Texas Instruments TMS34010 Reference Manual page 100

ASCII to Number atof/atoi/atol
Syntax
#include <stdlib.h>
double atof(nptr)
char *nptr;
int atoi(nptr)
char *nptr;
long int atol(nptr)
char *nptr;
Defined in atof . c and atoi. c in rts. src
Description Three functions convert ASCII strings to numeric representations:
• The
atof
function converts a string to a floating-point value. Argu-
ment nptr points to the string; the string must have the following
format:
[space] [sign] digits [.digits] [el£ [sign] integer]
• The atoi function converts a string to an integer. Argument nptr
points to the string; the string must have the following format:
[space] [sign] digits
• The
atol
function converts a string to a long integer. Argument nptr
points to the string; the string must have the following format:
[space] [sign] digits
The
space
is indicated by a space (from the space bar), a horizontal or ver-
tical tab, a carriage return, a form feed, or a newline. Following the space
is an optional
sign,
and then
digits
that represent the integer portion of the
number. The fractional part of the number follows, then the exponent, in-
cluding an optional
sign.
The first character that cannot be part of the number terminates the string.
Since
int
and
long
are functionally equivalent in TMS3401 0 C, the atoi and
atol functions are also functionally equivalent.
The functions do not handle any overflow resulting from the conversion.
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