Tcl_ExprDouble man page on OpenServer

Man page or keyword search:  
man Server   5388 pages
apropos Keyword Search (all sections)
Output format
OpenServer logo
[printable version]

Tcl_ExprLong(3)		    Tcl Library Procedures	       Tcl_ExprLong(3)

______________________________________________________________________________

NAME
       Tcl_ExprLong,  Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString - evalu-
       ate an expression

SYNOPSIS
       #include <tcl.h>

       int
       Tcl_ExprLong(interp, string, longPtr)

       int
       Tcl_ExprDouble(interp, string, doublePtr)

       int
       Tcl_ExprBoolean(interp, string, booleanPtr)

       int
       Tcl_ExprString(interp, string)

ARGUMENTS
       Tcl_Interp   *interp	  (in)	    Interpreter in  whose  context  to
					    evaluate string.		       |

       CONST								       |
       char   *string	    (in)					 |     |
					    Expression to be evaluated.

       long	    *longPtr	  (out)	    Pointer to location	 in  which  to
					    store  the	integer	 value	of the
					    expression.

       int	    *doublePtr	  (out)	    Pointer to location	 in  which  to
					    store  the floating-point value of
					    the expression.

       int	    *booleanPtr	  (out)	    Pointer to location	 in  which  to
					    store the 0/1 boolean value of the
					    expression.
_________________________________________________________________

DESCRIPTION
       These four procedures all evaluate the expression given by  the	string
       argument	 and  return  the  result in one of four different forms.  The
       expression can have any of the forms  accepted  by  the	expr  command.
       Note  that  these  procedures have been largely replaced by the object-
       based   procedures   Tcl_ExprLongObj,   Tcl_ExprDoubleObj,    Tcl_Expr-
       BooleanObj, and Tcl_ExprObj.  Those object-based procedures evaluate an
       expression held in a Tcl object instead of a string.  The object	 argu-
       ment  can  retain  an internal representation that is more efficient to
       execute.

       The interp argument refers to  an  interpreter  used  to	 evaluate  the
       expression  (e.g.  for variables and nested Tcl commands) and to return
       error information.

       For all of these procedures the return value is a standard Tcl  result:
       TCL_OK  means  the expression was successfully evaluated, and TCL_ERROR
       means that an error  occurred  while  evaluating	 the  expression.   If
       TCL_ERROR is returned then the interpreter's result will hold a message
       describing the error.  If an error occurs while executing a Tcl command
       embedded in the expression then that error will be returned.

       If the expression is successfully evaluated, then its value is returned
       in one  of  four	 forms,	 depending  on	which  procedure  is  invoked.
       Tcl_ExprLong  stores an integer value at *longPtr.  If the expression's
       actual value is a floating-point number, then it	 is  truncated	to  an
       integer.	 If the expression's actual value is a non-numeric string then
       an error is returned.

       Tcl_ExprDouble stores a floating-point value  at	 *doublePtr.   If  the
       expression's  actual  value is an integer, it is converted to floating-
       point.  If the expression's actual value is a non-numeric  string  then
       an error is returned.

       Tcl_ExprBoolean	stores	a  0/1	integer	 value at *booleanPtr.	If the
       expression's actual value is an integer or floating-point number,  then
       they  store 0 at *booleanPtr if the value was zero and 1 otherwise.  If
       the expression's actual value is a non-numeric string then it  must  be
       one of the values accepted by Tcl_GetBoolean such as ``yes'' or ``no'',
       or else an error occurs.

       Tcl_ExprString returns the value of the expression as a	string	stored
       in the interpreter's result.

SEE ALSO
       Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj

KEYWORDS
       boolean, double, evaluate, expression, integer, object, string

Tcl				      7.0		       Tcl_ExprLong(3)
[top]
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
More information is available in HTML format for server OpenServer

List of man pages available for OpenServer

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net