Array - for storing the first value in Qt C++

Jerwinprabu

I have written a Qt C++ code for my project. I am having trouble storing values in arrays. I have written a code for measuring the value from hardware. For storing first value I have used Array, that is working fine. For example when the program get started, I got initial value lets say 53.6854.

Now I want to take this value into another void for comparing with other values. So according to first value, I am going to check remaining values. I can't fix the constant value because Initial value will change every time.

I want to take that first value to void Motion::Synchronization(QString motiontype) else if(type == 2)

Then according to stored first value I will check remaining value. If that is not equal to that value I will create the other logic to reach that position. For that I need first value. I don't know how to change, or else any other ways to get the first value ? Assist me to solve this issue.

void check(float a)
{
    std::cout << a << std::endl;
}


void Motion::Synchronization(QString type)
{
  if(type == 1){
 }
 else if(type == 2)
{
  delay(20);
  }
}

void Motion::slow()
{
    float n[ ] = {Thread::data};
    check(n[0]);
}

jsulm

@Jerwinprabu I don't understand the problem: you get the first value from an array using 0 as index as you do already:

check(n[0]);

So, what is the problem?

jsulm

@Jerwinprabu I moved your question to "C++ Gurus" forum as it isn't related to Qt but to C++.

Jerwinprabu

@jsulm How can I take that stored value from Here

void Motion::slow()
{
    float n[ ] = {Thread::data};
    check(n[0]);
}

to

else if(type == 2)
{
 delay(20);
 }

Daniil Chernyshev

@Jerwinprabu Not sure if I fully understand your problem, but why can't you create a local class variable for the value you need?

SGaist

Hi,

To add to @Daniil-Chernyshev, why are you creating an array of one element to immediately take the first element ?

Jerwinprabu

@SGaist Ya exactly. It's not required to create Array. Simply store the first value, and taken the first value to next function. Ya, problem solved.

Jerwinprabu

@Daniil-Chernyshev Because Each and every time value will update from hardware, so for every 5 milli second will get new value. In that same thread only I need first value and real time value.