Member functions can be invoked only after the creation of objects where as constructors are automatically invoked while creating an object. Constructors used to construct an object i.e, initializing variables in an object during its creation.

Constructor is a special member function which is automatically initialized when the object of the class is created you don't need to call it.
if you r not using constructor then compiler automatically define
empty constructor for execution.
constructor name should be same as class name and it cannot return any value.
on the other hand simple member function should be called with the help object of class using period operator(eg obj1.show();)

constructor can be excute automatically whenever objects created.in the constructor we can initialize the values of the variables.
Member function can excute when we call the function through the object.

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