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1.1     ! root        1: '\" Copyright 1989 Regents of the University of California
        !             2: '\" Permission to use, copy, modify, and distribute this
        !             3: '\" documentation for any purpose and without fee is hereby
        !             4: '\" granted, provided that this notice appears in all copies.
        !             5: '\" The University of California makes no representations about
        !             6: '\" the suitability of this material for any purpose.  It is
        !             7: '\" provided "as is" without express or implied warranty.
        !             8: '\" 
        !             9: '\" $Header: /sprite/src/lib/tcl/RCS/Tcl_Expr.man,v 1.2 89/03/24 14:16:11 ouster Exp $ SPRITE (Berkeley)
        !            10: '\" 
        !            11: .so \*(]ltmac.sprite
        !            12: .HS Tcl_Expr tcl
        !            13: .BS
        !            14: .SH NAME
        !            15: Tcl_Expr \- evaluate an expression
        !            16: .SH SYNOPSIS
        !            17: .nf
        !            18: \fB#include <tcl.h>\fR
        !            19: .sp
        !            20: int
        !            21: \fBTcl_Expr\fR(\fIinterp, string, valuePtr\fR)
        !            22: .SH ARGUMENTS
        !            23: .AS Tcl_Interp *interp
        !            24: .AP Tcl_Interp *interp in
        !            25: Interpreter in whose context to evaluate \fIstring\fR.
        !            26: .AP char *string in
        !            27: Expression to be evaluated.
        !            28: .AP int *valuePtr out
        !            29: The expression's (integer) value will be stored here.
        !            30: .BE
        !            31: 
        !            32: .SH DESCRIPTION
        !            33: .PP
        !            34: \fBTcl_Expr\fR is a utility procedure used by several of the Tcl commands.
        !            35: Given a string whose contents are an expression of the form
        !            36: accepted by the \fBexpr\fR command, this procedure evaluates
        !            37: the expression and returns the integer result in \fI*valuePtr\fR.
        !            38: Normally \fBTcl_Expr\fR returns \fBTCL_OK\fR as its result.  However, if
        !            39: the expression contains a syntax error then Tcl_Expr
        !            40: returns \fBTCL_ERROR\fR and sets \fIinterp->result\fR to point
        !            41: to an error message in the usual fashion.
        !            42: \fBTcl_Expr\fR may make nested calls to \fBTcl_Eval\fR while parsing the
        !            43: expression;  if any of these calls returns an error then
        !            44: \fBTcl_Expr\fR will return that same error information.  If an error
        !            45: is returned, then \fI*valuePtr\fR will not be modified.
        !            46: 
        !            47: .SH KEYWORDS
        !            48: evaluate, expression

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