Changeable | Follow in details changes in an object | Object-Relational Mapping library

What am I doing wrong here? The prototypes aren't changeable. I need to write both of the functions and this is what I wrote. They work at 90% of the times. The iterative way got an issue when i'm trying to search for the middle element.

And the recursive way got some issue but I don't really know what's wrong. Sometimes it finds the element and other times not.

One more thing I cannot change it's that I must avoid checking inside of the function whether array[middle] == key. The teacher wants us to do this check only when I exit the loop, and he wants the loop to only check if should I go right or left.

In my code, there is some pre-written part that is not changeable. when I return a list from the method and in the main function it is not getting the updated list. when I try to print, it prints old list values please help me to return the updated list to the main function

I'm super new to React.js. I'm making changeable layouts using React.js. so i tried to use useState for rendering specific layout that I should click. so I tried to add setState for changing false in a function and made one another setState in the same function. but Too many re-renders Error came out. so what can i use for making changeable layout??

this is my code

I am creating the List of Cards according to the number of toDoId.

toDoController.toDo() is like

Recently I am working on a beginner projects. But I was stuck for days without knowing how to update a file. Then I found I can do it with binary files, so I started using binary files instead of normal files. But now when I write into binary files it works (I assume), but when I read from it, it gives me segmentation fault (core dumped).

Here is my structs

For Example I have String like this:

""dear customer{Customer name} your reference number is {referenceNumber}"

I want to get array=["{Customer name}",{referenceNumber}]"

I have to split based on curly bracket inside bracket value is changeable means it can be different for different cases I just need to split and get array of value inside brackets including brackets.

Let's say I have a class A

I want to make Siren sound which's frequency changing 960Hz and 770Hz every 0.65sec. (in 8sec Wav file) But I have no idea how to build function as I write above. I tried to use 'for(...=0; ... < 0.65; ...++)' every period. But y[0] and y[1] are function, so I'm confused. My final goal is to make siren wav sound, which come from right side to left side.

To say to the point, I want to know how to make frequency changeable 960Hz and 770Hz every 0.65 sec. I'll be thankful to you if you give me advice to achieve my final goal.

As I'm not good at English, if you're hard to understand my Question, plz comment me.

I have a dataset like this for each ID;

And I want a column like AnnualSalaryChangeSumFor12Months. It should be cumulative sum of AnnualSalaryChange values for last 12 months(changeable) for each row. For each row it should go back 12 months ago and sum the values up to that time. If there are no 12 rows to sum, it can sum the remaining rows.

I tried;