Tcl_GetInt(3)

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NAME

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

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_GetInt(interp, string, intPtr)

       int
       Tcl_GetDouble(interp, string, doublePtr)

       int
       Tcl_GetBoolean(interp, string, boolPtr)

ARGUMENTS

       Tcl_Interp   *interp      (in)      Interpreter  to   use   for   error
                                           reporting.

       CONST char   *string      (in)      Textual value to be converted.

       int          *intPtr      (out)     Points  to  place  to store integer
                                           value converted from string.

       double       *doublePtr   (out)     Points to place  to  store  double-
                                           precision floating-point value con-
                                           verted from string.

       int          *boolPtr     (out)     Points to place  to  store  boolean
                                           value   (0  or  1)  converted  from
                                           string.
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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 inte-
       gers).  Each of the procedures takes a string 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 string doesn't
       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 string to consist of a collection of integer digits,
       optionally signed and optionally preceded by white space.  If the first
       two characters of string are ``0x'' then string is expected  to  be  in
       hexadecimal form;  otherwise, if the first character of string is ``0''
       then string is expected to be in  octal  form;   otherwise,  string  is
       expected to be in decimal form.

       Tcl_GetDouble  expects  string  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'';  and a signed decimal
       exponent.  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 string to specify a boolean value.  If string is
       any of 0, false, no, or off, then Tcl_GetBoolean stores a zero value at
       *boolPtr.  If string 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.

KEYWORDS

       boolean, conversion, double, floating-point, integer

Tcl                                                              Tcl_GetInt(3)