Pointer Variables   The variable that is used to hold the memory address of another variable is called a pointer variable or simply a pointer.   The data type of the variable (whose address a pointer is to hold) and the pointer variable must be the same. A pointer variable is declared by placing an asterisk (*) after data type or before the variable name in the data type statement.   For example,... 

Concepts Development of theory is an essential process of describing facts at higher abstraction level. The generalized idea about a class of objects, attributes, processes or occurrences that have given a name is called concept. Such names are being developed for identification of a phenomenon. They may be considered as empirical realities, for example productivity, leadership, motivation, moral,...