Postfix notation Program plan: Import the required packages into the program. In the Exercise20_14 class, In the main() method, Check length of the argument. If yes, display the error message. Declare the variable. The for loop executes until the length of arguments. If yes, evaluate the expression. In try block, call evaluateExpression() method by passing the input expression. In catch, block, catch the exception. In the evaluateExpression() method. Create an object for Stack. Extract operands and operators. The while loop executes until token to scan the expression. If yes, Extract an expression. Check whether the length of expression is equal to 0. If yes, continue the code. Otherwise, check the expression. If yes, call processAnOperator() method. Otherwise, Call push() method to push an operand into stack. Return the result. In the processAnOperator() method. Check whether operator. If yes, perform the addition operation and push the result to stack. Otherwise, check whether operator. If yes, perform the subtraction operation and push the result to stack. Otherwise, check whether operator. If yes, perform the multiplication operation and push the result to stack. Otherwise, check whether operator. If yes, perform the division operation and push the result to stack.

Question

Want to see the full answer?

Answer 1

Question

Chapter 20, Problem 20.14PE

Program Plan Intro

Postfix notation

Program plan:

Import the required packages into the program.

In the Exercise20_14 class,

In the main() method,

Check length of the argument. If yes, display the error message.

Declare the variable.

The for loop executes until the length of arguments. If yes, evaluate the expression.

In try block, call evaluateExpression() method by passing the input expression.

In catch, block, catch the exception.

In the evaluateExpression() method.

Create an object for Stack.

Extract operands and operators.

The while loop executes until token to scan the expression. If yes,

Extract an expression.

Check whether the length of expression is equal to 0. If yes, continue the code.

Otherwise, check the expression. If yes, call processAnOperator() method.

Otherwise, Call push() method to push an operand into stack.

Return the result.

In the processAnOperator() method.

Check whether operator. If yes, perform the addition operation and push the result to stack.

Otherwise, check whether operator. If yes, perform the subtraction operation and push the result to stack.

Otherwise, check whether operator. If yes, perform the multiplication operation and push the result to stack.

Otherwise, check whether operator. If yes, perform the division operation and push the result to stack.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

3. Problem Description: Define the Circle2D class that contains: Two double data fields named x and y that specify the center of the circle with get methods. • A data field radius with a get method. • A no-arg constructor that creates a default circle with (0, 0) for (x, y) and 1 for radius. • A constructor that creates a circle with the specified x, y, and radius. • A method getArea() that returns the area of the circle. • A method getPerimeter() that returns the perimeter of the circle. • • • A method contains(double x, double y) that returns true if the specified point (x, y) is inside this circle. See Figure (a). A method contains(Circle2D circle) that returns true if the specified circle is inside this circle. See Figure (b). A method overlaps (Circle2D circle) that returns true if the specified circle overlaps with this circle. See the figure below. р O со (a) (b) (c)< Figure (a) A point is inside the circle. (b) A circle is inside another circle. (c) A circle overlaps another…

1. Explain in detail with examples each of the following fundamental security design principles: economy of mechanism, fail-safe default, complete mediation, open design, separation of privilege, least privilege, least common mechanism, psychological acceptability, isolation, encapsulation, modularity, layering, and least astonishment.

Security in general means the protection of an asset. In the context of computer and network security, explore and explain what assets must be protected within an online university. What the threats are to the security of these assets, and what countermeasures are available to mitigate and protect the organization from such threats. For each of the assets you identify, assign an impact level (low, moderate, or high) for the loss of confidentiality, availability, and integrity. Justify your answers.