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Static class Vs Singleton Pattern ?
stackoverflow+difference-between-static-class-and-singleton-pattern

A singleton pattern is implemented through a static object.

Static is a class variable it is intialized only once...ordinary variables are object specific variables..each object will have its own copy of variables but it is not the case with Static variables..the same static variable is accessed by all the objects of the class(and so called class variable)...and the reason why we use static object variable in Singleton class so that whenever you try create object and since it is a static variable and holds the object reference we check it is NULL if not NULL we return the same reference by avoiding creation of multiple objects

Static is a class variable it is intialized only once...ordinary variables are object specific variables..each object will have its own copy of variables but it is not the case with Static variables..the same static variable is accessed by all the objects of the class(and so called class variable)...and the reason why we use static object variable in Singleton class so that whenever you try create object and since it is a static variable and holds the object reference we check it is NULL if not NULL we return the same reference by avoiding creation of multiple objects

Static is a class variable it is intialized only once...ordinary variables are object specific variables..each object will have its own copy of variables but it is not the case with Static variables..the same static variable is accessed by all the objects of the class(and so called class variable)...and the reason why we use static object variable in Singleton class so that whenever you try create object and since it is a static variable and holds the object reference we check it is NULL if not NULL we return the same reference by avoiding creation of multiple objects

'Test code'

Static is just a way to implement Singleton pattern. We need singleton pattern wherever we need just one instance of class. For example logger class.

printf("Hello Wrong World");