Important

 1)Inlinefunction:

inline int function ( )=replace the whole function in main function for reduce complexity i.e remove return and call function but it work general function not user define function.

It is a request from compiler.

2)Static Variable(static int) =work only one time ,it is use for only  initialisation. 

3)Default value= a value which is used by function if user does not give value

      Ex :-int function (int a,int b=4)

Call function ( x  ) then automatically fnctn use b=4 in rslt and 

We provide function  (x ,y ) then use y in place b(4).

Uses: 1) use to different values for different purposes without assign two value of y.

4) Recursion: call again same function in function

5)to_string(int) = It convert int into string.