Infix to postfix expression Program plan: Import necessary packages. Create a class “InfixToPostfix”, Define the method “is_Operator ()” that accepts token as parameter, Execute switch statement, Match for the operators “+”, “-“, “”, “/”, “^”, and, “%”. Return “true”. By default, Return “false”. Define the method “operator_Precedence()”, Check whether the infix operator is “^”, Return “true”. Otherwise, check whether the right operator is “^”, Return “false”. Otherwise, check whether the infix operator is either “” or “/” or “%”, Return “true”. Otherwise, check whether the right operator is either “*” or “/” or “%”, Return “false”. Return “true”. Define the method “convert_InfixToPostfix()”, Declare the empty string variable. Construct stack object. Insert “(“ into stack. Execute till expression length, Read character at the “i” position. Check whether the character is a space, Do nothing. Otherwise check whether the character is either digit or “.” or letter, Update the postfix expression. Check whether the letter is “(“, Insert into the stack. Check whether letter is any operator, Assign to the right operator. Execute while loop, Updates postfix expression with space and character. Updates postfix expression with space. Check for “)”, Execute while stack is non-empty, Updates postfix expression with space and characters. Remove top of the stack. Remove “(“. Updates postfix expression with space. Otherwise, Print invalid expression message. Break to exit the loop. Execute while top of stack is not a “(“, Updates postfix expression with space and character. Remove top of stack. Return postfix expression. Define the method “main()”, Construct object for “InfixToPostfix” class. Create “Scanner” object. Prompt the user to enter infix expression. Get the infix expression from the user. Call the method “convert-InfixToPostfix()”. Print the postfix expression.

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Chapter 14, Problem 3PP

Program Plan Intro

Infix to postfix expression

Program plan:

Import necessary packages.

Create a class “InfixToPostfix”,

Define the method “is_Operator ()” that accepts token as parameter,

Execute switch statement,

Match for the operators “+”, “-“, “”, “/”, “^”, and, “%”.

Return “true”.

By default,

Return “false”.

Define the method “operator_Precedence()”,

Check whether the infix operator is “^”,

Return “true”.

Otherwise, check whether the right operator is “^”,

Return “false”.

Otherwise, check whether the infix operator is either “” or “/” or “%”,

Return “true”.

Otherwise, check whether the right operator is either “*” or “/” or “%”,

Return “false”.

Return “true”.

Define the method “convert_InfixToPostfix()”,

Declare the empty string variable.

Construct stack object.

Insert “(“ into stack.

Execute till expression length,

Read character at the “i” position.

Check whether the character is a space,

Do nothing.

Otherwise check whether the character is either digit or “.” or letter,

Update the postfix expression.

Check whether the letter is “(“,

Insert into the stack.

Check whether letter is any operator,

Assign to the right operator.

Execute while loop,

Updates postfix expression with space and character.

Updates postfix expression with space.

Check for “)”,

Execute while stack is non-empty,

Updates postfix expression with space and characters.

Remove top of the stack.

Remove “(“.

Updates postfix expression with space.

Otherwise,

Print invalid expression message.

Break to exit the loop.

Execute while top of stack is not a “(“,

Updates postfix expression with space and character.

Remove top of stack.

Return postfix expression.

Define the method “main()”,

Construct object for “InfixToPostfix” class.

Create “Scanner” object.

Prompt the user to enter infix expression.

Get the infix expression from the user.

Call the method “convert-InfixToPostfix()”.

Print the postfix expression.

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