A postfix expression evaluator works on arithmetic statements that take this form: op1 op2 operator . . . Using two stacks, one for the operands and one for the operators, design and implement a Calculator class that converts infix expressions to postfix expressions and then uses the stacks to evaluate the expressions.
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. A postfix expression evaluator works on arithmetic statements that take
this form: op1 op2 operator . . . Using two stacks, one for the operands
and one for the operators, design and implement a Calculator class that
converts infix expressions to postfix expressions and then uses the stacks
to evaluate the expressions.
Step by step
Solved in 4 steps with 2 images
- Design and implement an application that reads a sentence fromthe user and prints the sentence with the characters of each wordbackwards. Use a stack to reverse the characters of each word.8. Pop the infix expression off the stack and print it.Answer the given question with a proper explanation and step-by-step solution. Hello team, Need some help with problems below using the langauge JAVA. I need to modify the CalcParser class provided below. I need this to produce a string containing commands to evaluate the expression on a stack machine. For example, if you give the command java CalcParser 1+2*3, the output should be a sequence of stack commands such as this: push 1.0 push 2.0 push 3.0 multiply add 7.0 For the command java CalcParser (1+2)*3, on the other hand, it should print a sequence like this: push 1.0 push 2.0 add push 3.0 multiply 9.0 CODE:public class CalcParser { private CalcLexer lexer; private String errorMessage = null; private double value; public CalcParser(String s) { lexer = new CalcLexer(s);errorMessage = lexer.getErrorMessage();if (errorMessage != null) return; value = parseExpression();if (errorMessage != null) return; match(CalcLexer.EOLN_TOKEN);if (errorMessage != null) return; } public String…Im trying to figure out a java homework assignment where I have to evaluate postfix expressions using stacks and Stringtokenizer as well as a isNumber method. when I try to run it it gives me an error. this is the code I have so far: static double evaluatePostfixExpression(String expression){ // Write your code Stack aStack = new Stack(); double value1, value2; String token; StringTokenizer tokenizer = new StringTokenizer(expression); while (tokenizer.hasMoreTokens()) { token = tokenizer.nextToken(); if(isNumber(expression)) { value1 = (double)aStack.pop(); value2 = (double)aStack.pop(); if (token.equals("+")) { aStack.push(value2+value1); } else if (token.equals("-")) { aStack.push(value2-value1); } else if (token.equals("*")) { aStack.push(value2*value1); } else if (token.equals("/")) { aStack.push(value2/value1); } } }…
- My last question was not answered so I am trying again. Please solve this problem in Java. Please a create Java class that does the Pop() operation on a stack as described in the image below. The class will need to read the integers from the text file and Text file(Stack_Ints.txt): 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Sample Output: Print: stack elements print: Popped element print: updated stack elementsJava ProgramI will give an upvote to one that can help me. Instructions:- Create a java program using the concept of PDA (Push Down Automata) - This program will check if the input is a palindrome or a balanced symols. - It must use a stack way- Make it simple as possible Take note: You can copy from google but modify it to satisfy the needs of the student. Thank you so much!Design and implement an application that reads a sentence fromthe user and prints the sentence with the characters of eachword backwards. Use a stack to reverse the characters of eachword.
- Java Programming Hello! Can you make an algorithm / code for this part for my java calculator application. (see attached photo) All basic operations are already working, only the M's are needed to be implemented. Contains 'M+', 'M-', 'MC', 'MR' buttons(used to temporarily store data) with the corresponding stack functionalities as follows: 'M+' is push 'M-' is pop 'MC' is clear stack 'MR' is peakjava /* Practice Stacks and ourVector Write a java program that creates a stack of integers. Fill the stack with 30 random numbers between -300 and +300. A)- With the help of one ourVector Object and an additional stack, reorganize the numbers in the stack so that numbers smaller than -100 go to the bottom of the stack, numbers between -100 and +100 in the middle and numbers larger than +100 in the top (order does not matter) B)- (a little harder) Solve the same problem using only one ourVector object for help C)- (harder) Solve the same problem using only one additional stack as a helper */ public class HWStacks { public static void main(String[] args) { // TODO Auto-generated method stub } }Draw a memory map for the code you see on the next page, until the execution reaches the point indicated by the comment /* HERE */.In your diagram:• You must have a stack, heap, and static memory sections • Identify each frame as illustrated by the previous examples.• Draw your variables as they are encountered during program execution. Code: public class Passenger {private String name;private int ticketCost;private StringBuffer luggage;private static final int LUGGAGE_COST = 20;public Passenger(String name, int ticketCost) {this.name = name;this.ticketCost = ticketCost;luggage = new StringBuffer();}public Passenger addLuggage(String desc) {ticketCost += LUGGAGE_COST;luggage.append(desc);return this;}public int getTicketCost() {return ticketCost;}public Passenger reduceCost(int by) {ticketCost -= by;/* HERE */return this;}public String toString() {return "Passenger [name=" + name + ", ticketCost=" + ticketCost + ", luggage=" + luggage + "]";}}public class Driver {public static void…
- OCaml Code: The goal of this project is to understand and build an interpreter for a small, OCaml-like, stackbased bytecode language. Make sure that the code compiles correctly without any errors and provide the code with the screenshots of the outputs. The code must have a function that takes a pair of strings (tuple) and returns a unit. Make sure to have the following methods below: -Push integers, strings, and names on the stack -Push booleans -Pushing an error literal or unit literal will push :error: or :unit: onto the stack, respectively -Command pop removes the top value from the stack -The command add refers to integer addition. Since this is a binary operator, it consumes the top two values in the stack, calculates the sum and pushes the result back to the stack - Command sub refers to integer subtraction where if top two elements in the stack are integer numbers, pop the top element(y) and the next element(x), subtract y from x, and push the result x-y back onto the stack…Please answer the following question in Python code: Inheritance (based on 8.38) You MUST use inheritance for this problem. A stack is a sequence container type that, like a queue, supports very restrictive access methods: all insertions and removals are from one end of the stack, typically referred to as the top of the stack. A stack is often referred to as a last-in first-out (LIFO) container because the last item inserted is the first removed. Implement a Stack class using Note that this means you may be able to inherit some of the methods below. Which ones? (Try not writing those and see if it works!) Constructor/_init__ - Can construct either an empty stack, or initialized with a list of items, the first item is at the bottom, the last is at the top. push() – take an item as input and push it on the top of the stack pop() – remove and return the item at the top of the stack isEmpty() – returns True if the stack is empty, False otherwise [] – return the item at a given…The process of removing an element from stack is called (java)__________ a. Remove b. Push c. Serve d. Pop