Iteration

iteration means repetition .iteration statenentys are the statemnents repedately execute one or more than one statement .these iterations are also called loops .

these loops are to execute a set of instructions until condition becomes false these loops are having following part. 

• Initialization:-  It defines loop variable 
• conditional expression (>,<,<=,>=,==,>>,<< etc ):- it is  a relational expression with or without logical operators 
• update expression (increment and decrement opreators ):- this expression changes the value of loop variable it is executed at the end of each iteration
• the body of loop  

there are three kinds of loop :

• For loop :-    it executes the statements or sets of statements repeadetly until the conditional expression becomes false . the genral syntax for FOR loop :
  
                             
• While : it is also called entry -controller loop this loop is written as   :                           
  

• Do-while  :

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