How to code push button to start a logic gate

Hello guys

I need help coding this start push button to start calculating the logic gates [ Logic gates is already coded and it works only if i entered the input 1st but i need to change that by coding a start button to start the whole procedures ]

i need an example please guys <3

[Jan]

It is not clear, what the problem is. So please explain, what pressing the start button should do. Actually all you need is to insert the code to "start calculating" in the callback of the button.

[youssef ayman]

Thank you for replying,

The problem is only about that all i need is when i click the push button the uneditable output of logic gates shows the value directly after clicking (START)

[youssef ayman]

all i need only to know the concept of how or what is the code should i type it in the callback of this pushbutton to display the values of selected logic gate into the output

[youssef ayman]

Okay how to control a push button in APP DESIGNER