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Modify the expression calculator given below to convert an expression into reverse Polish notation. Hint: Instead of evaluating the top and pushing the result, append the instructions to a string.
Here is the algorithm:
If you read a number Push it on the number stack. Else if you read a ( Push it on the operator stack. Else if you read an operator op While the top of the stack has a higher precedence than op Evaluate the top. Push op on the operator stack. Else if you read a ) While the top of the stack is not a ( Evaluate the top. Pop the (. Else if there is no more input While the operator stack is not empty Evaluate the top.
Evaluate the top: Pop two numbers off the number stack. Pop an operator off the operator stack. Combine the numbers with that operator. Push the result on the number stack.
When the stage of glaucoma is indeterminate, the seventh character marked as "4" is used.
The excerpt is from the ICD-10 guidelines. It refers to how to report the stage of glaucoma with regards to the documentation that is available. The seventh character "4" should be used when the stage of glaucoma cannot be determined. This should be confused with the character "0", which refers to the unspecified stage of glaucoma.
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