Write some Software

do not use any auxiliary data structures (in particular, do not

use a stack).

or array

Write a recursive method, eval, to evaluate a postfix expression. The expression

is represented as a String and contains the following operators: +, -, * and /.

For simplicity, assume that all the numbers are single digit and unsigned, for

instance 5, or 6 but not 23, 124 or -4. An example of an input is: ”873-*4+23-


Write a recursive method, infix, to transform a postfix expression into an infix

one. Use the same assumptions as in the previous question. For simplicity, put

all operation between parentheses. For instance, the postfix expression ”23+”

is transformed to ”(2+3)”, and ”873-*4+23-*58-+” is transformed to ”((((8*(7-


Evner: Java

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