NAME

       Tcl_GetInt,  Tcl_GetDouble,  Tcl_GetBoolean  -  convert from string to integer, double, or
       boolean

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_GetInt(interp, src, intPtr)

       int
       Tcl_GetDouble(interp, src, doublePtr)

       int
       Tcl_GetBoolean(interp, src, intPtr)

ARGUMENTS

       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.
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DESCRIPTION

       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.

       Tcl_GetInt expects src to consist of a collection of integer digits, optionally signed and
       optionally preceded and followed 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 characters are “0o” then src is expected to be in octal form;
       otherwise, if the first such characters are “0b” then src is  expected  to  be  in  binary
       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. If  there  are  no  fields
       apart  from  the  sign  and initial sequence of digits (i.e., no decimal point or exponent
       indicator), that initial sequence of digits should take one of the forms  that  Tcl_GetInt
       supports,  described  above. The use of “,” as a decimal point is not supported nor should
       any other sort of inter-digit separator be present.

       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 *intPtr.  If src is any of 1, true, yes,
       or on, then 1 is stored at *intPtr.  Any of these values may be  abbreviated,  and  upper-
       case spellings are also acceptable.

KEYWORDS

       boolean, conversion, double, floating-point, integer