Final answer:
To share a variable value across all instances of a class, you would use a class variable, often marked with the static keyword. This variable is declared inside the class but outside any methods and is accessed through the class name itself.
Step-by-step explanation:
To ensure that a variable value is shared between all instances of a class, you would use a class variable in programming. A class variable is shared by all instances of the class, meaning that it holds the same value for every instance. This is different from an instance variable, which can have a different value for each instance of the class.
In object-oriented languages like Python, Java, or C++, class variables are typically declared inside the class but outside of any methods, and are often marked with the static keyword (except in Python). Access to these variables is through the class name itself, rather than through a specific object.
For example, in Java:
class Example {
static int sharedVariable = 0;
}
Every object of the Example class will see the same value of sharedVariable. If one object changes the value, the new value will be visible to all other instances.