3.4 conditional If...Then...Else

3.4 conditional If...Then...Else
if..then..else used to process one statements or one block statements, depending value was tested.
sintax : 1

if<expressin> then <statements>;

or,
sintax : 2

if<expressin> then <statements1>else <statements2>;

<expressin>is logic expression. sintax 1, if will test his right <expression>. if <expression> value true, then statement or block statement in his right will be process. if <expression> value false, then statement or block statement in his right will not be process.
sintax 2 : if will test his <expression>. if <expression> value true, then statement or block statement in his right will be process. if <expression> value false, then statement or block statement in else right will be process.
as a examples :

//examples 1

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