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ActiveTcl User Guide |
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Tcl_GetInt, Tcl_GetDouble, Tcl_GetBoolean - convert from string to
integer, double, or boolean
#include <tcl.h>
int
Tcl_GetInt(interp, src, intPtr)
int
Tcl_GetDouble(interp, src, doublePtr)
int
Tcl_GetBoolean(interp, src, boolPtr)
- Tcl_Interp *interp
(in)
- Interpreter to use for error reporting.
- const char *src (in)
- Textual value to be converted.
- int *intPtr (out)
- Points to place to store integer value converted from
src.
- double *doublePtr (out)
- Points to place to store double-precision floating-point value
converted from src.
- int *boolPtr (out)
- Points to place to store boolean value (0 or 1) converted from
src.
These procedures convert from strings to integers or
double-precision floating-point values or booleans (represented as
0- or 1-valued integers). Each of the procedures takes a src
argument, converts it to an internal form of a particular type, and
stores the converted value at the location indicated by the
procedure's third argument. If all goes well, each of the
procedures returns TCL_OK. If src does not have the
proper syntax for the desired type then TCL_ERROR is
returned, an error message is left in the interpreter's result, and
nothing is stored at *intPtr or *doublePtr or
*boolPtr.
Tcl_GetInt expects src to consist of a collection
of integer digits, optionally signed and optionally preceded by
white space. If the first two characters of src after the
optional white space and sign are “0x” then src
is expected to be in hexadecimal form; otherwise, if the first such
character is “0” then src is expected to be in
octal form; otherwise, src is expected to be in decimal
form.
Tcl_GetDouble expects src to consist of a
floating-point number, which is: white space; a sign; a sequence of
digits; a decimal point; a sequence of digits; the letter
“e”; a signed decimal exponent; and more white space.
Any of the fields may be omitted, except that the digits either
before or after the decimal point must be present and if the
“e” is present then it must be followed by the exponent
number.
Tcl_GetBoolean expects src to specify a boolean
value. If src is any of 0, false, no,
or off, then Tcl_GetBoolean stores a zero value at
*boolPtr. If src is any of 1, true,
yes, or on, then 1 is stored at *boolPtr. Any
of these values may be abbreviated, and upper-case spellings are
also acceptable.
boolean, conversion, double, floating-point, integer
Copyright © 1995-1997 Roger E. Critchlow Jr.
Copyright © 1989-1993 The Regents of the University of
California. Copyright © 1994-1996 Sun Microsystems, Inc.