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calculator:go

Calculates the value of an expression.

Syntax

<calculator:go 
      value="postfixstring"
      varname="result"/> 

Parameters

value (required)

Input parameter. Postfix expression as a string with the following format:

"opreand1 operand2 ... operandn opchar"

where operand1, operand2, ..., operandn are one or more operands, and opchar is one of the following operator characters or strings:

+	-	*	/	%	=	!=
LT	GT	LTE	GTE	AND	OR	NOT

All values are separated by spaces, and the entire value input string is contained within double quotes.

varname (required)

Input and output parameter. As input, name of a string that holds the output that results from evaluating the expression.

Description

The value is computed using reverse polish notation. Numbers in the expression string are pushed onto a stack. Operations pop numbers off the stack as needed and push the result. The final answer is the top element of the stack.

Each JSP file containing this tag must have the following directive at the top:

<%@ taglib prefix="calculator" uri="futuretense_cs/calculator.tld" %>

Example

<!-- Divide total price by item quantity to get the item price. -->
<calculator:go value="100 20 /" varname="calcout"/>
<!-- Convert the above item price to currency. -->
<currency:create name="currencyxml"/>
<currency:getcurrency name="currencyxml" value="10.08"
varname="gotcurrencyxml"/>

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