Step 4: Implement GroceryList's execute_undo() method Implement GroceryList's execute_undo() method to do the following: • Pop an UndoCommand off the undo stack • Execute the popped undo command File main.py has code that reads in a list of commands, one per line, that allow for basic testing of basic operations. So after implementing execute_undo(), run your program with the following input: add bananas add grapes add strawberries print undo print undo print quit Verify that the corresponding output is: 0. bananas 1. grapes 2. strawberries 0. bananas 1. grapes 0. bananas The program's output does not affect grading, so additional test cases can be added, if desired. Submitting code written so far to obtain partial credit is recommended before proceeding to the next step. Step 5: Implement the SwanCommand class and Groceryl ist's swan with unde method

In Java Integer in is read from input. Write a while loop that iterates until in is less than or equal to 0. In each iteration: Update in with the quotient of in and 7. Output the updated in, followed by a newline.     Click here for exampleEx: If the input is 2401, then the output is:   343 49 7 1 0   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17     import java.util.Scanner;   public class QuotientCalculator { publicstaticvoidmain(String[] args) { Scannerscnr=newScanner(System.in); intin;   in=scnr.nextInt(); /your code here/ } }

Write a program that obtains the executiontime of external sorts for integers of size 6,000,000, 12,000,000, 18,000,000,24,000,000, 30,000,000, and 36,000,000. Your program should print a tablelike this:

Can you help me write the code for this one please? Thank you

Use stacks to implement a postfix-to-infix translator. Until the user closes the programme, it should continually read a postfix expression and output the identical infix expression. If the postfix expression entered is incorrect, throw an exception.

Review Loops Write a java program to ask three people three questions about name, number of courses, and number of credit hours. Also, print result in columns as below. Note:  the input.nextInt() method reads only the integer value from input buffer.The "\n" is still staying in the input buffer.  If you continue reading with input.nextLine(),you will receive the "\n" and CPU will not wait for any input. To fix this problem, you addthe statement input.nextLine() to flush out the "\n" from the input buffer.

A controlled transaction solution for Joe's Pizza, your friendly neighborhood pizza shop.Joe only make $200 worth of pizza everyday. Modify your program so that if the running total will exceed $200, print a warning and DO NOT add this value to running total. Instead, go to the beginning of loop statement block and wait for next transaction.   can you please write it in import java.util.Scanner;  and can you make it so i can copy and past it. thank you in advance the code from before  /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */package personal;import java.util.Scanner;/** * * @author Mabda */public class Personal {    /**     * @param args the command line arguments     */    public static void main(String[] args) {         int num, sum = 0;        char choice;        Scanner key = new Scanner(System.in);        while (true) {…

This code has a delay in the loop, during which time the user inputs will be ignored. So, please modify it and implement a solution that would trigger the needed function when there is an input.    // Pin numbers written on the board itself do not correspond to Aurdino pinnumbers.Constants are defined to make using this board easierconst uint8_t BTN_PIN = 2;const uint8_t LED_PIN = 13;//assigning button;s previous state and LedSate to LOWuint8_t buttonPrevState = LOW;uint8_t ledState = LOW;//defining a new functionvoid setup(){// Assigning the types of input parameterspinMode(BTN_PIN, INPUT_PULLUP);//Assigning the types of output parameterspinMode(LED_PIN, OUTPUT);//begin of process detailsSerial.begin(9600);}void loop(){//assigning button state to be read modeuint8_t buttonState = digitalRead(BTN_PIN); //To print the following in output windowSerial.print(buttonState);Serial.print(buttonPrevState);Serial.print(ledState);Serial.println(""); //check if the button state presently is same…

/*TASK 5. Implement part 1 of the report.  You need to read data from input.txt file, store it into array of items (called items) and write it in a formatted form to the output file. Code, debug and present it in the best possible format. Hint: It might be helpful to format the String coming from toString( ) method using String.format( ) method, which works similar to System.out.prinf. Hint2: You might have to close and delete existing output .doc or .txt file from its folder * public class YourUserName_hw7 {    static Item [ ] items = new Item [200];//an array of Items    static EdibleItem [ ] edibleItems;//an array of Edible Items    static int countEdibleitems = 0;//count edible items    static String pageHeader; //save the header            //main( ) method runs the program    public static void main(String[ ] args) throws FileNotFoundException {       double sum = 0, average = 0;       //Optional - create a new input file        //CreateInput.createInputFile( );…

It is a python program. Make sure it works and run in IDLE 3.10. Please show the code screenshot and output screenshot.