Object-oriented programming uses public and private modifiers to show or hide information. Dynamic variables are fluid and can change, while static variables are fixed. Vending machines use dynamic variables to track product quantity. Good practice is to name variables according to their purpose.
In object-oriented programming, an object can hide or reveal its attributes, or state, and behaviors, or methods. An object can be tagged with “public” or “private” modifiers to show or hide information, respectively. Both “private” and “public” are variables, but they are different kinds of variables. The “public” modifier is a dynamic variable, which means that the execution of information at runtime of a program is smooth.
All object data and methods are, by default, dynamic in object-oriented programming. Each object in a program has its own dynamic variable and dynamic method. That is to say, the execution of each object is fluid at runtime and may change when you run the program again. This is done in contrast to static variables, as the static variable is allocated in fixed memory for the duration of the program. That is to say that once the variable is allocated to memory space, it is not destroyed at the end of a function.
A dynamic variable can be used to collect field values for later use. The program can use a threshold limit value and compare it with a certain processed field value. Different sets of operations are performed on the field values, depending on whether the value is less or greater than its threshold limit value. A dynamic variable is distinguishable from other variables in that its threshold value can change over the life of a program.
Static variables and dynamic variables are differentiated in that the values of the variables are fixed or fluid, respectively. Static variables are similar to constants in mathematics, such as the immutable value of (pi). Dynamic variables, on the other hand, do not have a constant value and therefore can change a threshold value.
Vending machines are examples of machines that run programs with dynamic variables. The amount of product in a vending machine is constantly changing as it is dispensed from the machine. This quantity is a dynamic variable, and because its value is constantly changing, a program keeps track of the value to determine if the machine needs to be recharged.
When programming variables, including dynamic variables, it’s a good practice to name the variable according to the method of the object or what it does in the program. For example, if there is a certain variable that takes into account shoe size, it might be named “shoe_size”. It is also normal practice to start the dynamic variable with a lowercase letter and place an underscore between multiple words.
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