simpleStorage | browser key-value store database | JSON Processing library

Really strange issue, i'm using SimpleStorage but i've gone down to the actuall IO, i'm using Android 11 heres the issue:

1. createNewFile in app and write it to downloads folder etc., no problem
2. open samsung filemanager, delete file
3. repeat step 1: createNewFile on same path/filename

step 1 works without a problem (rules out access/permission issue), but at step 3 createNewFile returns false and if i debug i get these evaluated return values

I am actually learning smart contract programming on ethereum and I work with truffle. Right now I am making this tutorial here: https://truffleframework.com/tutorials/building-dapps-for-quorum-private-enterprise-blockchains

Where you learn how to create a dapp with quorum. But now I have a problem.

I did everything exactly as described, but when I do:

I try to passing code {array} from one page to another,

this is my code:

I'm relatively new to React and creating a ToDoList style Recipe App. The user should be able to add new recipes to the list as well as delete or edit existing recipes.

I ran into an issue getting the ingredients to display on separate lines and asked this question on how to do that. The end result was that I added a second .map function within my container to iterate through ingredients and display each one as a new paragraph element. Here is my container, Item.js:

I followed the tutorial of quorum with truffle: https://truffleframework.com/tutorials/building-dapps-for-quorum-private-enterprise-blockchains

Now I want to migrate the SimpleStorage.sol Smart Contract to the blockchain, but I want to make it to add the "PrivateFor" parameter.

This is my Smart Contract:

One of the much appraised features of blockchain among other things is traceability of data stored on the blockchain priced on records being immutable i think.

I am trying to find out how state changes can be traced practically on the ethereum blockchain. To explain my question, take the following smart contract as example

When I created a 2 nodes private network with POA consensus and it works fine when I sent a simple transaction. But when I deploy a simple contract SimpleStorage.sol with Truffle, I want to call the get() method by using the myetherwallet, but it returns 0 , not 100.

The detailed of SimpleStorage is as shown below:

I created a Ethereum smart contract with remix IDE and metamask for the ethereum ropsten network. The smart contract is created and transactions are made. But the events does not log any Events.

The code for generating smart contract is shown below.

I just wrote a simple code to test openzeplin Safemath library. I am using the latest version of remix ide and compiling for ^0.5.0. Remix is using 0.5.0_commit.1d4f565a compiler The environment is JavaScript VM EVM Version is the compiler default

The add function does not seem to be working in the code given below

I have tried x.sub(1) it throws an exception as expected, i have also tried initializing x to different values but still does not work.