOSTICS
     In the att universe, if the correct result of atof would
     cause overflow, +HUGE is returned (according to the sign of
     the value), and errno is set to ERANGE.  If the correct
     value would cause underflow, zero is returned and errno is
     set to ERANGE.

BUGS
     Other than the single case mentioned above, overflow condi-
     tions are ignored.
















Page 1                        CX/UX Programmer's Reference Manual