ADDM | Android DLNA Device Manager - A demo app | Media library

i have an application that's supposed to do CRUD, very simple. i want to update a book's info but it doesn't work so what should i change ? plus i'm getting this error now :

core.js:6210 ERROR TypeError: Cannot read properties of undefined (reading 'value')

backend code :

So in my Java code for my app I have a class called Pet. A variable of this is created in one of my activities further in my app.

I've so far been able to successfully create an instance of this class and get variables from it in the same activity.

Now I would like to pass that newly created Class variable (pet1) to the rest of my application and use functions like the getPetName() function in my other activities to set the string displayed on buttons and other elements of the application.

This is the Pet class

In my project, I would like to have a global "Filemanager", so that I always access up-to-date information. I have written a nice short example to explain my problem since I don't want to paste my entire code here.

I have two files:
main.py

In this code, On pressing button "CREATE", three buttons "Remove","Btn1","Btn2" are created... On pressing "Remove" button, all the three buttons ("Remove","Btn1","Btn2") should be removed. I tried many ways but I can't find a way to make the new buttons accessible to other functions that are under the same class.

Main Code:

I am currently working on my app. I am using vue v2 I'm trying to create a dynamic table where I can add rows and Sub rows on button click. Currently i can insert row without problem but if 1 cell has long text that took 2 rows it messed up

I am trying to achieve this:

Here is my current result:

I was trying to open some fragment however the app keep crashing I am wondering if it was possible to fix the issue that I got

I just got started with playing around with AngularJS and I would like to build an app, that just adds another person´s name and his/her date of birth. I have got already initial data (2 persons and their date of birth (dob). By writing down the full name and dob and then pressing the add button, I would like to have another person added as well as his/her dob - and this new person should be also listed and visible in the list.

So far I made it that the function creates a new object. But unfortunately I am not able to combine the input data with the new added object in a proper way. Can somebody help me? Maybe there is an easier way to do it

So far I created this:

I've written a program that will continue to print the line printf("1 for Sum, 2 for Multiple, 3 for Newline Print"); until the user inputs a 0 to exit the loop and finish the program successfully. However, when I try inputting a 0 my program just continues to repeat the while loop, and I'm not quite sure as to why. What exactly am I doing wrong?

MAIN

It's a c++ program that takes input for 3*3 matrices and displays the sum and product of those matrices. Now I have improved the program and it's working as expected, so is there anything that can be improved in this program.