What Is a Global Variable? A computer program is, essentially, a list of instructions for a computer to carry out when you ...

For this reason evolved languages (C, Java) are typed languages,meaning that a variable is not only associated with a name but also a data type, which should be specified when declaring the variable, ...

The :String attached to the variable's name tells the computer what type of variable it is and to not accept any other type. This is the reason for the term strictly-typed .

For example, a variable can be used in the program that controls an automatic car park barrier. It can keep track of the number of cars going in and out and decide whether to let more cars in.