DOKK / manpages / debian 12 / tcl8.6-doc / Tcl_GetDouble.3tcl.en
Tcl_GetInt(3tcl) Tcl Library Procedures Tcl_GetInt(3tcl) 







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, intPtr)









  
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.
    
    

    

  










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.










boolean, conversion, double, floating-point, integer







  

    
    Tcl