How change a Variable from another class

[Codmasters]

Hi
I am kind of a newbee in Qt.
I have a Class a which has a Bool variable like
Class A:

bool cont = false ;

now I want to change the variable to true in another class
Class B:

Class_a temp;
temp.cont = true;

but when I call the variable in class C it still give me "FALSE"
Class C:

Class_a temp;
qDebug() << temp.cont;

the code gives me "False" instead of TRUE

[KroMignon]

@Codmasters said in How change a Variable from another class:

the code gives me "False" instead of TRUE

This has nothing to do with Qt, first try to learn C++, there are many online trainings available.