modify value inside array of struct

Greetings from a new member. I am so glad that I found this forum, which is an excellent source for learning. Can someone help me with this task:


I have an array of structs:

Code:

---

typedef struct {
    int id;
    String topic;
    float value;
}myStruct;


// then create array of struct and add some values
myStruct myArray []= {
    {1, "topic1", 26},
    {2, "topic2", 27},
    {3, "topic3", 31},
 
};

---

In rest of my code I have another varibales with fresh value (it changes in a certain period of time), lets say float topic1freshvalue....
What I'm trying to do, but I don't know if it's possible, is to create a pointer inside the structure (*myStruct.value) that will point to the variable outside, let say ptr-variable, then to assign a value, IE
myarray[0].mystruct.value=ptr-variable
topic1freshvalue=ptr-variable:


so that whenever the topic1freshvalue variable changes its value, the same is reflected on the value in the structure.
In short, I want to change the value of topic1 from 26 to new value that hold topic1freshvalue float variable.

To be honest, you should find a way that doesn't involve pointers.

It's not that pointers can't be used - they can.
But if you mess it up (and you will), trying to debug a pointer mess is hard work.

Code:

---

void updateByID(int id, float value) {
  // search myArray for matching id
}

void updateByTopic(String topic, float value) {
  // search myArray for matching topic
}

---

So that when you update topic1freshvalue, you call a function.

Code:

---

updateByID(1,topic1freshvalue);
/// or
updateByTopic("topic1",topic1freshvalue);

---

Thanks a lot Salem, actually that's the advice I was looking for, I was on the wrong track with pointers.
The most important thing is to find the correct way to solve a problem.
I followed your advice completely and made a function (only three lines) that refreshes the value when necessary. Now the complete code works great.