Tcl_GetInt(3)               Tcl Library Procedures               Tcl_GetInt(3)


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

       #include <tcl.h>

       Tcl_GetInt(interp, string, intPtr)

       Tcl_GetDouble(interp, string, doublePtr)

       Tcl_GetBoolean(interp, string, boolPtr)

       Tcl_Interp   *interp      (in)      Interpreter to use for error

       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
                                           converted from string.

       int          *boolPtr     (out)     Points to place to store boolean
                                           value (0 or 1) converted from

       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 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 interp->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.

       boolean, conversion, double, floating-point, integer

Tcl                                                              Tcl_GetInt(3)