
  

  :

     ( 5, 6 )     : 
1-        .
2-    set     get .
3-     (  )  ,   ,   .
4-     displayMessage      
     " this course presented by "   .

          .


  : 

     account       .      
   int   .       (  )     
            .         
        .      :

1-   credit    .
2-   debit         debit    ,   
,      ,     :"       ".
3-   getBalance     






  : 

  

                .
       Invoice ,      
  :
  -   string 
  -   string
   -   int
   -   int

     : 
1-      (  )         ( arguments ).
2-    invoiceAmount     (    )     int.
3-         .
4-         .

        .


  


    Employee ,           
   ...   string
   ..   string
  ....   int

     : 
1-     "   " ,         . 
2-     set   get   .
3-      ,   .

     ,     Employee       .
      10%      .












  

    Date        ,    :
 .....   int
 ......   int
 ......   int

     : 
1-     (   )        . 
2-                 
    ( 1- 12 )   .      ,     .
3-     set   get   .
4-           / .

        

