Define Variables

 Variable declaration:
Syn: datatype variable;

Ex: int x;

Variable declaration along with initialization:
Syn: datatype variable=value;

Ex: int x=10;

Multiple Variable declaration:
Syn: datatype variable1, variable2, variable3,…;

Ex: int x,y,z;

Note:
     When we declare any variable, it should be assigned to a value before its usage.Otherwise, it causes a compile time error.