Java Assignment: Postfix Expression Calculator
I. The Input
All expressions are stored in a file called "in.dat". The file
contains a sequence of arithmetic expressions in the postfix form,
one per line. For example, the following file has two expressions:
2 3 ^ 35 5 / -
1 2 + 3 * # 4 - 5 6 - + _
There is at least one space to separate the operators and operands.
All operands and values are considered as doubles.
The following are the operators:
+, -, *, / arithmetic operators
_ unary negation
# square root
^ exponentiation (a b ^ = a raised to the power b)
There is a carriage-return at the end of the last expression.
II. The Output
For each expression, your program should print the expression,
calculate its value, and show the result.
III. An example
[lik@wyvern PostfixExpression]$ java PostfixExpression
Hello! This is a postfix expression calculator.
The value of "2 3 ^ 35 5 / -" is 1.0
The value of "1 2 + 3 * # 4 - 5 6 - + _" is 2.0
Bye-bye!
[lik@wyvern PostfixExpression]$
IV. Testing
You need to make a testing data file which contains all kinds of
expressions to test your program thoroughly. It is a good exercise to
design a nice input file.