Object Oriented Programming with C++, Second Edition

2.3 CONSTANTS AND VARIABLES DECLARATIONS

The most basic element of a program is a variable. As the name suggests, its value can be varied. Every variable has to be declared before its use. The declaration of a variable takes the following form:

<type> <variable name> ;

A typical example being

int mymarks ;

At this point in a program, a memory is assigned to this variable. As memory contains the arbitrary value, it is a good idea to initialize a variable at the time of declaration.

int mymarks =99;

If there are any variables of the same type, we can combine the declaration as shown below:

int i, j, k;

When we initialized the variable, we used a quantity 99. It is a constant quantity. In correct grammatical term, it is called a literal. Let us ...